Some refractory and volatile element chemistry of CaS in enstatite chondrites
by Chen, Y. H.; Benoit, P. H.
INAA data far REE, Sc, Se, Br and Zn in CaS extracted from 5 enstatite chondrites (Qingzhen EH3, St, Marks EH5, Atlanta EL6, Hvittis EL6 and Pillistfer EL6) are reported. The results indicate that the REE abundances in CaS from unequilibrated erstatite chondrite, Qingzhen, are much higher than that from equilibrated ones. similarly, the abundances of Sc, Se, Br and Zn in CaS from Qingzhen are higher than that in CaS grains from equilibrated chondrites, revealing that CaS is a previous condensate and is not simple residues of an evaporative process. Secondly, metamorphism has caused the redistribution of the trace elements among the minerals in enstatite chondrites, and this metamorphic fractionation reflects the differences from element volatilities and chemical properties. The REE patterns of CaS of enstatite chondrites and aubrites could not explain that aubrites were derived from known enstatite chondrites by igneous processing. And depleted europium in metamorphism and igneous process may be carried by Cr-bearing sulfides (minerals A and B).
- Journal
- Science in China Series D-Earth Sciences
- Volume
- 39
- Issue
- 2
- Year
- 1996
- Start Page
- 184-193
- URL
- https://www.webofscience.com/wos/woscc/full-record/WOS:A1996WA99900008
- ISBN/ISSN
- 1006-9313