Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1115g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.1115-1126
Physics
6
Scientific paper
Dendritic pyroxene and olivine within intragranular silicate inclusions in natural iron-carbon alloy (~2% C) contain up to 2.7 wt.% P 2 O 5 . The pyroxene and olivine crystallized rapidly in supersaturated silicate liquids, enriched in FeO (13-55 wt.%), TiO 2 (2-5 wt%), and P 2 O 5 (2-4 wt.%), which were trapped as immiscible liquids within iron-carbon liquid. The structural formulae of the pyroxene and olivine indicate that the P substitutes for Si in these minerals, as predicted from theoretical considerations and consistent with rare, previously reported occurrences of P-rich silicates. In the olivine P +5 appears to be charge-balanced by octahedral site vacancies. In the pyroxenes P +5 is probably charge-balanced by coupled substitution with Al +3 or Ti +3 or by octahedral site vacancies. Three factors could possibly have led to the incorporation of these unusually large amounts of P into the structures of these minerals: 1. 1) the high P 2 O 5 contents, coupled with the low SiO 2 contents of the liquids in which they crystallized 2. 2) rapid crystallization from supersaturated liquids 3. 3) low f O 2 . Further studies, particularly experimental, are needed to determine quantitatively how these factors affect P silicate crystal/liquid distribution factors. Phosphorus in the upper mantle (except in local regions, metasomatically enriched in P 2 O 5 ) might occur principally in the structures of pyroxene and olivine, rather than in apatite.
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