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Re-Os Systematics and HSE Distribution in Metal from Ochansk (H4) ChondritePrevious studies of the Re-Os systematics of chondrites have documented considerable variation in the Re/Os ratios of whole rock samples. For some whole rock chondrites, Re-Os systematics display large deviations from the primitive isochron that are considerably larger than deviations in other isotope systems. Possible interpretation of these facts is that the Re-Os system in chondrites is particularly sensitive to post-formation alteration processes, thus providing a useful tool to examine such processes. Significant variations that have been detected in highly siderophile element (HSE) patterns for ordinary chondrites support this conclusion. We report Re-Os isotope data for metal separates from the Ochansk H4 chondrite coupled with abundance data for Ru, Pd, Ir, and Pt, determined in the same samples by isotope dilution. We chose this meteorite mainly because it is an observed fall with minimal signs of weathering, and its low metamorphic grade (H4) and shock stage (S3).
Document ID
20030111272
Document Type
Conference Paper
Authors
Smoliar, M. I. (Carnegie Institution of Washington Washington, DC, United States)
Horan, M. F. (Carnegie Institution of Washington Washington, DC, United States)
Alexander, C. M. OD. (Carnegie Institution of Washington Washington, DC, United States)
Walker, R. J. (Maryland Univ. College Park, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-10425
Distribution Limits
Public
Copyright
Public Use Permitted.

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