Title: Extremely low-Al orthopyroxene in the Horoman peridotite, Japan.
Abstract:We report an occurrence of extremely low-alumina orthopyroxenes in a spinel lherzolite from the Horoman Peridotite Complex, Japan. The low-Al orthopyroxenes occur in two modes; the first occurs at the...We report an occurrence of extremely low-alumina orthopyroxenes in a spinel lherzolite from the Horoman Peridotite Complex, Japan. The low-Al orthopyroxenes occur in two modes; the first occurs at the margin of a large orthopyroxene porphyroclast in contact with olivine and the second occurs at grain boundaries between clinopyroxene and olivine. Al2O3, Cr2O3 and CaO contents in the low-Al orthopyroxenes are less than 0.2 wt.% and are distinctively lower than those in orthopyroxene porphyroclasts. Petrographic observations combined with a inferred P-T history of the Horoman peridotite reveal that the low-Al orthopyroxenes were formed through a very local reaction between peridotite with aqueous fluids, which were not pervasively altering the precursor mineralogy.Read More
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 4
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