Raman spectroscopic study of a garnetite xenolith from Malaita, Southwest Pacific

Rei Shiraishi, Eiji Ohtani

Research output: Contribution to journalArticle

Abstract

A garnetite xenolith, KC-99-M5, from Malaita Island reported to contain minerals from the mantle transition zone was investigated using micro-Raman spectroscopy and electron probe microanalysis. The xenolith is mainly composed of Ti-bearing pyropic garnet. It contains many amoeboid areas with radiating cracks and veins that suggest fracturing during decompression. The phases in the veins and amoeboid areas are identified as orthopyroxene, clinopyroxene, amphibole, spinel, and plagioclase. High-pressure minerals such as majorite and silicate perovskite were not confirmed in this work. Texture, mineral chemistry, and Raman spectroscopic data indicate that the minerals in the veins and amoeboid areas are the reaction products of primary minerals with the melt from the hosting alnöite magma that penetrated along the cracks.

Original languageEnglish
Pages (from-to)337-345
Number of pages9
JournalJournal of Mineralogical and Petrological Sciences
Volume102
Issue number6
DOIs
Publication statusPublished - 2008 Jan 10

Keywords

  • Garnetite
  • Majorite
  • Raman spectroscopy

ASJC Scopus subject areas

  • Geophysics
  • Geology

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