Chlorine metasomatism and elemental redistribution in unequilibrated ordinary chondrites

Details Chlorine metasomatism and elemental redistribution in unequilibrated ordinary chondrites Chlorine metasomatism and elemental redistribution in unequilibrated ordinary chondrites

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..476h&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 476-477

Computer Science

7

Chemical Composition, Chlorine, Chondrites, Olivine, Pyroxenes, Rare Earth Elements, Anomalies, Calcium, Crystallization, Feldspars

Scientific paper

Some Teischitz chondrules have mesostases partly altered to Na-Al-Cl-rich material similar to the 'white matrix' that fills channels between chondrules. Altered mesostases (and white matrix) are enriched in F, Cl, K, Rb, and Ba relative to unaltered mesostases. The alteration is located close to chondrule margins, so the fluids responsible probably came from outside the chondrules. We discuss Rare Earth Elements (REE) distribution between the three materials as a guide to the process(es) involved. One chondrule in Chainpur and one in Parnallee also have Cl-bearing phases. Their REE contents may be accounted for by closed-system crystallization, but extraneous fluid may be required for the introduction of Cl and Na.

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