Finding of prehnite-pumpellyite facies metabasites from the Kurosegawa belt in Yatsushiro area, Kyushu, Japan

Common occurrence of prehnite and pumpellyite is newly identified from metabasites of Tobiishi sub-unit in the Kurosegawa belt, Yatsushiro area, Kyushu, where Ueta (1961) had mapped as a greenschist facies area. Prehnite and pumpellyite are closely associated with chlorite, calcite and quartz, and t...

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Bibliographic Details
Published in:Journal of Mineralogical and Petrological Sciences 2012, Vol.107(2), pp.99-104
Main Authors: KAMIMURA, Kenichiro, HIRAJIMA, Takao, FUJIMOTO, Yoshiyuki
Format: Article
Language:English
Subjects:
Belts
Calcite
Chlorites
Iron
Kurosegawa belt
Lawsonite-blueschist facies
Prehnite-pumpellyite facies
Quartz
Veins
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Summary:Common occurrence of prehnite and pumpellyite is newly identified from metabasites of Tobiishi sub-unit in the Kurosegawa belt, Yatsushiro area, Kyushu, where Ueta (1961) had mapped as a greenschist facies area. Prehnite and pumpellyite are closely associated with chlorite, calcite and quartz, and they mainly occur in white colored veins or in amygdules in metabasites of the relevant area, but actinolite and epidote are rare in them. Pumpellyite is characterized by iron-rich composition (7.2-20.0 wt% as total iron as FeO) and its range almost overlaps with those in prehnite-pumpellyite facies metabasites of Ishizuka (1991). These facts suggest that the metabasites of the Tobiishi sub-unit suffered the prehnite-pumpellyite facies metamorphism, instead of the greenschist facies.
ISSN:1345-6296
1349-3825
DOI:10.2465/jmps.111020c