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Clark Johnson

Clark M. Johnson
Vilas Distinguished Professor
Isotope Geochemistry, Geochronology, Petrology, Astrobiology
(608) 262-1710
Office: 329 Weeks Hall







My primary research interests lie in application of stable and radiogenic isotopes to study of ancient life and crust and mantle evolution. This includes topics ranging from astrobiology to the origin of igneous rocks and evolution of volcanic systems.

A major new initiative is our membership in the NASA Astrobiology Institute. I am the PI for the Wisconsin Astrobiology Research Consortium.

I am also interested in mountain building and metamorphism, as well as low-temperature studies involving diageneis, sedimentary provenance, migration of ancient people, and geomicrobiology.

For more information about research, visit the Radiogenic Isotope Lab web site.

A list of publications and PDF files may be found here.

A complete vitae may be found here. [Requires Adobe Acrobat]


All levels of undergraduate and graduate courses, seminars, and field courses, including Introductory Geology, Geology of National Parks, Earthquakes and Volcanoes, Igneous Petrology, Geochemistry, Magmatic Systems, Mountain Belts, Phase Equilibria, Thermodynamics, Advanced Petrology and Geochemistry, Isotope Geology.

Departmental Responsibilities

A major new initiative for the Department is our membership in the NASA Astrobiology Institute. I am the PI for the Wisconsin Astrobiology Research Consortium.