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The fate or organic matter during planetary accretion - Preliminary studies of the organic chemistry of experimentally shocked Murchison meteoriteThe fate of organic matter in carbonaceous meteorites during hypervelocity (1-2 km/sec) impacts is investigated using results of experiments in which three samples of the Murchison (CM2) carbonaceous chondrite were shocked to 19, 20, and 36 GPa and analyzed by highly sensitive thermal-desorption photoionization mass spectrometry (SALI). The thermal-desorptive SALI mass spectra of unshocked CM2 material revealed presence of indigenous aliphatic, aromatic, sulfur, and organosulfur compounds, and samples shocked to about 20 GPa showed little or no loss of organic matter. On the other hand, samples shocked to 36 GPa exhibited about 70 percent loss of organic material and a lower alkene/alkane ratio than did the starting material. The results suggest that it is unlikely that the indigenous organic matter in carbonaceous chondritelike planetesimals could have survived the impact on the earth in the later stages of earth's accretion.
Document ID
19930033987
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tingle, Tracy N. (Stanford Univ.; SRI International Molecular Physics Lab., Menlo Park, CA, United States)
Tyburczy, James A. (Arizona State Univ. Tempe, United States)
Ahrens, Thomas J. (California Inst. of Technology Pasadena, United States)
Becker, Christopher H. (SRI International Molecular Physics Lab. Menlo Park, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Origins of Life and Evolution of the Biosphere
Volume: 21
Issue: 6-May
ISSN: 0169-6149
Subject Category
SPACE BIOLOGY
Funding Number(s)
CONTRACT_GRANT: NAGW-1953
CONTRACT_GRANT: NSF EAR-86-09782
CONTRACT_GRANT: NAGW-1941
Distribution Limits
Public
Copyright
Other