| 中国南天山造山带蓝片岩及其构造意义 |
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| 引用本文：肖序常,汤耀庆,王军,高俊,赵民.1994.中国南天山造山带蓝片岩及其构造意义[J].地球学报,15(3,4):54-64. |
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| 中文摘要:中国西北部地区发育多条蓝片岩带。其中南天山蓝片岩带东西延伸1000余公里，西部可能与哈萨克斯坦的阿特巴什带（Atabashi）和万利苏（Maylisu）相连，东部可能与我们发现的南天山中部库米什蓝片岩相连。它是古亚洲域最长、最重要的一条高P/T变质带。本文在较系统地对南天山高P/T变质矿物组合、探针分析、同位素测年等数据资料分析研究基础上，认为该带主要为蓝闪石片岩-绿片岩的过渡相。该带与其北侧的高P/T变质岩-混合岩化花岗岩质岩石以及中酸性侵入岩等构成古又变质带。从PTtD轨迹中可以判别439Ma为南天山洋盆俯冲初始变质相，420-415Ma接近峰期，350-345Ma主要为退变质绿片岩相，该岩相为南天山洋盆闭合后抬升阶段的产物。 |
| 中文关键词:南天山 蓝片岩 PTtD轨迹 |
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| Blueschist Belts and Their Tectonic Implications of the S. Tianshan Mts.,N.W.China |
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| Abstract: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. |
| keywords:South Tianshan blueschists PTtD path |
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