Crystal chemistry of iron in two styles of metasomatism in the upper mantle

Details Crystal chemistry of iron in two styles of metasomatism in the upper mantle Crystal chemistry of iron in two styles of metasomatism in the upper mantle

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2579d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 6, pp.2579-2586

Computer Science

10

Scientific paper

Redox characteristics and crystal chemical changes caused by Fe-Ti metasomatism are evident in an anhydrous composite nodule from Kilboume Hole, New Mexico. Data collected using electron microprobe and Mössbauer spectroscopy show that olivines have no evidence of Fe-oxidation from metasomatism, although changes in Fe 2+ Mg 2+ exchange and Fe 2+ ordering are observed in the peridotite with distance from the dike contact. Orthopyroxenes exhibit constant Fe 3+ / Fe ratios at all distances from the dike, although the proportion of Fe 2+ in sites with trivalent neighbors and total Fe decrease with increasing distance from the contact. Iron valence and occupancy remain fairly constant for clinopyroxene, in which the dominant metasomatic change is a Tschermak substitution of Al for Si and Mg. Spinel displays constant values of Fe 3+ / Fe and total iron, but grains near the dike contact have high Mg and Al contents. These results contrast with analogous studies of composite xenoliths which show evidence of hydrous metasomatism. The data suggest that hydrous modal metasomatism may be related to conditions of higher f o 2 than may be produced by melts that do not form new minerals.

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