Chondrules from Chainpur (LL-3) - Reduced parent rocks and vapor fractionation

Details Chondrules from Chainpur (LL-3) - Reduced parent rocks and vapor fractionation Chondrules from Chainpur (LL-3) - Reduced parent rocks and vapor fractionation

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68...43k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 68, no. 1, April 1984, p. 43-56. Sponsorship: Fonds zur Foerderung de

Computer Science

20

Abundance, Chemical Fractionation, Chondrites, Chondrule, Meteoritic Composition, Calcium, Chemical Composition, Chromium, Iron Oxides, Manganese, Scandium, Trace Elements, Meteorites, Chainpur, Ll Chondrites, Parent Bodies, Reduction, Vapor, Chondrules, Samples, Meteorite, Lithophiles, Mineralogy, Chemistry, Composition, Fractionization, Classification, Refractory Elements, Enrichment, Depletion, Abundance, Formation, Reduction, Oxidation, Parameters, Hypotheses, Density, Pressure, Volatiles

Scientific paper

Nineteen chondrules from the Chainpur chondrite have been analyzed for their bulk lithophile element content and mineral chemistry. The most refractory chondrules are depleted in K, leading to the conclusion that this group was mainly produced by vapor fractionation during the chrondule-forming event. The majority of chondrules are enriched in Na but fractionated in K. A separation mechanism via alkali sulfides is suggested for the fractionation of K from Na. It is concluded that the pre-Chainpur matter went through highly reducing conditions before being sampled by the chondrule-forming process. Melting occurred under oxidizing conditions in a dense atmosphere with high partial pressure of volatile elements, leading to a conversion of sulfides into oxides, providing FeO in almost constant amounts, and enriching the chondrules in volatiles compared to bulk chondrite compositions.

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