Thermal histories and parent body(ies) of EH chondrites - Evidences from new highly equilibrated EHs (Y793225, 82189, 8404, 8414 and 86004)

Details Thermal histories and parent body(ies) of EH chondrites - Evidences from new highly equilibrated EHs (Y793225, 82189, 8404, 8414 and 86004) Thermal histories and parent body(ies) of EH chondrites - Evidences from new highly equilibrated EHs (Y793225, 82189, 8404, 8414 and 86004)

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..817l&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 817.

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Thermal Analysis, Chondrites, Enstatite, Petrography, Classifications

Scientific paper

Enstatite chondrites, the most reduced among chondrites, are classified into EH and EL groups. Different from EL group predominant with EL6 type, EH group has abundant EH3 members but only a few EH5 meteorites collected. Recently, LEW88180 was reported as a new EH5 or the first EH6. In this work, we report petrography and mineral chemistry of 5 new Antarctic enstatite chondrites, i.e. Y793225 (E6), Y82189 (E6), Y8404 (E5), Y8414 (E4) and Y86004 (E6). Y8404, 8414 and 86004 are probably paired and could be classified together with Y82189 as EH6. Y793225 shows intermediate mineral chemistry between EH and EL, it is an anomalous EH6 or may represent a new group of enstatite chondrites. We noticed that EH chondrites could be divided into two subgroups, one has higher MnS-content of niningerite and shows evidences for a slower cooling history in comparison with the other.

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