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language
eng
Author
Kabir, Md. Fazle
Kainuma, Masaaki
Description
The Sambagawa metamorphic belt in the Bizan area consists mainly of pelitic schists, basic schists, and siliceous schists (garnet-aegirine-augite schists), along with minor garnet glaucophane schists. The garnet?aegirine-augite schists consist mainly of quartz and phengite, with minor amounts of amphibole (ferroglaucophane, magnesioriebeckite, riebeckite, Mg-katophorite, winchite, barroisite, ferrobarroisite), garnet, aegirine-augite and albite. Hematite, chlorite, epidote, calcite and titanite occur, occasionally phengites are found in eight modes of occurrence; phengites as inclusions in porphyroblastic garnet (Ph1), amphibole (Ph2), clinopyroxene (Ph3) and albite (Ph4), phengites (Ph5) occurring in the matrix, and phengites as a secondary mineral replacing porphyroblastic garnet (Ph6), amphibole (Ph7) and clinopyroxene (Ph8) along their rim and crack. The diversity of the modes of occurrence and chemical compositions of the phengites reflects two metamorphic events in the garnet-aegirine-augite schists in the Bizan area. Inclusions in garnet (Ph1), amphibole (Ph2) and clinopyroxene (Ph3) and schistosity-forming phengites (Ph5) are representative of the prograde to the peak metamorphism of the eclogitic metamorphic event. Phengites replacing garnet (Ph6), amphibole (Ph7) and clinopyroxene (Ph8) and phengites inclusions in porphyroblastic albites (Ph4) suggest another high-pressure epidote-amphibolite metamorphic event.
Subject
Sambagawa (Sanbagawa) metamorphic belt
Bizan area
garnet
aegirine-augite
phengite
Journal Title
島根大学地球資源環境学研究報告
Volume
34
Start Page
21
End Page
30
ISSN
13439774
Published Date
2016-03-05
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学大学院総合理工学研究科地球資源環境学教室
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
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