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GEOREF RECORD

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

T. Miyazoe, M. Enami, T. Nishiyama and Y. Mori
Retrograde strontium metasomatism in serpentinite melange of the Kurosegawa Zone in central Kyushu, Japan
Mineralogical Magazine (June 2012) 76 (3): 635-647

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 melange 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 (approximately 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.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 76
Serial Issue: 3
Title: Retrograde strontium metasomatism in serpentinite melange of the Kurosegawa Zone in central Kyushu, Japan
Affiliation: Nagoya University, Department of Earth and Planetary Sciences, Nagoya, Japan
Pages: 635-647
Published: 201206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 27
Accession Number: 2012-092174
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
N32°15'00" - N32°34'60", E130°30'00" - E131°48'00"
Secondary Affiliation: Kumamoto University, JPN, JapanKitakyushu Museum of Natural History and Human History, JPN, Japan
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201248
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