The trace element chemistry of CaS in enstatite chondrites and some implications regarding its origin

Details The trace element chemistry of CaS in enstatite chondrites and some implications regarding its origin The trace element chemistry of CaS in enstatite chondrites and some implications regarding its origin

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..123l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 2-3, July 1987, p. 123-134.

Mathematics

Logic

20

Calcium Sulfides, Chondrites, Meteoritic Composition, Petrography, Trace Elements, Concentration (Composition), Cosmology, Electron Microscopy, Metamorphism (Geology), Nebulae, Meteorites, Stony Meteorites, Chondrites, Enstatites, Trace Elements, Chemistry, Origin, Oldhamite, Neutron Activation Analysis, Temperature, Inaa, Samples, Meteorite, Petrology, Microscope Methods, Minor Elements, Microprobe Methods, Metamorphism, Distribution, Enrichment, Volatiles, Lithophiles, Chalcophiles, Concentration, Refract

Scientific paper

The trace element distribution in oldhamite (CaS) extracted from enstatite chondrites was determined by INAA. Prior to extraction, the petrologic setting of the grains was studied microscopically, and their minor element contents determined by microprobe analysis; samples that displayed a wide range of minor element contents were selected for detailed elementary analysis. Those samples of CaS suspected to be more primitive on the basis of their minor element and petrologic siting contain the entire inventory of the host meteorite's light REE (LREE) and Eu, plus 30-50 percent of the heavy-REE inventory. In less primitive samples, the LREE are less enriched although Eu remains highly concentrated. Several other elements, including lithophiles and chalcophiles, are most enriched in the most primitive CaS. It is suggested that oldhamite played a key role in the redistribution of these elements during the metamorphism and evolution of enstatite-rich material.

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