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Occurrence of Fe3+ and formation process of precipitates within oxidized olivine phenocrysts in basalt lava from Kuroshima volcano, Goto islands, Nagasaki, Japan

Published online by Cambridge University Press:  02 January 2018

T. Ejima ,
M. Akasaka ,
T. Nagao  and
H. Ohfuji
T. Ejima*
Affiliation:
Department of Materials Creation and Circulation Technology, Graduate School of Science and Engineering, Shimane University, Matsue 690-8504, Japan Mineral resources research group, National Institute of Advanced Industrial Science and Technology, Tsukuba Central #7, Tsukuba 305-8567, Japan
M. Akasaka
Affiliation:
Department of Materials Creation and Circulation Technology, Graduate School of Science and Engineering, Shimane University, Matsue 690-8504, Japan
T. Nagao
Affiliation:
Department of Earth Sciences, Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi 753-8512, Japan
H. Ohfuji
Affiliation:
Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
*
*E-mail: ejima-t@aist.go.jp
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Abstract

The oxidation state of Fe and precipitates within olivine phenocrysts from an olivine-basalt from Kuroshima volcano, Goto Islands, Nagasaki Prefecture, Japan, were determined using electron microprobe analysis, 57Fe Mössbauer spectroscopy, Raman spectroscopy and transmission electron microscopy, to examine the formation process of the Fe-bearing precipitates.

The average Fo content of the olivine phenocrysts is 76.2 mol.%. The olivine phenocrysts occasionally have precipitate minerals at their rims, especially on rims near vesicles. The 57Fe Mössbauer spectrum of olivine separates consists of two doublets assigned to Fe2+ at the octahedral M1 and M2 sites, and a Fe3+ doublet at the M1 and M2 sites. The Fe2+:Fe3+ ratio is 90(5):10(1). The precipitates at the rims of the olivine phenocrysts consistof magnetite and enstatite showing coaxial relations with host olivine, and grow parallel to the olivine c axis. Moreover, clusters consisting of nanoscale domains of a few tens of nm in size occur in the host olivine. Their rounded form and appearance in transmission electron microscope images are similar to those of the magnetite precipitates, but they have an olivine structure and can be regarded as embryos of magnetite within the olivine.

The oxidation process of olivine phenocrysts under cooling conditions is: (1) formation of magnetite embryos on the rims of olivinephenocrysts; (2) formation of enstatite-like pyroxene domains by depletion of Fe in olivine due to the generation of magnetite embryos; (3) crystallization of magnetite and enstatite-like pyroxene precipitates.

Keywords

olivineprecipitatesoxidation state of Febasalthigh-temperature oxidation57Fe MössbauerHR-TEMRamanKuroshima volcano
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 7 , December 2015 , pp. 1833 - 1848
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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