Polymetamorphism of Aktyuz eclogites (northern Kyrgyz Tien-Shan) deduced from inclusions in garnets
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- OROZBAEV Rustam T.
- Department of Geoscience, Shimane University
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- TAKASU Akira
- Department of Geoscience, Shimane University
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- TAGIRI Michio
- College of Science, Ibaraki University
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- BAKIROV Apas B.
- Institute of Geology, Kyrgyz National Academy of Science
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- SAKIEV Kadyrbek S.
- Institute of Geology, Kyrgyz National Academy of Science
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Abstract
Garnet and omphacite in eclogites from the Aktyuz area, northern Kyrgyz Tien-Shan, preserve evidence of two distinct metamorphic events. Relic polyphase inclusions of Fe-rich staurolite (XMg < 0.29), Mg-taramite, paragonite, and oligoclase (An < 16) contained in garnet cores represent a separate pre-eclogitic amphibolite or epidote-amphibolite facies metamorphism (T = 560-650 °C, P = 4-10 kbar). This relatively low- to medium-pressure metamorphic event probably resulted from the heat of the hot hanging wall at the inception of subduction. Inclusions in the garnet cores and rims and matrix omphacite (glaucophane, sodic-calcic and calcic amphiboles, paragonite, phengite, epidote, albite, rutile, hematite, and quartz) suggest that epidote-blueschist facies conditions (T = 330-570 °C, P = 8-16 kbar) were experienced during the prograde stage of the eclogitic metamorphism. This event occurred within a subduction zone. The estimated peak metamorphic conditions of the eclogites are T = 600-710 °C and P = 15-25 kbar. The subsequent retrograde path through epidote-amphibolite and greenschist facies suggests a clockwise P-T path, in contrast to the anticlockwise P-T path proposed by previous work.
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 102 (2), 150-156, 2007
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390001206545864704
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- NII Article ID
- 10018419236
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- NII Book ID
- AA11460926
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- BIBCODE
- 2007JMPeS.102..150O
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- COI
- 1:CAS:528:DC%2BD2sXmtlSrurg%3D
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- ISSN
- 13493825
- 13456296
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed