Computer Science
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1035h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.1035-1036
Computer Science
17
Scientific paper
Chrome-spinels in the stratiform complex of Rhum, Scotland, have compositions that lie along two reaction trends, with the composition of a given crystal being determined by its local environment. Crystals in chrome-spinel rich seams between allivalite and peridotite, or disseminated in adcumulates of allivalite or peridotite, have compositions defining a reaction trend involving a marked change in the Cr / Al ratio and little variation in Fe 3+ (Al-trend). Chrome-spinel crystals in cumulates that contain crystallized trapped liquid, define a reaction trend involving a marked change in Fe 3+ (Fe-trend). Evidence is presented to show that the Al-trend results from reaction of cumulus chromite, cumulus olivine and either plagioclase or a liquid rich in the plagioclase component, whereas the Fe-trend results from reaction of only cumulus chromite and trapped liquid. Some of the implications of these findings are discussed.
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