Alkali differentiation in LL-chondrites

Details Alkali differentiation in LL-chondrites Alkali differentiation in LL-chondrites

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..743w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, April 1983, p. 743-757. Research supported by the Smithsonian Institu

Computer Science

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Chondrites, Meteoritic Composition, Mineralogy, Potassium, Crystallization, Glass, Inclusions, Petrology, Photomicrography, Sodium, Meteorites, Ll Chondrites, Alkali, Differentiation, Comparisons, Krahenberg, Bhola, Compositon, Fragments, Chondrules, Crystals, Iron, Magnesium, Enrichment, Rare Earth Elements, Concentrations, Sodium, Sr, Element Ratios, Major Elements, Silicon, Aluminum, Calcium, Potassium, Glass, Plagioclase, Olivines, Formation, Oxygen, Fugacity, Parent Bodies, Vapor, Liquids, Volatilizati

Scientific paper

The Kraehenberg and Bhola LL-group chondrites are heterogeneous agglomerates which contain a variety of lithic fragments and chondrules as well as crystal fragments. Both meteorites contain large, cm-sized fragments with high K enrichments. The K-rich inclusions are fragments of larger rock bodies which crystallized from melts of chondritic parent material that had previously been enriched in K and in heavier alkalies,while also being depleted in Na and metal. It is suggested that the K enrichment occurred as an exchange for Na in feldspars via a vapor phase, whose presence on the chondrite parent body (or bodies) is supported by the recent finding of fluid inclusions in chondritic silicates. Cooling rate considerations indicate that the K-rich rock units could not have been very large, implying that the K-rich materials were locally molten by, for example, impact.

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