Compositional heterogeneity of olivine in thermally metamorphosed serpentinite from Southwest Japan

Research output: Contribution to journalArticle

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Abstract

Compositionally heterogeneous crystals of olivine occur in thermally metamorphosed serpentinites from Southwest Japan. They have a variation in forsterite (Fo) content up to 10 mo1% within a specimen. The chemical heterogeneity is the result of two causes: the intermingling of metamorphic neoblasts with relict crystals of primary olivine, and the compositional variation within the neoblasts themselves. The metamorphic olivine in each specimen shows a bimodal distribution of Fo content with a highly magnesian group (Fo93-98, varying among specimens) and a relatively ferroan one (Fo85-94). Textural relationships and the variation of NiO and FeO contents between the two groups of olivine suggest that the heterogeneity results from the local involvement of magnetite and awaruite in dehydration reactions of serpentine at the initial stages of metamorphism.

Original languageEnglish
Pages (from-to)1377-1384
Number of pages8
JournalAmerican Mineralogist
Volume88
Issue number8-9
Publication statusPublished - Aug 2003

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serpentinite
olivine
Japan
forsterite
crystal
Ferrosoferric Oxide
Crystals
Dehydration
dehydration
magnetite
crystals
metamorphism
causes

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Compositional heterogeneity of olivine in thermally metamorphosed serpentinite from Southwest Japan. / Nozaka, Toshio.

In: American Mineralogist, Vol. 88, No. 8-9, 08.2003, p. 1377-1384.

Research output: Contribution to journalArticle

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