Joining NASA's Astromaterials Research and Exploration Science Directorate (ARES) starting Jan. 2010.
Curriculum vitae (pdf)
ph 510-642-9524
fax 510-642-9520
483 McCone Hall
Earth and Planetary Sciences
University of California
Berkeley, CA 94720-4767
Justin Simon is primarily interested in the role that igneous processes play in the formation of planetary materials. These interests span topics regarding the formation of primitive rocky materials (chondritic meteorites) to magma chamber processes on Earth. He uses geochronologic tools because they provide fundamental constraints on the sequence and time scales of these phenomena. Justin grew up in Los Angeles. He received his B.A. (Geology, 1996) from Macalester College, MSc. (Geochemistry, 2000) from the Colorado School of Mines, and Ph.D. (Geology, 2005) from UCLA. He is an active member of two research groups, Prof. Paul Renne’s at the BGC and Prof. Don DePaolo’s Center for Isotope Geochemistry.
He has begun his post doctorate research by measuring radiogenic Ca isotopes of silicate rocks to study the petrogenetic pathways and sources of planetary (and protoplanetary) materials, as well as, those of igneous rocks on Earth. He is also taking an integrated approach to establish the time span(s) exhibited by crystals in rhyolites using high precision Ar/Ar eruption and in situ U-Pb and U-series pre-eruption crystal dating. These ages coupled with existing isotopic and geochemical data of select well-studied Quaternary volcanic centers will be used to address the time scales of rhyolite magma genesis. Other terrestrial and extraterrestrial projects are also in the mill, so please stay tuned.
Simon, J. I., and D. J. DePaolo (accepted). Stable Calcium Isotopic Composition of Meteorites and Rocky Planets, EPSL.
Simon, J. I., Vazquez, J. A., Renne, P. R., Schmitt, A. K., Bacon, C. R., and M. R. Reid, 2009. Accessory mineral U-Th-Pb ages and 40Ar/39Ar eruption chronology, and their bearing on rhyolite magma evolution in the Pleistocene Coso volcanic field, California, CMP.
Simon, J. I., DePaolo, D. J., and F. Moynier, 2009. Calcium Isotope Composition of Meteorites, Earth, and Mars, ApJ. Vol. 702, 707-715.
Simon, J. I., Renne, P.R., and R. Mundil, 2008. Implications of pre-eruptive magmatic histories of zircons for U-Pb geochronology of silicic extrusions, EPSL. Vol. 266, 182-194.
Simon, J. I., Reid, M. R., and E. D. Young, 2007. Lead isotopes by LA-MC-ICPMS: tracking the emergence of mantle signatures in an evolving silicic magma system, GCA. Vol. 71, 2014-2035.
Simon, J. I., Young, E. D., Russell, S. S., Tonui, E. K., Dyl, K., and C. E. Manning, 2005. A short timescale for changing oxygen fugacity in the solar nebula revealed by high-resolution 26Al-26Mg dating of CAI, Earth and Planetary Science Letters. Vol. 238, 272-283.
Simon, J. I. and M. R. Reid, 2005. The pace of rhyolite differentiation and storage in an ‘archetypical’ silicic magma system, Long Valley, California, Earth and Planetary Science Letters. Vol. 235, 123-140.
Young, E. D., Simon, J. I., Galy, A., Tonui, E., Russell, S. S., and O. Lovera, 2005. Supracanonical 26Al/27Al and the Residence Time of CAIs in the Solar Protoplanetary Disk, Science. Vol. 308, 223-227, 10.1126/science.1108140.