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南天山北缘榆树沟麻粒岩的变质作用及其锆石SHRIMP年龄的研究
引用本文:李天福,杨经绥,任玉峰,陈松永,徐向珍.南天山北缘榆树沟麻粒岩的变质作用及其锆石SHRIMP年龄的研究[J].岩石学报,2011,27(1):147-165.
作者姓名:李天福  杨经绥  任玉峰  陈松永  徐向珍
作者单位:中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京 100037;中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京 100037;中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京 100037;中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京 100037;中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京 100037
基金项目:本文受国家自然科学基金创新群体项目(40921001)、中石化集团前瞻性研究项目(YPH08110)和中国地质调查局基础研究项目(1212010610105)联合资助.
摘    要:南天山北缘榆树沟麻粒岩主要为基性麻粒岩,由多个变质程度不同(低、中、高压麻粒岩相)的岩片被构造作用拼贴到一起。本文对不同麻粒岩开展详细的岩相学研究,识别出的变质作用有:进变质角闪岩相、低压麻粒岩相、中压麻粒岩相、高压麻粒岩相和退变质的中压麻粒岩相、角闪岩相、绿片岩相变质作用。对于有成熟温压计的中压麻粒岩相(即Grt-Opx-Cpx-Plg-Qtz组合)矿物组合的样品进行了温压估算,获得的温度和压力范围为724~826℃和0.64~0.88GPa。对原岩为火山岩的中压麻粒岩相岩石的锆石核部的研究表明,锆石的来源复杂;SHRIMP锆石U-Pb年代学测定显示,锆石的变质生成边的年龄稳定,为390~401Ma,代表了中压麻粒岩相进变质作用的时代。

关 键 词:麻粒岩    变质作用    锆石    SHRIMP定年    榆树沟  天山
收稿时间:8/1/2010 12:00:00 AM
修稿时间:2010/12/9 0:00:00

Metamorphism process and SHRIMP dating of granulite at Yushugou, northern margin of South Tianshan
LI TianFu,YANG JingSui,REN YuFeng,CHEN SongYong and XU XiangZhen.Metamorphism process and SHRIMP dating of granulite at Yushugou, northern margin of South Tianshan[J].Acta Petrologica Sinica,2011,27(1):147-165.
Authors:LI TianFu  YANG JingSui  REN YuFeng  CHEN SongYong and XU XiangZhen
Institution:Key Laboratory for Continental Dynamics of the Ministry of Land and Resources; Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Key Laboratory for Continental Dynamics of the Ministry of Land and Resources; Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Key Laboratory for Continental Dynamics of the Ministry of Land and Resources; Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Key Laboratory for Continental Dynamics of the Ministry of Land and Resources; Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Key Laboratory for Continental Dynamics of the Ministry of Land and Resources; Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China
Abstract:Granulite facies terrane along northern boundary of South Tianshan is mainly composed of basic granulites,divided into various slabs of different extents of metamorphism.Careful petrographical observation recognized following metamorphic stages: Progressive metamorphism facies of amphibolite,low-pressure granulite,medium-pressure granulite,high-pressure granulite and retrogressive metamorphism facies of medium-pressure granulite,amphibolite and green schist.Based on a reliable geothermobarometer(Grt-Opx-Cpx...
Keywords:Granulite  Metamorphism  Zircon  SHRIMP dating  Yushugou  Tianshan
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