Lawrence Livermore National Laboratory

 +1 925-424-5722

Ph.D. Isotope Geochemistry
University of Texas at Austin
M.A. Igneous Petrology
University of Texas at Austin
B.A. Earth Science and Paleontology
University of California at Berkeley

Research Interests

Geochronology and geochemistry of samples from asteroids, Moon, and Mars and in order to constrain the nature and timing of processes occurring in the proto-planetary disk and planetary bodies early in the history of the Solar System. Of particular interest are constraining the sources of nucleosynthetic materials in the nascent solar nebula using stable heavy isotopes and the defining timing of the formation and differentiation of the terrestrial planets using long- and short-lived isotopic chronometers.

Committees Served Last 5 Years

  1. NASA Advisory Council (Planetary Sciences Subcommittee)
    • Subcommittee Chair: Dr. Sean Solomon
    • NASA science advisory subcommittee on science and exploration policy
  2. Curation and Analysis Planning Team for Extraterrestrial Materials (CAPTEM)
    (Chair Lunar allocation Subcommittees)
    • CAPTEM Chair: Meenakshi Wadhwa
    • Advise NASA Science Mission Directorate on sample collection and curation issues and allocate extraterrestrial materials collected during NASA space missions
  3. Mars Exploration Program and Analysis Group (MEPAG)
    (Goals Committee)
    • Chair: Dr. Jack Mustard
    • Provide science input for planning and prioritizing Mars exploration activities for the next several decades to Mars Exploration Program Office

Publications 2007-Present

Elardo S. M., Shearer C.K., Fagan A. L., Borg L. E., Gaffney A. M., Burger P.V., Neal C.R., Fernandes V. A., McCubbin F. M. (2014) The origin of young mare basalts inferred from lunar meteorites Northwest Africa 4734, 032, and LaPaz Icefield 02205. Meteoritics & Planetary Science 1–31 doi: 10.1111/maps.12239

Brennecka G. A., Borg L. E., and Wadhwa M. (2013) Evidence for supernova injection into the solar nebula and the decoupling of r-process nucleosynthesis Proceedings of the National Academy of Sciences 110 p. 17241-17246.

Borg L. E., Connelly J. N., Boyet, M., and Carlson R. W. (2011) Evidence that the Moon is either young or did not have a global magma ocean. Nature, 477, 70-72

Gaffney A.M. , Borg L. E., Asmeron Y., Shearer C. K., & Burger P. (2011) Disturbance of isotopic systematics during experimental shock and thermal metamorphism of a lunar basalt with implications for martian meteorite chronology MAPS 46, 35-52.

Shearer C. K., Burger P. V., Neal C., Sharp Z., Spivak-Birndorf L., Borg L., Fernandes V. A., Papike J. J., Karner J., Wadhwa M., Gaffney A., Shafer J., Geissman J. W., Atudorei N. V., Herd C., Weiss B. P., King P. L., Crowther S. A., Gilmour J. D. (2010) Non-basaltic asteroidal magmatism during the earliest stages of solar system evolution; a view from Antarctic achondrites Graves Nunatak 06128 and 06129. Geochimica et Cosmochimica Acta. 74, 1172-1199.

Brennecka G. A., Borg L. E., Hutcheon I. D., Sharp M. A., and Anbar A. D. (2010) Natural variations in uranium isotope ratios of uranium ore concentrates: Understanding the 238U/235U fractionation mechanism. Earth and Planetary Science Letters, 291 228-233.

Borg L. E., Gaffney A. M., Shearer C. K., DePaolo D. J, Hutcheon I. D., Owens T. L., Ramon E., Brennecka G. (2009) Mechanisms for incompatible-element enrichment on the Moon deduced from the lunar basaltic meteorite Northwest Africa 032. GCA 73, 3963-3980 LLNL-JRNL-420814

Edmunson J., Borg L. E., Nyquist L. E., and Asmeron Y. (2009) A combined Sm–Nd, Rb–Sr, and U–Pb isotopic study of Mg-suite norite 78238: Further evidence for early differentiation of the Moon. Geochimica et Cosmochimica Acta 73, 514-527. LLNL-JRNL-408877

Borg L. E., Des Maris D. J., Beaty D. W [and 74 others] (2008) Science priorities for Mars sample return. Astrobiology, vol. 8, 489-535.

Shearer C. K., Burger P. V., Neal C. R., Sharp Z., Borg L. E., Spivak-Birndorf L., Washwa M., Papike J. J., Karner J. M., Gaffney, A. M., Shafer J., Weiss B. P., Geismann J., and Fernandez V. A. (2008) A unique glimpse into asteroidal melting processes in the early solar system from the Grave Nunatak 06128/06129 achondrites. American Mineralogist 93, 1937-1940.

Symes S. J, Borg L. E., Shearer C. K., and Irving A. J. (2008) The age of the martian meteorite Northwest Africa 1195 and the differentiation history of the shergottites, Geochimica et Cosmochimica Acta 72, 1696-1710. UCRL-JRNL-229742

Gaffney, A.M., Borg, L.E., and Connelly, J.N. (2007b) Uranium-lead isotope systematics of Mars inferred from the basaltic shergottite QUE94201. Geochimica et Cosmochimica Acta, v. 71, p. 5016-5031

Gaffney, A.M., Borg, L.E., and Asmerom, Y. (2007a) The origin of geochemical diversity of lunar mantle sources inferred from a combined U-Pb, Rb-Sr and Sm-Nd isotopic study of mare basalt 10017. Geochimica et Cosmochimica Acta, v. 71, p. 3656-3671

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