REE and other trace element chemistry of oldhamite (CaS) in the Qingzhen chondrite (EH3) and their genetic implications

Details REE and other trace element chemistry of oldhamite (CaS) in the Qingzhen chondrite (EH3) and their genetic implications REE and other trace element chemistry of oldhamite (CaS) in the Qingzhen chondrite (EH3) and their genetic implications

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993chjge..12..317c&link_type=abstract

Chinese Journal of Geochemistry, vol. 12, p. 317

Computer Science

Chondrites, Interstellar Chemistry, Meteoritic Composition, Rare Earth Elements, Trace Elements, Enstatite, Solar System, Petrology, Sulfides, Lithosphere, High Temperature Environments, Condensing

Scientific paper

Instrumental neutron activation analysis (INAA) of 14 single oldhamite grains separated from the Qingzhen chondrite (EH3) for refractory, volatile, and siderophile elements revealed that oldhamite is highly rich in refractory elements. The mineral serves as the principal carrier of REE and contains about 80 percent of the REEs in the Qingzhen enstatite chondrite. Furthermore, the large enrichment of LREE relative to HREE is noticed in oldhamite from the Qingzhen. In general, the oldhamite from metal-sulfide assemblages is richer in REE than that from the matrix, i.e., the earlier the oldhamite grains condensed, the richer they are in REE. Meanwhile, oldhamite is also rich in volatile elements such as Se, Br, etc. In terms of the distribution of trace elements in oldhamite from the Qingzhen, the chondrite is suggested to have resulted from high-temperature condensation of the solar nebula.

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