| 藏东八宿地区泛非期花岗岩锆石SHRIMP U—Pb定年 |
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| 引用本文： | 李才,;谢尧武,;沙绍礼,;董永胜.藏东八宿地区泛非期花岗岩锆石SHRIMP U—Pb定年[J].中国区域地质,2008(1):64-68. |
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| 作者姓名： | 李才 ;谢尧武 ;沙绍礼 ;董永胜 |
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| 作者单位： | [1]吉林大学地球科学学院,吉林长春130061; [2]西藏地勘局区域地质调查大队,西藏堆龙德庆8514000; [3]云南省地勘局第三地质大队,云南大理671000 |
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| 基金项目： | 国家自然科学基金项目（编号：40672147）与中国地质调查局项目（编号：200113000065）联合资助. 致谢：锆石样品制备、SHRIMP定年得到中国地质科学院地质研究所北京离子探针中心刘敦一、闫全人研究员的指导,北京大学物理学院陈晶老师协助锆石阴极发光照相,审稿人提出了宝贵的修改意见.在此一并致以诚挚的谢意. |
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| 摘 要： | 卡穷细粒黑云母碱长花岗岩出露于藏东八宿县同卡地区，是藏东地区首次发现的泛非期花岗岩。卡穷微陆块呈岩片状夹持于班公湖-怒江缝合带内．卡穷岩群构成卡穷微陆块的主体，卡穷岩群是由花岗岩、花岗片麻岩、黑云斜长片麻岩、大理岩、黑云斜长变粒岩、退变榴辉岩等组成的构造地质体。卡穷细粒黑云母碱长花岗岩获得的锆石SHRIMPU—Pb年龄为507Ma±10Ma，为泛非事件的岩浆活动记录．进一步证实班公湖-怒江板块缝合带以南是泛非期基底．为解决青藏高原南部的构造演化问题提供了新资料。
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| 关 键 词： | 藏东 卡穷花岗岩 泛非期 锆石定年 |
SHRIMP U-Pb zircon dating of the Pan-African granite in Baxoi County,eastern Ti-bet China |
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| Institution: | LI Cai, XIE Yao-wu, SHA Shao-li, DONG Yong-sheng(1. College of Earth Sciences, Jilin University, Changehun 130061, Jilin, China; 2. Regional Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Doilungdeqen 851400, Tibet, China; 3. No.3 Geological Party, Yunnan Bureau of Geology and Mineral Exploration and Development, Dali 671000, Yunnan, China) |
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| Abstract: | The Kaqiong fine-grained biotite-alkali feldspar granite exposed in the Tonggar area, Baxoi County, eastern Tibet, is Pan- African granite that was for the first time found in eastern Tibet. The Kaqiong Group-complex is composed of granite, granite gneiss, biotite plagiogneiss, marble, biotite-plagioclase fine-grained gneiss and retrograded eclogite. It is the main part of the Kaqiong microblock that occurs as a sheet sandwiched between the Bangong Co-Nujiang suture zone. The Kaqiong fine-grained biotite-alkali feldspar granite, which has a SHRIMP U-Pb zircon age of 507＋10 Ma, is the record of magmatic activity during Pan-African orogeny and further verifies that the area south of the Bangong Co-Nujiang suture is the Pan-African basement. This study provides new information for the tectonic evolution of the southern Qinghai-Tibet plateau. |
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| Keywords: | eastern Tibet Kaqiong granite Pan-African zircon dating |
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