Calcium zoning in olivine and its relationship to silica activity and pressure

Details Calcium zoning in olivine and its relationship to silica activity and pressure Calcium zoning in olivine and its relationship to silica activity and pressure

Aug 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1815s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 8, pp.1815-1821

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21

Scientific paper

Microprobe analyses of olivine phenocrysts from nephelinite and basanite lavas show strong zoning toward calcium enrichment. Tholeiitic and other more siliceous lavas show little or no such calcium enrichment, but more extensive magnesium to iron zoning. Consideration of reactions between clinopyroxene and olivine indicate that silica activity as well as pressure is an important variable. Zoning trends toward calcium enrichment in olivine could be interpreted as a response to pressure release during crystallization. A normal, magnesium to iron, trend with no increase in calcium would, then, reflect crystallization with stable pressure conditions.

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