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language
eng
Author
Orozbaev, Rustam
Description
 The modes of occurrence and chemical compositions of white micas in the eclogites and surrounding country-rock gneisses in the Aktyuz area in Northern Kyrgyz Tien-Shan have been described. In the eclogites, white micas occur in the matrix and as inclusions within garnet and amphibole. They are classified as phengite, paragonite and muscovite. The highest Si contents (6.89-7.14 p.f.u.) are observed in phengite inclusions in garnets and in the cores of matrix phengites. Muscovite (Si = 5.96-6.09 p.f.u) occurs at the outermost rims of the matrix phengites. In the pelitic gneisses, phengites occur in the matrix and as inclusions within garnet, plagioclase and zircon. The cores of the matrix phengites and phengite inclusions within zircons have the highest Si contents of up to 6.83 p.f.u. and 6.88 p.f.u., respectively. The Si contents in the phengites suggest that the eclogites and the country rock gneisses experienced relatively high-pressure metamorphism. The muscovite rims of the matrix phengites indicate relatively low-pressure and high-temperature metamorphic conditions in the eclogites.
Journal Title
島根大学地球資源環境学研究報告
Volume
28
Start Page
37
End Page
49
ISSN
13439774
Published Date
2009-12-25
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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