Phosphates in iron and pallasite meteorites

Details Phosphates in iron and pallasite meteorites Phosphates in iron and pallasite meteorites

May 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..459o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 5, pp.459-460

Physics

10

Scientific paper

The ferrous (manganous) orthophosphates, sarcopside and graftonite (both calcium-free) have been found in four fine octahedrites (Bella Roca, Chupaderos, Sam's Valley, Verkhne Dnieprovsk). They coexist with schreibersite, troilite and metal. Calculations of P ( O 2 ) - T for reactions relating these phases show that the presence of these phosphates presents no inconsistency with respect to the degree of reduction encountered in iron meteorites. Similar calculations for magnesium orthophosphate (farringtonite) indicate that the pallasite in which it occurs is somewhat more reduced than the octahedrites. These phosphate-bearing irons suggest a degree of oxidation close to that of common chondrites.

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