Journal
JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES
Volume 104, Issue 2, Pages 77-81Publisher
JAPAN ASSOC MINERALOGICAL SCIENCES
DOI: 10.2465/jmps.081022e
Keywords
UHP metamorphism; EPMA monazite dating; Kyrgyz Tien-Shan; Makbal Complex
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Funding
- International Science and Technology Center (ISTC) [712]
- Japan Society for the Promotion of Science [17340]
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The Makbal Formation of the Northern Kyrgyz Tien-Shan consists mainly of phengite-quartz schists (meta-quartzite), garnet-chloritoid-talc schists and marbles, all of which contain lenses of amphibolites and eclogites. The garnet-chloritoid-talc schists from the Makbal complex underwent UHP metamorphism. The mineral assemblage of the UHP stage is garnet + chloritoid + talc + phengite + rutile + coesite +/- glaucophane +/- florencite +/- monazite +/- apatite. Electron microprobe analyses of monazites from the garnet-chloritoid-talc schists provide two similar CHIME ages. Monazites occurring in the matrix of the schists yield an age of 481 +/- 26 Ma, and monazite inclusions in porphyroblastic garnets yield an age of 480 +/- 56 Ma. These two ages are essentially the same within error, and suggest the peak UHP metamorphism in the Makbal area of the Northern Kyrgyz Tien-Shan occurred at similar to 480 Ma.
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