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Retrograde strontium metasomatism in serpentinite mélange of the Kurosegawa Zone in central Kyushu, Japan

Published online by Cambridge University Press:  05 July 2018

T. Miyazoe ,
M. Enami ,
T. Nishiyama  and
Y. Mori
T. Miyazoe*
Affiliation:
Department of Earth and Planetary Sciences, Nagoya University, Chikusa-Ku, Nagoya 464-8601, Japan Department of Earth and Environment, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8555, Japan
M. Enami
Affiliation:
Department of Earth and Planetary Sciences, Nagoya University, Chikusa-Ku, Nagoya 464-8601, Japan
T. Nishiyama
Affiliation:
Department of Earth and Environment, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8555, Japan
Y. Mori
Affiliation:
Kitakyushu Museum of Natural History and Human History, 2-4-1, Higashida, Yahatahigashi-Ku, Kitakyushu 805-0071, Japan
*
E-mail: [email protected]
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Abstract

Strontium-rich epidote, including epidote-(Sr) and epidote with major amounts of Sr (i.e. epidote containing up to 17.3 wt.% SrO), was found in pumpellyite schist and epidote blueschist in a tectonic block in the serpentinite mélange of the Kurosegawa Zone, central Kyushu, Japan. The tectonic block is 20 m wide and made primarily of lawsonite blueschist, with subordinate amounts of pumpellyite schist and epidote blueschist. The pumpellyite schist typically occurs at the edge of the block and is composed mainly of pumpellyite with subordinate amounts of strontium-poor epidote, albite and chlorite, and thin veins of fine-grained calcite and clinopyroxene. Epidote-(Sr) forms rims around strontium-poor epidote, fills fractures in strontium-poor epidote and also occurs interstitially between pumpellyite aggregates and along the boundaries between pumpellyite and calcite-clinopyroxene veins. The epidote blueschist is found between the pumpellyite schist and lawsonite blueschist, and consists mainly of sodic amphibole, epidote and titanite, with albite veining. Strontium-rich epidote occurs as rims, replacing Sr-poor epidote near the albite vein. The bulk strontium contents of the rocks are as follows: lawsonite blueschist (200 ppm), epidote blueschist (2800 ppm) and pumpellyite schist (~10,700 ppm). The chemical and petrological characteristics of the Sr-rich epidote-bearing metabasites suggest that the infiltration of a metamorphic fluid promoted extensive Sr metasomatism during the later stages of high-pressure metamorphism.

Keywords

strontiumepidotemetasomatismblueschistpumpellyite actinolite facies metamorphism
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 635 - 647
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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