Complementary REE patterns in spatially associated Ca, Al-rich inclusions from the CV3 chondrite Efremovka

Details Complementary REE patterns in spatially associated Ca, Al-rich inclusions from the CV3 chondrite Efremovka Complementary REE patterns in spatially associated Ca, Al-rich inclusions from the CV3 chondrite Efremovka

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.515p&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 515

Other

2

Aluminum Compounds, Calcium Compounds, Chondrites, Inclusions, Rare Earth Elements, Spatial Distribution, Chemical Composition, Olivine, Spinel, Volatility

Scientific paper

Efremovka, together with Vigarano and Leoville, is a member of the reduced subgroup of CV3 chondrites. Their chondrules, Ca, Al-rich inclusions (CAIs), and single olivine grains have suffered less nebular alteration than those in meteorites of the oxidated subgroup (Allende, Arch, Bali, Grosnaja). The contents of volatiles and of FeO in chondrules and refractory inclusions in oxidized subgroup meteorites are much higher than in reduced subgroup meteorites. The latter are therefore better candidates for studying the record of high-temperatures nebular processes. Inclusions in reduced subgroup meteorites are, however, studied much less than Allende CAIs. Ten CAIs from Efremovka were analyzed by Instrumental Neutron Activation Analysis (INAA). Sections were prepared and analyzed by EMP (Heidelberg) and IMP (St. Louis). Most inclusions are enriched in W, and to a lesser degree, in Mo compared to other refractory metals, in agreement with an earlier analysis of a fine-grained Efremovka inclusion. It is possible that super-refractory condensation occurred at slightly oxidizing conditions, resulting in incomplete condensation of W and Mo. The uncondensed fractions of both elements were then incorporated in later condensing phases. This event must have occurred at high temperatures before condensation of Na and other volatiles. The opposite, occasional loss of W and Mo and high contents of volatiles is characteristic of Allende and other CV3s of the oxidized sub-group. The W and Mo depletions and/or enrichments are apparently decoupled from volatile-element enrichment. Refractory lithophile element patterns in most Efremovka inclusions show some affinity with group II patterns as, for example, reflected in higher-than-chondritic La/Lu ratios.

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