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New occurrence and characterization of Ni-serpentines in the Kwangcheon area, Korea

Published online by Cambridge University Press:  09 July 2018

Y. Song ,
H-S. Moon  and
H-T. Chon
Y. Song
Affiliation:
Department of Geology, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seou1120-749
H-S. Moon
Affiliation:
Department of Geology, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seou1120-749
H-T. Chon
Affiliation:
Department of Mineral Petroleum Engineering, Seoul National University, Seoul 151-742, Korea
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Abstract

Pecoraite and nepouite, Ni-serpentines, occur in the serpentinized ultramafic rocks in the Kwangcheon area, Korea, where the parent rock is classified as harzburgite and/or lherzolite. Pecoraite was precipitated twice from the solution; the early-formed pecoraite coexists with magnetite, millerite, and polydymite both in the Buk- and Nam-sites, while the late-formed pecoraite appears as well-grown colloform and opaque-free phase only in the Buk-site. The typical colloform texture of the late-formed pecoraite strongly indicates that it was precipitated from the solution in supergene conditions. Pecoraite is characterized by its extremely high Ni content and the difference in Fe content between the early- and late-formed pecoraite. Nepouite is distinguished from pecoraite by its prismatic morphology and the large degree of isomorphous substitution between Ni and Mg. The phase relations among coexisting magnetite-millerite-polydymite assemblage with the early-formed pecoraite suggest that the pecoraite might have precipitated in the extremely limited fO2 and fs2 environment from the highly Ni-concentrated solutions and is stable at 25°C and 1 bar.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 3 , September 1995 , pp. 211 - 224
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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