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, 0(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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Affiliation: | 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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