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Chemical studies of H chondrites. 6: Antarctic/non-Antarctic compositional differences revisitedWe report data for the trace elements Au, Co, Sb, Ga, Rb, Ag, Se, Cs, Te, Zn, Cd, Bi, T1, and In (ordered by putative volatility during nebular condensation and accretion) determined by radiochemical neutron activation analysis of 14 additional H5 and H6 chondrite falls. Data for the 10 most volatile elements (Rb to In) treated by the multivariate techniques of linear discriminant analysis and logistic regression in these and 44 other falls are compared with those of 59 H4-6 chondrites from Antarctica. Various populations are tested by the multivariate techniques, using the previously developed method of randomization-simulation to assess significance levels. An earlier conclusion, based on fewer examples, that H4-6 chondrite falls are compositionally distinguishable from the Antarctic suite is verified by the additional data. This distinctiveness is highly significant because of the presence of samples from Victoria Land in the Antarctic population, which differ compositionally from falls beyond any reasonable doubt. However, it cannot be proven unequivocally that falls and Antarctic samples from Queen Maud Land are compositionally distinguishable. Trivial causes (e.g., analyst bias, weathering) cannot explain the Victoria Land (Antarctic)/non-Antarctic compositional difference for paradigmatic H4-6 chondrites. This seems to reflect a time-dependent variation of near-Earth meteoroid source regions differing in average thermal history.
Document ID
19950052480
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wolf, Stephen F.
(Purdue University West Lafayette, IN, United States)
Lipschutz, Michael E.
(Purdue University West Lafayette, IN, United States)
Date Acquired
August 16, 2013
Publication Date
February 25, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: E2
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
95A84079
Funding Number(s)
CONTRACT_GRANT: NAG9-48
CONTRACT_GRANT: DE-FG07-80ER1-0725J
CONTRACT_GRANT: NAGW-3396
Distribution Limits
Public
Copyright
Other

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