Chromian spinel lamellae in olivine from the Iwanai-dake peridotite mass, Hokkaido, Japan

Details Chromian spinel lamellae in olivine from the Iwanai-dake peridotite mass, Hokkaido, Japan Chromian spinel lamellae in olivine from the Iwanai-dake peridotite mass, Hokkaido, Japan

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..39..267a&link_type=abstract

Earth and Planetary Science Letters, Volume 39, Issue 2, p. 267-273.

Physics

6

Scientific paper

Lamellar inclusions of chromian spinel (Cr/Cr + Al > 0.7), clinopyroxene and chromian spinel-clinopyroxene symplectite occur in olivines from alpine-type peridotites which have equilibrated at relatively low temperature (<700°C). They occur most commonly in dunite with very magnesian olivine (Fo93 to Fo95) and discrete grains of Cr-rich spinel. Olivine which initially equilibrated with magnesian and Cr-rich liquid had contained small amounts of calcium and trivalent chromium in the octahedral site, and lamellar chromian spinel and diopsidic clinopyroxene exsolved during the annealing process. The ordinary depletion of chromium or absence of chromian spinel lamellae in olivines in igneous rocks may be partly due to the effective exclusion of chromium from olivine upon cooling.

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