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John Weirich

Post-Doctoral Fellow

Centre for Planetary Science and Exploration (CPSX)

Research Interest

Research Interests

•    Diffusion modeling
•    40Ar/39Ar and (U-Th)/He methods
•    Mass spectrometry
•    All age dating techniques, including cosmogenic ages
•    Impact chronology of meteorites, Apollo samples, and Earth
•    Impact melt formation and emplacement

Publications

Publications

Swindle T. D., Kring D. A., and Weirich J. R. (2013). 40Ar/39Ar ages of impacts involving ordinary chondrite meteorites. In 40Ar/39Ar Dating: from Geochronology to Thermochronology, from Archaeology to Planetary Sciences Geological Society of London Special Publication 378. In Press.

Weirich J. R., Swindle T. D., Isachsen C. E., Sharp T. G., Li C., and Downs R. T. (2012). Source of Potassium In Shocked Ordinary Chondrites. Geochimica Et Cosmochimica Acta 98: 125-139.

Weirich J. R., Swindle T. D., and Isachsen C. E. (2012). 40Ar-39Ar age of Northwest Africa 091: More evidence for a link between L chondrites and fossil meteorites. Meteoritics and Planetary Science 47:1324-1335.

Weirich J. R., Isachsen C. E., Johnson J. R., and Swindle T. D. (2012). Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples. Geochimica Et Cosmochimica Acta, 77, 546–560.

Weirich J. R., Isachsen C. E., Johnson J. R., and Swindle T. D. (2012). Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples. Geochimica Et Cosmochimica Acta, 77, 546–560.

Weirich J. R., Wittmann A., Isachsen C. E., Rumble D., Swindle T. D., and Kring D. A. (2010). The Ar-Ar age and petrology of Miller Range 05029: Evidence for a large impact in the very early solar system. Meteoritics & Planetary Science, 45(12), 1868–1888.

Swindle T. D., Isachsen C. E., Weirich J. R., and Kring D. A. (2009). 40Ar-39Ar ages of H-chondrite impact melt breccias. Meteoritics & Planetary Science, 44(5), 747–762.., and Kring D. A. (2009). 40Ar-39Ar ages of H-chondrite impact melt breccias. Meteoritics & Planetary Science, 44(5), 747–762.

Recent Abstracts

Recent Abstracts

Weirich, J. R., Wittmann, A., Isachsen, C. E., Rumble, D., Swindle, T. D., and Kring, D. A. (2013). Miller Range 05029: Evidence for a Large Impact on the L Chondrite Parent Body >4.5 Ga. Large Meteorite Impacts and Planetary Evolution V: A3062.

Weirich J. R., Isachsen C.E., Swindle T.D. (2011) LPSC:A1910.

Weirich J. R., Isachsen C.E., Swindle T.D., Li C., Downs R.T. (2011) LPSC:A1887.

Weirich J. R., Isachsen C.E., Johnson J.R., Swindle T.D. (2010) AGU 53:V51A-2169.

Weirich J. R., Isachsen C., Johnson J.R., Swindle T.D. (2010) LPSC:A2137.

Weirich J. R., Isachsen C., Swindle T. D., Kring D. A., (2009) MAPS:A215.

Weirich J. R., Wittmann A., Swindle T.D., and Kring D.A. (2008) AGU 53:V53B-2155.

Weirich J. R., Isachsen C., Kring D. A., and Swindle T. D. (2008) LPSC:A1391.

Weirich J. R. and Swindle T. D. (2007). LPSC:A1310.

Weirich J. R., Brown R. H., and Lauretta D. S. (2004). DPS 36:A1143.

Strelnitski V., *Weirich J. (2001) AAS 199:A1419

Weirich J. R., Samus, N., Baranov, A. (2001) AAS 199:A1499.

Degrees Obtained

Degrees Obtained

University of Arizona, Tucson, Arizona, May 2011
Ph.D. Planetary Science, Minor in Geoscience, Dissertation: Improvements to Argon-Argon Dating of Extraterrestrial Materials.  Advisor: Timothy D. Swindle

Missouri School of Science and Technology, Rolla, Missouri, Dec 2001
B.S. Physics, Minor in Math and Philosophy; Summa Cum Laude

East Central College, Union, Missouri, May 1999
Associates Degree, Pre-Engineering

Awards & Scholarships

Awards & Fellowships

•    Galileo Circle Scholar 2009–2010
•    NASA Earth and Space Science Fellowship, 2008–2010
•    University of Arizona Graduate Registration Scholarship, 2004–2007
•    President’s Scholarship, 1997