In review or revision

Djokic, T, Van Kranendonk, MJ, Satkoski, AM, Johnson, CM, Stellar, L, and Garber, U. A Paleoarchean hydrogen-based ecosystem: Evidence from terrestrial microdigitate stromatolites of the 3.5 Ga Dresser Formation, Pilbara Craton, Australia. Geobiology, in revision.

Schaen, AJ, Singer, BS, Cottle, JM, Garibaldi, N, Schoene, B, Satkoski, AM, and Fournelle, J. Textural and mineralogical record of melt extraction and silicic cumulate formation in a young epizonal Andean pluton. Jour. Petrology, in revision.


  1. Frierdich, AJ, Nebel, O, Beard, BL, and Johnson, CM. Iron isotope exchange and fractionation between hematite and aqueous Fe(II): A combined three-Isotope and reversal-approach to equilibrium study. Geochim. Cosmochim. Acta, in press.
  1. Williams, RT, Beard, BL, Goodwin, LB, Sharp, WD, Johnson, CM, and Mozley, PS (2018) Radiogenic isotopes record a ‘drop in a bucket’ – a fingerprint of multi-kilometer-scale fluid pathways inferred to drive fault-valve behavior. Jour. Struct. Geol., in press.
  1. Johnson, CM, and Van Kranendonk, MJ (2018) Plate tectonics and evolution of early life. In Kolb, V (ed) Handbook of Astrobiology. CRC Press, in press.
  1. Czaja, AD, Van Kranendonk, MJ, Beard, BL, and Johnson, CM (2018) A multistage origin for Neoarchean layered hematite-magnetite iron formation from the Weld Range, Yilgarn Craton, Western Australia. Chemical Geology 488:125-137. PDF
  1. Levitt, NP, Eiler, JM, Romanek, CS, Beard, BL, Xu, H, and Johnson, CM (2018) Near equilibrium 13C-18O bonding during inorganic calcite preciptiation under chemo-stat conditions. Geochem. Geophys., Geosys, doi:10.1002/2017GC007089. PDF
  1. Haroldson, E, Beard, B, Satkoski, A, Brown, P, and Johnson, C (2018) Gold mineralization associated with MVT fluids using in-situ Pb isotopes. Geol. Soc. Amer. Bull., doi:10.1130/B31901.1. PDF
  1. Zheng, X-Y, Beard, BL, and Johnson, CM (2018) Assessment of matrix effects associated with Fe isotope analysis using 266 nm femtosecond and 193 nm nanosecond laser ablation multi-collector inductively coupled plasma mass spectrometry. Jour. Analyt. Atom. Spect. 33:68-83. PDF


  1. Li W, Kwon KD, Li S, and Beard BL (2017) Potassium isotope fractionation between K-salts and saturated aqueous solutions at room temperature: Laboratory experiments and theoretical calculations. Geochmicia et Cosmochimica Acta 214:1-13. PDF
  1. Johnson, CM (2017) Iron Formations. In: W.M. White (ed.), Encyclopedia of Geochemistry, Springer. DOI 10.1007/978-3-319-39193-9_58-1. PDF
  1. Konhauser, KO, Robbins, LJ, Warchola, TJ, Haugaard, R, Planavsky, NJ, Hardisty, DS, Lalonde, SV, Partin, CA, Oonk, PBH, Tsikos, H, Lyons, TW, Bekker, A, and Johnson, CM (2017) Iron Formations: A Record of Neoarchean to Paleoproterozoic Environmental History. Earth. Sci. Rev. 172:140-177. PDF
  1. Smith, AJB, Beukes, NJ, Gutzmer, J, Czaja, AD, and Johnson, CM (2017) Oncoidal granular iron formation in the Mesoarchean Pongola Supergroup, southern Africa: Textural and geochemical evidence for biological activity during iron deposition. Geobiology 2017:1-19. PDF
  1. Baddouh, M, Carroll, AR, Meyers, SR, Beard, BL, and Johnson, CM (2017) Chronostratigraphic correlation of lacustrine deposits using 87Sr/86Sr ratios, Eocene Green River Formation, WY. Jour. Sed. Res. 87:406-423. PDF
  1. Ankney, ME, Bacon, CR, Valley, JW, Beard, BL, and Johnson, CM (2017) Oxygen and U-Th isotopes and the timescales of hydrothermal exchange and melting in granitoid wall rocks at Mount Mazama, Crater Lake, Oregon. Geochim. Cosmochim. Acta 213:137-154. PDF
  1. Satkoski, AM, Fralick, P, Beard, BL, and Johnson, CM (2017) Initiation of modern-style plate tectonics recorded in Mesoarchean marine chemical sediments. Geochim. Cosmochim. Acta 209:216-232. PDF
  1. Andersen, NL, Singer, BL, Jicha, BR, Beard, BL, Johnson, CM, and Licciardi, JM (2017) Pleistocene to Holocene growth of a large upper crustal rhyolitic magma reservoir beneath the active Laguna del Maule volcanic field, central Chile. Jour. Petrol. 58:85-114. PDF
  1. Zheng, X.Y., Beard, B.L., Lee, S.Y., Reddy, T.R., Xu, H.F., Johnson, C.M. (2017) Contrasting particle size distributions and Fe isotope fractionations during nanosecond and femtosecond laser ablation of Fe minerals: Implications for LA-MC-ICP-MS analysis of stable isotopes. Chemical Geology, Vol. 450, 235-247. PDF
  1. Lapen, T.J., Righter, M., Andreasen, R., Irving, A.J., Satkoski, A.M., Beard, B.L., Nishizumi, K.,  Jull, A.J.T., Caffee, M.W., (2017) Two Billion Years of Magmatism Recorded from a Single Mars Meteorite Ejection Site. Science Advances, Vol. 3, no. 2, e1600922. PDF


  1. Hatfield RG, Reyes AV, Stoner JS, Carlson AE, Beard BL, Winsor K and Welke B (2016) Interglacial responses of the southern Greenland ice sheet over the last 430,000 years determined using particle-size specific magnetic and isotopic tracers. Earth and Planetary Science Letters 454: 225-236. PDF
  1. Satkoski, A, Lowe, DR, Beard, BL, Coleman, ML, and Johnson, CM (2016) A high continental weathering flux into Paleoarchean seawater revealed by strontium isotope analysis of 3.26 Ga barite. Earth and Planetary Science Letters 454: 28-35. PDF
  1. Reddy, TR, Zheng, X-Y, Roden, EE, Beard, BL, Johnson, CM (2016) Silicon isotope fractionation during microbial reduction of Fe(III)-Si gels under Archean seawater conditions and implications for iron formation genesis. Geochim. Cosmochim. Acta 190:85-99. PDF
  1. Zheng, X-Y, Beard, BL, Reddy, TR, Roden, EE, and Johnson, CM (2016) Abiologic silicon isotope fractionation between aqueous Si and Fe(III)-Si gel in simulated Archean seawater: Implications for Si isotope records in Precambrian sedimentary rocks. Geochim. Cosmochim. Acta 187:102-122. PDF
  1. Shi, B, Liu, K, Wu, L, Li, W, Smeaton, CM, Beard, BL, Johnson, CM, Roden, EE, and Van Cappellen, P (2016) Iron isotope fractionations reveal a finite bioavailable Fe pool for structural Fe(III) reduction in nontronite. Environ. Sci. Technol. 50:8661-8669.  PDF
  1. Baddouh, M, Meyers, SR, Carroll, AR, Beard, BL, and Johnson, CM (2016) Lacustrine 87Sr/86Sr as a tracer to reconstruct Milankovitch forcing of the Eocene hydrologic cycle. Earth Planet. Sci. Lett. 448:62-68. PDF
  1. Fortney, NW, Converse, BJ, He, S, Beard, BL, Johnson, CM, Boyd, ES, and Roden, EE (2016) Microbial Fe(III) oxide reduction potential in Chocolate Pots hot spring, Yellowstone National Park. Geobiology 14:255-275. PDF
  1. Li, W, Beard, BL, and Li, S (2016) Precise measurement of stable Potassium isotope ratios using a single focusing collision cell Multi-Collector ICP-MS, Journal Analytical Atomic Spectroscopy 31:1023-1029. PDF
  1. Ankney, ME, Shirey, SB, Hart, G, Bacon, CR, and Johnson, CM (2016) Os and U-Th isotope signatures of arc magmatism near Mount Mazama, Crater Lake, Oregon. Earth Planet. Sci. Lett. 437:25-34. PDF


  1. Liu, K, Wu, L, Couture, R-M, Li, W, and Van Cappellan (2015) Iron isotope fractionation in sediments of an oligotrophic freshwater lake. Earth Planet. Sci. Let. 423:164-172. PDF
  1. Satkoski, A, Beukes, NJ, Li, W, Beard, BL, and Johnson, CM (2015) A redox-stratified ocean 3.2 billion years ago. Earth Planet. Sci. Lett. 430:43-53. PDF Supplementary Material is here.
  1. Wende, A, Johnson, CM, and Beard, BL (2015) Identifying distinct mantle and crustal influences in individual cone-building stages at Mt. Shasta using U-Th and Sr isotopes. Earth Planet. Sci. Lett. 428:11-21. PDF
  1. Williams, RT, Goodwin, LB, Mozley, PS, Beard, BL, and Johnson, CM (2015) Tectonic controls on fault zone flow pathways in the Rio Grande rift, New Mexico, USA. Geology 43:723-726. PDF
  1. Skora, S, Mahlen, N, Johnson, C, Baumgartner, L, Lapen, T, Beard, B, and Szilvagi, E. (2015) Evidence for protracted prograde metamorphism followed by rapid exhumation of the Zermatt-Saas ophiolite. Jour. Metamorphic Geol. 33:711-734. PDF
  1. Li, W, Beard, BL, and Johnson, CM (2015) Biologically-recycled continental iron: a major component in Banded Iron Formations. Proc. Nat. Academ. Sci. Proc. Nat. Acad. Sci. 112:8193-8198. PDF Supplementary Material is here.
  1. Frierdich, AJ, Beard, BL, Rosso, KM, Scherer, MM, Spicuzza, MJ, Valley, JW, and Johnson, CM (2015) Low temperature, non-stoichiometric oxygen isotope exchange coupled to Fe(II)-goethite interactions. Geochim. Cosmochim. Acta. 160:38-54. PDF
  1. Li, W, Beard, BL, Li, C, Xu, H, and Johnson, CM (2015) Experimental calibration of Mg isotope fractionation between dolomite and aqueous solution and its geological implications. Geochim. Cosmochim. Acta. 164-181. PDF
  1. Neumann, A, Wu, L, Li, W, Beard, BL, Johnson, CM, Rosso, KM, Frierdich, AJ, and Scherer, MM (2015) Atom exchange between aqueous Fe(II) and structural Fe in clay minerals. Environ. Sci. & Technol. 49:2786-2795. PDF
  1. Reddy, TR, Frierdich, AJ, Beard, BL, and Johnson, CM (2015) The effect of pH on stable iron isotope exchange and fractionation between aqueous Fe(II) and goethite. Chem. Geol. 397:118-127. PDF


  1. Reyes, AV, Carlson, AE, Beard, BL, Hatfield, RG, Stoner, JS, Winsor, K, Welke, B, and Ullman, DJ (2014) South Greenland ice-sheet collapse during Marine Isotope Stage 11. Nature 510:525-528. PDF
  1. Handler, RM, Frierdich, AJ, Johnson, CM, Rosso, KM, Beard, BL, Wang, C, Latta, DE, Neumann, A, Pasakarnis, T, Premarante, WAPJ, and Scherer, MM (2014) Fe(II)-catalyzed recrystallization of goethite revisited. Environ. Sci. & Technol. 48:11302-11311. PDF
  1. d’Abzac, F-X, Czaja, AD, Beard, BL, Schauer, JJ, and Johnson, CM (2014) Iron distribution in size-resolved aerosols generated by UV-femtosecond laser ablation: Influence of cell geometry and implications for in situ isotopic analysis by LA-MC-ICP-MS. Geostand. Geoanal. Res. 38:293-309. PDF
  1. Doebbert, AC, Johnson, CM, Carroll, AR, Beard, B, Pietras, J, Rhodes-Carson, M, Norsted, B, and Throckmorton, LA (2014) Controls on Sr isotopic evolution in lacustrine systems: Eocene Green River Formation, Wyoming. Chem. Geol. 380:172-189. PDF
  1. Frierdich, AJ, Beard, BL, Reddy, TR, Scherer, MM, and Johnson, CM (2014) Iron isotope fractionation between aqueous Fe(II) and goethite revisted: New insights based on a multi-direction approach to equilibrium and isotopic exchange rate modification. Geochim. Cosmochim. Acta 139:383-398. PDF
  1. de Meyer, C, Baumgartner, LP, Beard, BL, and Johnson, CM (2014) Rb-Sr ages from phengite inclusions in garnets from high pressure rocks of the Swiss Western Alps. Earth. Planet. Sci. Lett. 395:205-216. PDF
  1. Li, W, Beard, BL, and Johnson, CM (2014) Magnesium isotope fractionation between brucite [Mg(OH)2] and Mg aqueous species: Implications for silicate weathering and biogeochemical processes. Earth Planet. Sci. Lett 394:82-93. PDF
  1. Frierdich, AJ, Beard, BL, Scherer, MM, and Johnson, CM (2014) Determination of the Fe(II)aq-magnetite equilibrium iron isotope fractionation factor using the three-isotope method and a multi-direction approach to equilibrium. Earth Planet. Sci. Lett. 391:77-86. PDF
  1. Singer, BS, Jicha, BR, Fournelle, JH, Beard, BL, Johnson, CM, Smith, KE, Greene, SE, Kita, N, Valley, JW, Spicuzza, M, and Rogers, N (2014) Lying in wait: Deep and shallow evolution of dacite beneath Volcán Santa Maria, Guatemala. In: Gomez-Tuena A., Straub S.M., Zellmer G.F. (eds) Orogenic andesites and crustal growth. Geological Society, London, Special Publications, 385:209-234. PDF


  1. Medaris, GL Jr, Jelínek, E, Beard, BL, Valley, JW, Spicuzza, MJ, and Strnad, L (2013) Garnet pyroxenite in the Biskupice peridotite, Bohemian Massif: anatomy of a Variscan high-pressure cumulate. Jour. GEOsciences 58:3-19. PDF
  1. Li, W, Huberty, J, Beard, B, Valley, J, and Johnson, C (2013) Contrasting behavior of oxygen and iron isotopes in banded iron formations as determined by in situ isotopic analysis. Earth. Planet. Sci. Lett 384:132-143. PDF
  1. Wu, L, Poulson-Brucker, R, Beard, BL, Roden, EE, and Johnson, CM (2013) Iron isotope characteristics of hot springs at Chocolate Pots, Yellowstone National Park. Astrobiology 13:1091-1101. PDF
  1. d’Abzac, F-X, Beard, BL, Czaja, AD, Konishi, H, Schauer, JJ, and Johnson, CM (2013) Iron isotope composition of particles produced by UV-femtosecond laser ablation of natural oxides, sulfides, and carbonates. Analytical Chem. 85:11885-11892. PDF
  1. Percak-Dennett, E, Loizeau, J-L, Beard, B, Johnson, C, and Roden, E (2013) Iron isotope geochemistry of biogenic magnetite-bearing sediments from the Bay of Vidy, Lake Geneva. Chem. Geol. 360/361:32-40. PDF
  1. Johnson, CM, Ludois, JM, Beard, BL, Beukes, NJ, and Heimann, A (2013) Iron formation carbonates: Paleoceanographic proxy or recorder of microbial diagenesis? Geology 41:1147-1150. PDF
  1. Li, W, Czaja, AD, Van Kranendonk, MJ, Beard, BL, Roden, EE, and Johnson, CM (2013) An anoxic, Fe(II)-rich, U-poor ocean 3.46 billion years ago. Geochim. Cosmochim. Acta 120:65-79. PDF
  1. Ankney, ME, Johnson, CM, Bacon, CR, Beard, BL, and Jicha, BR (2013) Distinguishing lower- and upper-crustal processes in magmas erupted during the build-up to the 7.7 ka climactic eruption of Mount Mazama, Crater Lake, Oregon, using 238U-230Th disequilibria. Contrib. Mineral. Petrol. 166:563–585. PDF
  1. Johnson, CM, McLennan, SM, McSween, HY, and Summons, RE (2013) Smaller, better, more: Five decades of advances in geochemistry. In, Bickford, ME, ed, The Web of Geological Sciences: Advances, Impacts, and Interactions: Geological Society of America Special Paper 500, p. 259-302. PDF
  1. Czaja, AD, Johnson, CM, Beard, BL, Roden, EE, Li, W, and Moorbath, S (2013) Biological Fe oxidation controlled deposition of banded iron formation in the ca. 3770 Ma Isua Supracrustal Belt (West Greenland). Earth Planet. Sci. Lett. 363:192-203. PDF
  1. Beard, BL, Ludois, JM, Lapen, TJ, and Johnson, CM (2013) Pre-4.0 billion year weathering on Mars constrained by Rb–Sr geochronology on meteorite ALH84001. Earth Planet. Sci. Lett. 361:173-182. PDF


  1. Gorski, CA, Handler, RM, Beard, BL, Pasakarnis, T, Johnson, CM, and Scherer, MM (2012) Fe atom exchange between aqueous Fe2+ and magnetite. Environ. Sci. Technol. 46:12399-12407. PDF
  1. Wu, L, Druschel, G, Findlay, A, Beard, BL, and Johnson, CM (2012) Experimental Determination of Iron Isotope Fractionations among Fe2+aq-FeSaq-Mackinawite at Low Temperatures: Implications for the Rock Record. Geochim. Cosmochim. Acta 89:46-61. PDF
  1. Li, W, Chakraborty, S, Beard, BL, Romanek, CS, and Johnson, CM (2012) Magnesium isotope fractionation during precipitation of inorganic calcite under laboratory conditions. Earth Planetary Sci. Lett. 333-334:304-316. PDF
  1. Czaja, AD, Johnson, CM, Roden, EE, Beard, BL, Voegelin, AR, Nägler, TF, Beukes, NJ, and Wille, M (2012) Evidence for free oxygen in the Neoarchean ocean based on coupled iron–molybdenum isotope fractionation. Geochim. Cosmochim. Acta 86:118-137. PDF
  1. Wu, L, Percak-Dennett, EM, Beard, BL, Roden, EE, and Johnson, CM (2012) Stable iron isotope fractionation between aqueous Fe(II) and model Archean ocean Fe-Si coprecipitates and implications for iron isotope variations in the ancient rock record. Geochim. Cosmochim. Acta. 84:14-28. PDF
  1. Li, W, Beard, BL, and Johnson, CM (2012) U-Th-Pb isotope data indicate Phanerozoic age for oxidation of 3.4 Ga basalts from Marble Bar, Pilbara Craton, NW Australia. Earth Planet. Sci. Lett 319-320:197-206. PDF
  1. Czaja, AD, Johnson, CM, Yamaguchi, KE, and Beard, BL (2012) Technical comment on “Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation” by Guilbaud et al. (2011). Science 335:538-c. PDF


  1. Sinha, M.P., Neidholdt, E.L., Hurowitz, J., Sturhahn,W., Beard, B., Hecht, M.H. (2011) Laser ablation-miniature mass spectrometer for elemental and isotopic analysis of rocks. Rev. Sci. Instrum. 82, 094102 (2011); doi: 10.1063/1.3626794. PDF
  1. Colville, E.J., Carlson, A.E., Beard, B.L., Hatfield, R.G., Stoner, J.S., Reyes, A.V., Ullman, D.J. (2011) Sr-Nd-Pb Isotope Evidence for Ice-Sheet Presence on Southern Greenland during the Last Interglacial. Science 333:620-623. PDF
  1. Jicha, BR, Kristjánsson, L, Brown, MC, Singer, BS, Beard, BL, and Johnson, CM (2011) New age for the Skálamælifell excursion and identification of a global geomagnetic event in the late Brunhes chron. Earth Planet. Sci. Lett. 310:509-517. PDF
  1. Singer, BS, Smith, KE, Jicha, BR, Beard, BL, Johnson, CM, and Rogers, NW (2011) Tracking open-system differentiation during growth of Santa María volcano, Guatemala. Jour. Petrol. 52:2335-2363. PDF
  1. Percak-Dennett, L, Roden, EE, Beard, BL, and Johnson, CM (2011) Iron isotope fractionation during dissimilatory iron reduction under simulated Archean conditions. Geobiology 9:205-220. PDF
  1. Wu, L, Beard, BL, Roden, BL, and Johnson, CM. Stable iron isotope fractionation between aqueous Fe(II) and hydrous ferric oxide (2011) Environ. Sci. Technol. 45:1847-1852. PDF
  1. Li, W, Beard, BL, and Johnson, CM. Exchange and fractionation of Mg isotopes between epsomite and saturated MgSO4 solution (2011) Geochim. Cosmochim. Acta. 75:1814-1828. PDF
  1. Kita, NT, Huberty, JM, Kozdon, R, Beard, BL, and Valley, JW (2011) High-precision SIMS oxygen, sulfur and iron stable isotope analyses of geological materials: accuracy, surface topography and crystal orientation. Surf. Int. Analysis 43:427-431. PDF
  1. Chetel, LM, Janecke, SU, Carroll, AR, Beard, BL, Johnson, CM, and Singer, BS (2011) Paleogeographic reconstruction of the Eocene Idaho River, North American Cordillera. Geol. Soc. Amer. Bull. 123:71-88. PDF


  1. Shafer, JT, Brandon, AD, Lapen, TJ, Righter, M, Peslier, AH, and Beard, BL (2010) Trace element systematics and 147Sm–143Nd and 176Lu–176Hf ages of Larkman Nunatak 06319: Closed-system fractional crystallization of an enriched shergottite magma. Geochim. Cosmochim. Acta 74:7307-7328. PDF
  1. Hora, JM, Singer, BS, Jicha, BR, Beard, BL, Johnson, CM, de Silva, S, and Salisbury, M (2010) Biotite-sanidine 40Ar/39Ar age discordances reflect complex Ar partitioning and pre-eruption closure in biotite. Geology 38:923-926. PDF
  1. Jicha, BR, Smith, KE, Singer, BS, Beard, BL, Johnson, CM, and Rogers, NW (2010) Crustal assimilation no match for slab-fluids beneath Volcan de Sante Maria, Guatemala. Geology 38:859–862. PDF
  1. Wu, L, Beard, BL, Roden, EE, Kennedy, CB, and Johnson, CM (2010) Stable Fe isotope fractionations produced by aqueous Fe(II)-hematite surface interactions. Geochim. Cosmochim. Acta 74:4249-4265. PDF
  1. Doebbert, AC, Carroll, AR, Mulch, A, Chetel, LM, and Chamberlain, CP (2010) Geomorphic controls on lacustrine isotopic compositions: Evidence from the Laney member, Green River Formation, Wyoming. Geol. Soc. Amer. Bull. 122:236-252. PDF
  1. Beard, BL, Handler, RM, Scherer, MM, Wu, L, Czaja, AD, Heimann, A, and Johnson, CM (2010) Iron isotope fractionation between aqueous ferrous iron and goethite. Earth Planet. Sci. Lett. 295:241-250. PDF
  1. Lapen, TJ, Righter, M, Brandon, AD, Debaille, V, Beard, BL, Shafer, JT, and Peslier, AH (2010) A younger age for ALH84001 and its geochemical link to shergottite sources in Mars. Science 328:347-351. PDF
  1. Tangalos, GE, Beard, BL, Johnson, CM, Alpers, CN, Shelobolina, ES, Xu, H, Konishi, H, and Roden, EE (2010) Microbial production of isotopically light iron(II) in a modern chemically-precipitated sediment and implications for isotopic variations in ancient rocks. Geobiology 8:197-208. PDF
  1. Heimann, A, Johnson, CM, Beard, BL, Valley, JW, Roden, EE, Spicuzza, MJ, and Beukes, NJ (2010) Fe, C, and O isotope compositions of banded iron formation carbonates demonstrate a major role for dissimilatory iron reduction in ~ 2.5 Ga marine environments. Earth Planet. Sci. Lett. 294:8-18. PDF
  1. Kappler, A, Johnson, CM, Crosby, HA, Beard,BL, and Newman, DL (2010) Evidence for equilibrium iron isotope fractionation by nitrate-reducing iron(II)-oxidizing bacteria. Geochim. Cosmochim. Acta 74:2826-2842 PDF
  1. Czaja, AD, Johnson, CM, Beard, BL, Eigenbrode, JL, Freeman, KH, and Yamaguchi, KE (2010) Iron and carbon isotope evidence for ecosystem and environmental diversity in the ~2.7 to 2.5 Ga Hamersley Province, Western Australia. Earth Planet. Sci. Lett. 292:170-180. PDF
  1. Johnson, CM, Bell, K, Beard, BL, and Shultis, AI (2010) Iron isotope compositions of carbonatites record melt generation, crystallization, and late-stage volatile-transport processes. Mineralogy and Petrology 98:91-110. PDF


  1. Skora, S, Lapen, TJ, Baumgartner, LP, Johnson, CM, Hellenbrand, E, and Mahlen, NJ (2009) The duration of prograde garnet crystallization in the UHP eclogites at Lago di Cignana, Italy. Earth Planet. Sci. Lett. 287:402-411. PDF
  1. Brandon, AD, Lapen, TJ, DeBaille, V, Beard, BL, Rankenburg, K, and Neal, C (2009) Re-evaluating 142Nd/144Nd in Lunar Mare basalts with implications for the early evolution and bulk Sm/Nd of the Moon. Geochim. Cosmochim. Acta 73:6421-6445. PDF
  1. Singer, BS, Guillou, H, Jicha, BR, Laj, C, Kissel, C, Beard, BL, and Johnson, CM (2009) 40Ar/39Ar, K-Ar and 230Th-238U dating of the Laschamp excursion: A radioisotopic tie-point for ice core and climate chronologies. Earth Planet. Sci. Lett. 286:80-88. PDF
  1. Wu, L, Beard, BL, Roden, EE, and Johnson, CM (2009) Influence of pH and dissolved Si on Fe isotope fractionation during dissimilatory microbial reduction of hematite. Geochim. Cosmochim. Acta 73:5584-5599. PDF
  1. Hora, JM, Singer, BS, Worner, G, Beard, BL, Jicha, BR, and Johnson, CM (2009) Shallow and deep crustal control on differentiation of calc-alkaline and tholeiitic magma. Earth Planet. Sci. Lett. 285:75-86. PDF
  1. Lapen, TJ, Medaris, LG Jr, Beard, BL, and Johnson, CM (2009) The Sandvik peridotite, Gurskøy, Norway: Three billion years of mantle evolution in the Baltica lithosphere. Lithos 109:145-154. PDF
  1. Kylander-Clark, ARC, Hacker, BR, Johnson, CM, Beard, BL, and Mahlen, NJ (2009) Slow subduction of a thick ultrahigh-pressure terrane. Tectonics 28: doi:10.1029/2007TC002251, 10 March 2009. PDF
  1. Handler, RM, Beard, BL, Johnson, CM, and Scherer, MM (2009) Atom exchange between aqueous Fe(II) and goethite: An Fe isotope tracer study. Environ. Sci. Technol. 43:1102-1107. PDF
  1. Jicha, BR, Johnson, CM, Hildreth, W, Beard, BL, Hart, GL, Shirey, SB, and Singer, BS (2009) Discriminating assimilants and decoupling deep- vs. shallow-level crystal records at Mount Adams using 238U-230Th disequilibria and Os isotopes. Earth Planet. Sci. Lett. 277:38-49. PDF
  1. Jicha, BR, Hart, GL, Johnson, CM, Hildreth, W, Beard, BL, Shirey, SB, and Valley, JW (2009) Isotopic and Trace Element Constraints on the Petrogenesis of Lavas from the Mount Adams Volcanic Field, Washington. Contrib. Mineral. Petrol. 157:189-207. PDF


  1. Carroll, AR, Doebbert, AC, Booth, AL, Chamberlain, CP, Rhodes-Carson, MK, Smith, ME, Johnson, CM, and Beard, BL (2008) Capture of high altitude precipitation by a low altitude Eocene lake, western U.S. Geology 36:791-794. PDF
  1. Heimann, A, Beard, BL, and Johnson, CM (2008) The role of volatile exsolution and sub-solidus fluid/rock interactions in producing high 56Fe/54Fe ratios in siliceous igneous rocks. Geochim. Cosmochim. Acta 72:4379-4396. PDF
  1. Skora, S, Baumgartner, LP, Mahlen, NJ, Lapen, TJ, Johnson, CM, and Bussy, F (2008) Estimation of a maximum Lu diffusion rate in a natural eclogite garnet. Swiss Jour. Geosci. DOI 10.1007/s00015-008-1268-y. PDF
  1. Johnson, CM, Beard, BL, and Roden, EE (2008) The iron isotope fingerprints of redox biogeochemical cycling in modern and ancient Earth. Ann. Rev. Earth Planet. Sci. 36:457-493. PDF
  1. Mahlen, NJ, Beard, BL, Johnson, CM, Lapen, TJ (2008) An investigation of dissolution methods for Lu-Hf and Sm-Nd isotope studies in zircon- and garnet-bearing whole-rock samples. Geochemistry, Geophysics, and Geosystems (G3) 9, Q01002, doi:10.1029/2007GC001605 12 January 2008. PDF
  1. Valaas-Hyslop, E, Valley, JW, Johnson, CM, and Beard, BL (2008) The effects of metamorphism on O and Fe isotope compositions in the Biwabik iron-formation, northern Minnesota. Contrib. Mineral. Petrol. 155:313-328. [PDF] Sup. Material. PDF
  1. Johnson, CM, Beard, BL, Klein, C, Beukes, NJ, and Roden, EE (2008) Iron isotopes constrain biologic and abiologic processes in banded iron formation genesis. Geochim. Cosmochim. Acta 72:151-169. PDF


  1. Ackerman, L, Mahlen, N, Jelinek, E, Medaris, G Jr, Ulrych, J, Strnad, L, Mihaljevic, M (2007) Geochemistry and evolution of subcontinental lithospheric mantle in central Europe: Evidence from peridotite xenoliths of the Kozkov volcano, Czech Republic. Jour. Petrol. 48:2235-2260 DEC. PDF
  1. Kylander-Clark, ARC, Hacker, BR, Johnson, CM, Beard, BL, Mahlen, NJ, and Lapen, TJ (2007) Coupled Lu-Hf and Sm-Nd geochronology constrains prograde and exhumation histories of high- and ultrahigh-pressure eclogites from western Norway. Chem. Geol. 242:137-154. PDF
  1. Crosby, HA, Roden, EE, Johnson, CM, and Beard, BL (2007) The mechanisms of iron isotope fractionation produced during dissimilatory Fe(III) reduction by Shewanella putrefaciens and Geobacter sulfurreducens. Geobiology 5:169-189. PDF
  1. King, EM, Beard, BL, and Valley, JW (2007) Strontium and oxygen isotopic evidence for strike/slip movement of accreted terranes in the Idaho Batholith. Lithos 96:387-401. PDF
  1. Comment-Rely: Beard, BL, and Johnson, CM. (2007) Comment on “Iron isotope fractionation during planetary differentiation” by S. Weyer et al., Earth Planet. Sci. Letts. 256:633-637; Weyer, S, Anbar, AD, Brey, GP, Münker, C, Mezger, K, and Woodland, AB (2007) Fe-isotope fractionation during partial melting on Earth and the current view on the Fe-isotope budgets of the planets (Reply to the comment of F. Poitrasson and to the comment of B.L. Bead and C.M. Johnson) 256:638-646. PDF
  1. Yamaguchi, KE, Johnson, CM, Beard, BL, Beukes, NJ, Gutzmer, J, and Ohmoto, H. (2007) Isotopic evidence for iron mobilization during Paleoproterozoic lateritization of the Hekpoort paleosol profile from Gaborone, Botswana. Earth Planet. Sci. Letts. 256:577-587. PDF
  1. Jicha, BR, Singer, BS, Beard, BL, Johnson, CM, Roa, HM, and Naranjo, J.A. (2007) Rapid magma ascent and generation of 230Th excesses in the lower crust at Puyehue-Cordón Caulle, Southern Volcanic Zone, Chile. Earth Planet. Sci. Letts. 255:229-242. PDF
  1. Lapen, TJ, Johnson, CM, Baumgartner, LP, Dal Piaz, GV, Skora, S, and Beard, BL (2007) Coupling of oceanic and continental crust during Eocene eclogite-facies metamorphism: Evidence from the Monte Rosa nappe, western Alps. Contrib. Mineral. Petrol. 153:139-157. PDF
  1. Wiesli, RA, Beard, BL, Braterman, PS, Johnson, CM, Saha, SK, and Sinha, MP (2007) Iron Isotope Fractionation Between Liquid and Vapor Phases of Iron Pentacarbonyl. Talanta 71:90-96. PDF


  1. Chan, MA, Johnson, CM, Beard, BL, Bowman, JR, and Parry, WT (2006). Iron isotopes constrain the pathways and formation mechanisms of terrestrial oxide concretions: A tool for tracing iron cycling on Mars? Geosphere 2:324-332. Main paper [PDF] Supp. Material. PDF
  1. Johnson, CM, and Beard, BL (2006) Fe isotopes: an emerging technique in understanding modern and ancient biogeochemical cycles. GSA Today 16:4-10. PDF
  1. Medaris, LG, Beard, BL, and Jelinek, E (2006) Mantle-derived, UHP garnet pyroxenite and eclogite in the Moldanubian Gfohl nappe, Bohemian Massif: A geochemical review, new P-T determinations, and tectonic interpretation. Int. Geol. Rev. 48:765-777. PDF
  1. Skora, S, Baumgartner, LP, Mahlen, NJ, Johnson, CM, Pilet, S, and Hellebrand, E (2006). Diffusion-limited REE uptake by eclogite garnets and its consequences for Lu-Hf and Sm-Nd geochronology. Contrib. Mineral. Petrol.152:703-720. PDF
  1. Comment-Reply: Beard, BL, and Johnson, CM (2006). Comment on “Heavy iron isotope composition of granites determined by high resolution MC-ICP-MS”, by F. Poitrasson and R. Freydier, Chemical Geology, volume 222, pages 132-147. Chem. Geol. 235:201-204. Poitrasson, F. On the iron isotope homogeneity level of the continental crust – A Reply. Chem. Geol. 235:195-200. PDF
  1. Sharaf, EF, BouDagher-Fadel, MK, Simo, JA, and Carroll, AR (2006) Biostratigraphy and strontium isotope dating of Oligocene-Miocene strata, East Java, Indonesia. Stratigraphy 2:239-258. PDF
  1. Chu, N-C, Johnson, CM, Beard, BL, German, CR, Nesbitt, RW, Frank, M, Bohn, M, Kubik, PW, Usui, A, and Graham, I (2006) Evidence for hydrothermal venting in the Fe isotope compositions of deep Pacific Ocean through time. Earth Planet. Sci. Lett. 245:202-217. PDF
  1. Severmann, S, Johnson, CM, Beard, BL, and McManus, J (2006) The effect of early diagenesis on the Fe isotope compositions of porewaters and authigenic minerals in continental margin sediments. Geochim. Cosmochim. Acta 70:2006-2022. PDF


  1. Lapen, TJ, Medaris, LG Jr, Johnson, CM, and Beard, BL (2005) Archean to Middle Proterozoic evolution of Baltica subcontinental lithosphere: evidence from combined Sm-Nd and Lu-Hf isotope analyses of the Sandvik ultramafic body, Norway. Contrib. Mineral. Petrol. 150:131-145. PDF
  1. Crosby, HA, Johnson, CM, Roden, EE, and Beard, BL (2005) Coupled Fe(II)-Fe(III) electron and atom exchange as a mechanism for Fe isotope fractionation during dissimilatory iron oxide reduction. Environ. Sci. Technol. 39:6698-6704. PDF
  1. Johnson, CM and Beard, BL (2005) Biogeochemical cycling of iron isotopes. Science 309:1025-1027. PDF
  1. Jicha, BR, Singer, BS, Beard, BL, and Johnson, CM (2005) Contrasting timescales of crystallization and magma storage beneath the Aleutian Island arc. Earth Planet. Sci. Lett. Letters 236:195-210. PDF
  1. Yamaguchi, KE, Johnson, CM, Beard, BL, and Ohmoto, H (2005) Biogeochemical cycling of iron in the Archean-Paleoproterozoic Earth: Constraints from iron isotope variations in sedimentary rocks from the Kaapvaal and Pilbara Cratons, Spec. Issue on Isotopic Biosignatures, Chem. Geol. 218:135-169. PDF
  1. Poulson, RL, Johnson, CM, and Beard, BL (2005) Evidence of Fe isotope exchange at the nanoparticulate ferrihydrite surface. Amer Mineral. 90:758-763. PDF
  1. Mahlen, NJ, Johnson, CM, Baumgartner, LP, and Beard, BL (2005) Provenance of Jurassic Tethyan sediments in the HP/UHP Zermatt-Saas Ophiolite, Western Alps. Bull. Geol. Soc. Amer. 117:530–544. PDF
  1. Johnson, CM, Roden, EE, Welch, SA, and Beard, BL (2005) Experimental constraints on Fe isotope fractionation during magnetite and Fe carbonate formation coupled to dissimilatory hydrous ferric oxide reduction. Geochim. Cosmochim. Acta 69: 963-993. Main paper: PDFElectronic Appendix EA-1 (Details on Methods): PDFElectronic Appendix EA-2 (SEM and TEM images of run products): PDF
  1. Comment-Rely: Medaris, LG, Jr, Singer, BS, Dott, RH, Jr, Johnson, CM (2005) Detrital Zircon Ages from Early Proterozoic Quartzites, Wisconsin, Support Rapid Weathering and Deposition of Mature Quartz Arenites: A Discussion. Journal Geology 113:233–234. Van Wyck, N and Norman, M (2005) Detrital Zircon Ages from Early Proterozoic Quartzites, Wisconsin, Support Rapid Weathering and Deposition of Mature Quartz Arenites: A Reply. Journal Geology 113:235–236. PDF


  1. Beard, BL and Johnson, CM (2004) Inter-mineral Fe isotope variations in mantle derived rocks and implications for the Fe geochemical cycle. Geochim. Cosmochim. Acta. 68:4727-4743. PDF
  1. Wiesli, RA, Beard, BL, and Johnson, CM (2004) Experimental determination of Fe isotope fractionation between aqueous Fe(II), siderite, and “green rust” in abiotic systems. Chem. Geol. 211:343–362. PDF
  1. Jicha, BR, Singer, B, Brophy, JG, Fournelle, JH, Johnson, CM, Beard, BL, Lapen, TJ, and Mahlen, NJ (2004) Variable impact of the subducted slab on Aleutian island arc magma sources: evidence from Sr, Nd, Pb, and Hf isotopes and trace element abundances. Jour. Petrol. 45:1845-1875. PDF
  1. Severmann, S, Johnson, CM, Beard, BL, German, CR, Edmonds, HN, Chiba, H, Green, DRH (2004) The effect of plume processes on the Fe-isotope composition of hydrothermally derived Fe in the deep ocean as inferred from the Rainbow vent site, Mid-Atlantic Ridge, 36º14’N. Earth Planet. Sci. Lett. 225: 63-76. PDF
  1. Schott, RC, Johnson, CM, and O’Neil, JR (2004) Late Cretaceous tectonic history of the Sierra-Salinia-Mojave arc as recorded in conglomerates of the Upper Cretaceous and Paleocene Gualala Formation, northern California Jour. Geophys. Res. 109:B02204, doi:10.1029/2003JB002845. PDF
  1. Johnson, C, Beard, B, and Albarède, F (2004), editors, “Reviews in Mineralogy and Geochemistry: Geochemistry of Non-Traditional Stable Isotopes”, vol. 55. Cover and Contents: PDF
  1. Johnson, C, Beard, B, and Albarède, F (2004) Chapter 1: Overview and General Concepts. In “Reviews in Mineralogy and Geochemistry: Geochemistry of Non-Traditional Stable Isotopes” 55:1-24. PDF
  1. Albarède, F and Beard, B (2004) Chapter 4: Analytical Methods for Non-Traditional Isotopes. In “Reviews in Mineralogy and Geochemistry: Geochemistry of Non-Traditional Stable Isotopes” 55:113-152. PDF
  1. Beard, B and Johnson, C (2004) Chapter 10A: Fe isotope variations in the modern and ancient Earth and other planetary bodies. In “Reviews in Mineralogy and Geochemistry: Geochemistry of Non-Traditional Stable Isotopes”. 55:319-357. PDF
  1. Johnson, C, Beard, B, Roden, E, Newman, D, and Nealson, K (2004) Chapter 10B: Isotopic constraints on biogeochemical cycling of Fe. In “Reviews in Mineralogy and Geochemistry: Geochemistry of Non-Traditional Stable Isotopes”. 55:359-408. PDF
  1. Croal, LR, Johnson, CM, Beard, BL, and Newman, DK (2004) Iron isotope fractionation by Fe(II)-oxidizing photoautotrophic bacteria. Geochim. Cosmochim. Acta 68:1227–1242. PDF
  1. Lapen, TJ, Mahlen, NJ, Johnson, CM, and Beard, BL (2004) High-precision Lu and Hf isotope analyses of both spiked and unspiked samples: a new approach. Geochemistry, Geophysics, and Geosystems (G3) v. 5, no. 1, 31 Jan. 2004 issue (18 pages). Includes erratum. PDF


  1. Wiesli RA, Beard BL, Taylor, LA, and Johnson, CM (2003) Space weathering processes on airless bodies: Fe isotope fractionation In the lunar regolith, Earth Planet. Sci. Lett. 216:457-465. PDF
  1. Welch, SA, Beard, BL, Johnson, CM, and Braterman, PS (2003) Kinetic and equilibrium Fe isotope fractionation between aqueous Fe(II) and Fe(III). Geochim. Cosmochim. Acta 67:4231-4250. PDF
  1. Beard, BL and Johnson, CM (2003) High and low temperature applications of Fe isotope geochemistry. The Geochemical News, 117:8-13. PDF
  1. Lapen, TJ, Johnson, CM, Baumgartner, LP, Mahlen, NJ, Beard, BL, and Amato, JM (2003) Burial rates during prograde metamorphism of an ultra-high-pressure terrane: an example from Lago di Cignana, western Alps, Italy. Earth Planet. Sci. Lett. 215:57-72. PDF
  1. Beard, BL, Johnson, CM, Von Damm, KL, Poulson, RL (2003) Iron isotope constraints on Fe cycling and mass balance in oxygenated Earth oceans. Geology 31: 629-632. PDF
  1. Hart, GL, Johnson, CM, Hildreth, W, and Shirey, SB (2003) New osmium isotope evidence for intra-crustal recycling of crustal domains with discrete ages. Geology 31: 427-430. PDF
  1. Medaris, LG, Jr, Dott, RH, Singer, BS, Naymark, A, Schott, RC, and Johnson, CM (2003) Late Paleoproterozoic climate, tectonics, and metamorphism in the southern Lake Superior region and proto-North America: Evidence from Baraboo interval quartzites. Jour. Geology 111:243-257. PDF
  1. Beard, BL, Johnson, CM, Skulan, JL, Nealson, KH, Cox, L, and Sun, H (2003) Application of Fe isotopes to tracing the geochemical and biological cycling of Fe. Special issue on Isotopic Record of Microbially Mediated Processes. Chem. Geol. 195:87-117. PDF
  1. Comment-Reply: Bullen, TD, White, AF, and Childs, CW (2003) Comment on ‘‘Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions’’ by Clark Johnson et al., [Earth Planet. Sci. Lett. 195 (2002) 141-153]. Earth Planet. Sci. Lett. 206:229-232. Johnson, CM, Brian, BL, Braterman, PS, and Welch, SA (2003) Reply to Comment on “Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions” by Thomas D. Bullen, Arthur F. White and Cyril W. Childs, Earth Planet. Sci. Lett Earth Planet. Sci. Lett. 206:233-236. PDF
  1. Johnson, CM, Beard, BL, Beukes, NJ, Klein, C, and O’Leary, JM (2003) Ancient Geochemical Cycling in the Earth as Inferred From Fe Isotope Studies of Banded Iron Formations from the Transvaal Craton. Contrib. Mineral. Petrol. 144:523-547. PDF


  1. Skulan JL, Beard BL, Johnson CM (2002) Kinetic and equilibrium Fe isotope fractionation between aqueous Fe(III) and hematite. Geochim. et Cosmochim. Acta. 66:2995-3015. PDF
  1. Hart, GL, Johnson, CM, Shirey, SB, and Clynne, MA (2002) Osmium isotope constraints on lower crustal recycling and pluton preservation at Lassen Volcanic Center, CA. Earth Planet. Sci. Lett., 199:269-285. PDF
  1. Johnson, CM, Skulan, JL, Beard, BL, Sun, H, Nealson, KH, and Braterman, PS (2002) Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions. Earth Planet. Sci. Lett. 195: 141-153. PDF
  1. Rhodes MK, Carrol AP, Pietras JT, Beard BL, Johnson CM (2002) Strontium isotope record of paleohydrology and continental weathering, Eocene Green River Formation, Wyoming. Geology 30:167-170. PDF
  1. Ezzo, JA, and Price, TD (2002). Migration, regional reorganization, and spatial group composition at Grasshopper Pueblo, Arizona. Jour. Archaeological Sci. 29:499- 520. PDF


  1. Schott, RC and Johnson, CM (2001) Garnet-bearing trondhjemite and other conglomerate clasts from the Gualala basin, California: Constraints on Eocene provenance, Paleogene tectonics, and Early Cretaceous magmatism. Geol. Soc. Amer. Bull. 113:870-880. PDF


  1. Olsen, SN, Johnson, CM, Beard, BL, and Baumgartner, LP (2000) New U-Pb zircon data and constraints on the age and mode of migmatization in the Aar Massif, Central Alps. European Jour. Mineral., 12, 1245-1260. PDF
  1. Beard, BL and Johnson, CM (2000) Strontium isotope compositions of skeletal material can determine the birth place and geographic mobility of animals and humans. Jour. Forensic Sci., Sep. 2000, 1049-1061. PDF


  1. Johnson, CM and Winter, BL (1999) Provenance analysis of Lower Paleozoic cratonic quartz arenites of the northern Midcontinent region: U-Pb and Sm-Nd isotope geochemistry: Geological Society of America Bulletin 111, 1723-1738. PDF
  1. Johnson, CM and Beard, BL (1999) Correction of instrumentally-produced mass fractionation during isotopic analysis of Fe by thermal ionization mass spectrometry. International Journal of Mass Spectrometry 193, 87-99. PDF
  1. Beard, B.L., Johnson, C.M., Cox, L., Sun, H., and Nealson, K.H. (1999) Iron Isotope Biosignatures: Science, 285, 1889-1892. PDF
  1. Amato, JM, Johnson, CM, Baumgartner, L, and Beard, BL (1999) Rapid exhumation of the Zermatt-Saas ophiolite deduced from high-precision Sm-Nd and Rb-Sr geochronology. Earth and Planet. Sci. Lett. 171:425-438. PDF
  1. Beard, BL and Johnson, CM (1999) High-precision Fe isotope compositions of lunar and terrestrial materials: Geochimicia et Cosmochimica Acta 63, 1653-1660. PDF


  1. Beard, BL, Taylor, LA, Scherer, EE, Johnson, CM, and Snyder, GA (1998) The source region and melting mineralogy of high- and low-Ti mare basalts deduced from Lu-Hf isotopic data. Geochim. Cosmochim. Acta 62:525-544. PDF
  1. Schott, RC and Johnson, CM (1998) Sedimentary record of the Late Cretaceous thrusting and collapse of the Salinia-Mojave magmatic arc. Geology 26:327-330. PDF
  1. Schott, RC and Johnson, CM (1998) Late Cretaceous to Eocene Gualala basin provenance constraints from conglomerate clasts: implications for the origin and early evolution of the Salinian block. in Elder, WP, ed., Geology and tectonics of the Gualala block, northern California. SEPM Book 84:75-94. PDF


  1. Beard B.L. and Johnson CM (1997) Hafnium isotope evidence for the origin of Cenozoic basaltic lavas from the southwestern United States. Jour. Geophys. Res. 102, 20149-20178. PDF
  1. Ezzo, JA, Johnson, CM, and Price, TD (1997) Analytical perspectives on prehistoric migration: a case study from east-central Arizona. Jour. Archaeological Sci. 24:447-466. PDF
  1. Grupe G, Price, TD, Schroter, P, Sollner F, Johnson, CM, and Beard, BL (1997) Mobility of Bell Beaker people revealed by strontium isotope ratios of tooth and bone; a study of southern Bavarian skeletal remains. Applied Geochemistry 12:517-525. PDF
  1. Scherer, EE, Cameron, KL, Johnson, CM, Beard, BL, Barovich, KM, and Collerson, KD (1997) An improved whole-rock Lu-Hf analytical method applied to dating Cenozoic events affecting lower crustal xenoliths from Kilbourne Hole, New Mexico, Chem. Geol. 142:63-78. PDF
  1. Van Wyck, N and Johnson, CM (1997) Common lead, Sm-Nd, and U-Pb constraints on petrogenesis, crustal architecture, and tectonic setting of the Penokean orogeny (Paleoproterozoic) in Wisconsin. Bull. Geol. Soc. Amer. 109:799-808. PDF
  1. Winter, BL, Clark, DL, and Johnson, CM (1997). Late Cenozoic Sr isotope evolution of the Arctic Ocean: Constraints on water mass exchange with lower latitude oceans. Deep Sea Research 44:1531-1542. PDF
  1. Winter, BL, Johnson, CM, and Clark, DL (1997) Sr, Nd, and Pb isotope variations of authigenic and silicate sediment components from the Late Cenozoic Arctic Ocean: Implications for sediment provenance and source of trace metals in seawater. Geochim. Cosmochim. Acta 61:4181-4200. PDF
  1. Winter, BL, Johnson, CM, and Clark, DL (1997) Geochemical constraints on the formation of Late Cenozoic ferromanganese micronodules from the central Arctic Ocean. Marine Geology 138:149-169. PDF


  1. Johnson, CM, Shirey, SB, and Barovich, KM (1996) New approaches to crustal evolution studies and the origin of granitic rocks through the Lu-Hf and Re-Os isotope systems: Roy. Soc. Edinburgh-Earth Sciences 87:339-352. Also published as Geological Society of America Special Paper 315. PDF
  1. Winter, BL, Clark, DL, and Johnson, CM (1996) Elemental and Isotope Geochemistry of Sediment from the Arctic Ocean. The 1994 Arctic Ocean Section: The First Major Scientific Crossing of the Arctic Ocean. U.S. Army Cold Regions Res. and Engin. Lab., Special Report 96-23: 90-96. PDF
  1. Magavern, S, Clark, DL, and Clark, SL (1996) 87Sr/86Sr, phytoplankton, and the nature of the Late Cretaceous and Early Cenozoic Arctic Ocean. Marine Geol. 133:183-192. PDF


  1. Barovich, KM, Beard, BL, Cappel, JM, Johnson, CM, Kyser, TK, and Morgan BE (1995) A chemical method for hafnium separation from high-Ti whole-rock and zircon samples. Chem. Geol. 121:303-308. PDF
  1. Beard BL, Medaris, LG Jr, Johnson, CM, Jelinek, E, Tonika, J, and Riciputi LR (1995) Geochronology and geochemistry of eclogites from the Mariánské Lázne Complex, Czech Republic: Implications for Variscan Orogenesis. Geol. Rundsch. 84:552-567. PDF
  1. Medaris, LG Jr, Beard, BL, Johnson, CM, Valley, JW, Spicuzza, MJ, and Misar, Z (1995) Garnet pyroxenite and eclogite in the Bohemian Massif: geochemical evidence for Variscan recycling of subducted lithosphere. Geol. Rundsch. 84:489-505. PDF
  1. Riciputi, LR, Johnson, CM, Sawyer, DA, and Lipman, PW (1995) Crustal and magmatic evolution in a large multicyclic caldera complex: isotopic evidence from the central San Juan volcanic field. Jour. Volcanol. Geotherm. Res. 67:1-28. PDF
  1. Walker, JA, Carr, MJ, Patino, LC, Johnson, CM, Feigenson, MD, and Ward, RL (1995) Abrupt change in magma generation processes across the Central American arc in southeastern Guatemala: flux-dominated melting near the base of the wedge to decompression melting near the top of the wedge. Contrib. Mineral. Petrol. 120:378-390. PDF
  1. Winter, BL and Johnson, CM (1995) U-Pb dating of a carbonate subaerial exposure event. Earth Planet. Sci. Lett. 131:177-187. PDF
  1. Winter, BL, Valley, JW, Simo, A, Nadon, GC, and Johnson, CM (1995) Hydraulic seals and their origin: evidence from stable isotope geochemistry of dolomites in the Middle Ordovician St. Peter Sandstone, Michigan Basin. Amer. Assoc. Petrol. Geol. Bull. 79:30-48. PDF
  1. Winter, BL, Johnson, CM, Simo, A, and Valley, JW (1995) Paleozoic fluid history of the Michigan Basin: Evidence from dolomite and anhydrite geochemistry in the Middle Ordovician St. Peter Sandstone. Jour. Sed. Res. A65:306-320. PDF


  1. Simo, JA, Johnson, CM, Vandrey, MR, Brown, PE, Castrogiovanni, E, Drzewiecki, PE, Valley, JW, and Boyer, J (1994) Burial dolomitization of the Middle Ordovician Glenwood Formation by evaporitic brines, Michigan Basin. Int. Assoc. Sedimentologists, Spec. Publ. 21:169-186. PDF
  1. Price, TD, Johnson, CM, Ezzo, JA, Burton, JH, and Ericson, J (1994) Residential mobility in the Prehistoric Southwest: a preliminary study using strontium isotope analysis. Jour. Archaeological Sci. 21:315-330. PDF


  1. Johnson, CM and Beard, BL (1993) Evidence from hafnium isotopes for ancient sub-oceanic mantle beneath the Rio Grande rift. Nature 362:441-444. PDF
  1. Johnson, CM (1993) Mesozoic and Cenozoic contributions to crustal growth in the southwestern United States. Earth Planet. Sci. Lett. 118:75-89. PDF
  1. Beard, B.L. and Johnson, C.M. (1993) Hf isotope composition of late Cenozoic basaltic rocks from NW Colorado, USA: new constraints on mantle enrichment processes: Earth Planet. Sci. Lett.119:395-409. PDF


  1. Beard, B.L., Medaris, L.G., Jr., Johnson, C.M., Brueckner, H.K., and Mísar, Z. (1992) Petrogenesis of Variscan high-temperature Group A eclogites from the Moldanubian Zone of the Bohemian Massif, Czechoslovakia: Contrib. Mineral. Petrol. 111:468-483. PDF


  1. Johnson, C.M. (1991) Large scale crust formation and lithosphere modification beneath middle to late Cenozoic caldera complexes, western North America (invited): Jour. Geophys. Res. 96:13485-13507. PDF
  1. Johnson, C.M. and Thompson, R.A. (1991) Isotopic composition of Oligocene mafic volcanic rocks in the northern Rio Grande rift: evidence for contributions of ancient intraplate and subduction magmatism to evolution of the lithosphere: Jour. Geophys. Res. 96:13593-13608. PDF
  1. Thompson, R.A., Johnson, C.M., and Mehnert, H.H. (1991) Oligocene basaltic volcanism of the northern Rio Grande rift: San Luis Hills, Colorado: Jour. Geophys. Res. 96:13577-13592. PDF


  1. Comment-Reply: Johnson, C.M. (1990) Comment on “Lower crustal evolution under central Arizona: Sr, Nd and Pb isotopic and geochemical evidence from the mafic xenoliths of Camp Creek” by Esperanca, S., Carlson, R.W., and Shirey, S.B.: Earth Planet. Sci. Lett. 99:400-405. Esperanca, S., Carlson, R.W., and Shirey, S.B. (1990) Reply to comment by C.M. Johnson. Earth Planet. Sci. Lett. 99:406-409. PDF
  1. Riciputi, L.R. and Johnson, C.M. (1990) Nd and Pb isotope variations in the multicyclic central caldera cluster of the San Juan volcanic field, Colorado, and implications for crustal hybridization: Geology, 18, 975-978. PDF
  1. Johnson, C.M., Lipman, P.W., and Czamanske, G.K. (1990) H, O, Sr, Nd and Pb isotope geochemistry of the Latir volcanic field and cogenetic intrusions, New Mexico, and relations between evolution of a continental magmatic center and modifications of the lithosphere: Contrib. Mineral. Petrol. 104:99-124. PDF
  1. Johnson, C.M. and Fridrich, C.J. (1990) Non-monotonic chemical and O, Sr, Nd, and Pb isotope zonations and heterogeneity in the mafic- to silicic-composition magma chamber of the Grizzly Peak Tuff, Colorado: Contrib. Mineral. Petrol. 105:677-690. PDF


  1. Johnson, C.M., Shannon, J.R., and Fridrich, C.J. (1989) Roots of ignimbrite calderas: batholithic plutonism, volcanism, and mineralization in the southern Rocky Mountains, Colorado and New Mexico: NM Bur. Mines Mineral. Res. Memoir 46, 275-302. PDF
  1. Johnson, C.M. (1989) Isotopic zonations in silicic magma chambers: Geology 17:1136-1139. PDF
  1. Johnson, C.M., Czamanske, G.K., and Lipman, P.W. (1989) Geochemistry of intrusive rocks associated with the Latir volcanic field, New Mexico, and contrasts between evolution of plutonic and volcanic rocks: Contrib. Mineral. Petrol. 103:90-109. PDF


  1. Johnson, C.M. and Lipman, P.W. (1988) Origin of metaluminous and alkaline volcanic rocks of the Latir volcanic field, northern Rio Grande rift, New Mexico: Contrib. Mineral. Petrol. 100:107-128. PDF