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藏东八宿地区泛非期花岗岩锆石SHRIMP U-Pb定年
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].地质通报,2008,27(1):64-68.
作者姓名:李才  谢尧武  沙绍礼  董永胜
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
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.
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.

关 键 词:藏东  卡穷花岗岩  泛非期  锆石定年  藏东  八宿  地区  泛非期  花岗岩  锆石  SHRIMP  granite  zircon  dating  新资料  问题  构造演化  青藏高原南部  基底  板块缝合带  怒江  活动记录  岩浆  事件  年龄
文章编号:1671-2552(2008)01-0064-05
收稿时间:2007-06-29
修稿时间:2007-11-21

SHRIMP U-Pb zircon dating of the Pan-African granite in Baxoi County, eastern Tibet, China
LI Cai,XIE Yao-wu,SHA Shao-li,DONG Yong-sheng.SHRIMP U-Pb zircon dating of the Pan-African granite in Baxoi County, eastern Tibet, China[J].Geologcal Bulletin OF China,2008,27(1):64-68.
Authors:LI Cai  XIE Yao-wu  SHA Shao-li  DONG Yong-sheng
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.
Keywords:eastern Tibet  Kaqiong granite  Pan-African  zircon dating
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