| 中国南天山造山带蓝片岩及其构造意义 |
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| 关键词:South Tianshan blueschists PTtD path |
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| Blueschist Belts and Their Tectonic Implications of the S. Tianshan Mts.,N.W.China |
| There are several blueschist belts in NW china.Among thrn,S. Tianshan blueschist belt is probably the most important,which extends for about 1000km,to the west,may connect with the Atbashi and Maylisu blueschist in Kazahstan,and to the east,may connect with the Kumeshi blueschist that we found last year in the middle segment of the S.Tianshan Mts.We conclude that S.Tianshan blueschist belt is mainly composed of glaucophane-greenschist facies on the base of studying its H.P/T metamorphism,mineral assemblages and isotopic dating. To the north of this belt,there occur a Low P/T belt,together with S.Tianshan blueschist belt,constituting the paired metamorphic belt.The PTtD path of S.Tianshan blueschist belt indicates that during the closing of the S.Tianshan Ocean Basin (439Ma)，the prograde metamorphism occurred and fromed the glaucophane schist facies.420-425Ma is mearly the temperature-pressure peak,and after the cessation of subduction,blueschist subjected to decompression and retrograde metamorphism and transferred to the blueschist-greenschist facies. |
| XIAO Xu-chang,TANG Yao-qing,WANG Jun,GAO Jun,ZHAO Min.1994.Blueschist Belts and Their Tectonic Implications of the S. Tianshan Mts.,N.W.China[J].Acta Geoscientica Sinica,15(3,4):54-64. |
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