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Isotopic And Geochemical Investigations Of MeteoritesThe primary goals of our research over the past four years are to constrain the timing of certain early planetary accretion/differentiation events, and to constrain the proportions and provenance of materials involved in these processes. This work was achieved via the analysis and interpretation of long- and short-lived isotope systems, and the study of certain trace elements. Our research targeted these goals primarily via the application of the Re-187, Os-187, Pt-190 Os-186 Tc-98 Ru-99 and Tc-99 Ru-99 isotopic systems, and the determination/modeling of abundances of the highly siderophile elements (HSE; including Re, Os, Ir, Ru, Pd, Pt, and maybe Tc). The specific events we examined include the segregation and crystallization histories of asteroidal cores, the accretion and metamorphic histories of chondrites and chondrite components, and the accretionary and differentiation histories of Mars and the Moon.
Document ID
20050226975
Acquisition Source
Headquarters
Document Type
Contractor or Grantee Report
Authors
Walker, Richard J. (Maryland Univ. College Park, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-10425
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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