Elemental composition of mineral constituents from Adhi Kot EH4 chondrite

Physics

Scientific paper

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Chemical Composition, Abundance, Chondrites, Grain Size, Cobalt, Nickel, Iridium

Scientific paper

In the present paper the results of elemental abundances in different grain-sized main mineral fractions of enstatite chondrite Adhi Kot are reported. The fractions were isolated by methods of physical separation and their elemental composition was determined by instrumental neutron activation analysis. We show the average elemental enrichment factors relative to CI chondrite for 14 separate unmagnetic fractions. The enrichment factors of siderophile Co, Ni, Ir, and Au in all fractions are less than 1. The enrichment factors of refractory lithophile element Sc in all fractions are also 1, but the factors of Hf = (9.3-87.5) x CI. The mineral fractions of Adhi Kot meteorite have Hf/Sc (0.149-4.5) and Sm/Sc (0.028-0.137) ratios much greater than cosmic. The 14 mineral fractions of Adhi Kot EH4 meteorite are enriched in the eight refractory elements Ca, Sc, Hf, La, Sm, Eu, Yb, Lu by a mean factor of 3.72 relative to their abundances in CI chondrites, supporting the opinion that they are samples of high-temperature condensates from the solar nebula.

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