Director, WiscSIMS Laboratory
Office: 145 Weeks Hall
The University of Wisconsin SIMS lab (WiscSIMS) was installed in 2005 and became a National Facility for Stable Isotope Geochemistry in 2008 with support from NSF, Division of Earth Sciences, Instrumentation and Facilities Program. The WiscSIMS lab houses a CAMECA IMS-1280. The IMS-1280 is a large radius multi-collector ion microprobe incorporating many improvements over earlier instruments, several of which are designed to enhance precision and accuracy of isotope ratio analysis.
Primitive meteorites recorded the early evolution of the solar system. We use SIMS to obtain high precision isotope analyses of pristine meteorite samples, such as Ca, Al-rich inclusions and chondrules in order to address the timing of their formation and the condition of proto-planetary disk in which they formed. We are also interested in precious particles collected from asteroids and comets by space missions, such as NASA Stardust Mission.
Nakashima D, Kita NT, Ushikubo T, Noguchi T, Nakamura T and Valley JW (2013). Oxygen three-isotope ratios of silicate particles returned from asteroid Itokawa by the Hayabusa spacecraft: A strong link with equilibrated LL chondrites. Earth Planet. Sci. Lett. 379, 127-136. doi:10.1016/j.epsl.2013.08.009 (posted 8/6/2013)
Bullock ES, Knight KB, Richter FM, Kita NT, Ushikubo T, Davis AM, MacPherson GJ and Mendybaev RA (2013). Mg and Si isotopic fractionation patterns in types B1 and B2 CAIs: Implications for formation under different nebular conditions. Meteorit. Planet. Sci. 48, 1440-1458. doi:10.1111/maps.12158 (posted 8/6/2013)
Kita NT, Yin Q-Y, MacPherson GJ, Ushikubo T, Jacobsen B, Nagashima K, Kurahashi E, Krot AN and Jacobsen SB (2013). 26Al-26Mg isotope systematics of the first solids in the early Solar System. Meteorit. Planet. Sci. 48, 1383-1400. doi:10.1111/maps.12141 (posted 5/16/2013)
Kita NT, Welten KC, Valley JW, Spicuzza MJ, Nakashima D, Tenner TJ, Ushikubo T, MacPherson GJ, Welzenbach L, Heck PR, Davis AM, Meier MMM, Wieler R, Caffee MW, Laubenstein M and Nishiizumi K (2013). Fall, classification, and exposure history of the Mifflin L5 chondrite. Meteorit. Planet. Sci. 48, 641-655. doi:10.1111/maps.12077 (posted 3/13/2013)
Ushikubo T, Nakashima D, Kimura M, Tenner TJ and Kita NT (2013). Contemporaneous formation of chondrules in distinct oxygen isotope reservoirs. Geochim. Cosmochim. Acta 109, 280-295. doi:10.1016/j.gca.2013.01.045 (posted 2/14/2013)
44rd Lunar and Planetary Science Conference (March 18-22, 2013): See abstracts.
Other Cosmochemists in UW-Madison