| 青藏高原西部班公湖蛇绿混杂岩带的基本特征与构造演化 |
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| 引用本文： | 陈奇,谢琳,肖志坚.青藏高原西部班公湖蛇绿混杂岩带的基本特征与构造演化[J].华东地质学院学报,2007,30(2):107-112. |
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| 作者姓名： | 陈奇 谢琳 肖志坚 |
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| 作者单位： | 江西应用技术职业学院 江西赣州341000(陈奇)，江西省地质调查研究院 江西南昌330030(谢琳，肖志坚) |
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| 基金项目： | 中国地质调查局“1∶25万日土县幅、喀纳幅(国内部分)区域地质调查”(200213000008) |
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| 摘 要： | 班公湖蛇绿混杂岩带位于班公湖-怒江结合带西段,是中生代特提斯洋消亡的遗迹。根据西藏1∶25万日土县幅、喀纳幅地质填图成果,将班公湖蛇绿混杂岩带的时空结构划分为南、北两条亚带;综合分析研究认为,本区中特提斯洋的演化经历了三叠纪-早中侏罗世扩张,中晚侏罗世双向俯冲,晚侏罗世-早白垩世残余洋(海)盆和晚白垩世陆(弧)-陆碰撞等构造演化阶段。
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| 关 键 词： | 构造演化 蛇绿混杂岩 中特提斯 班公湖 西藏 |
| 文章编号： | 1000-2251（2007）02-0107-06 |
| 修稿时间： | 2007-04-11 |
Characteristics and Tectonic Evolution of Bangong Lake Ophiolitic Melange Belt in the Western Qinghai-Tibet Plateau |
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| CHEN Qi,XIE Lin,XIAO Zhi-jian.Characteristics and Tectonic Evolution of Bangong Lake Ophiolitic Melange Belt in the Western Qinghai-Tibet Plateau[J].Journal of East China Geological Institute,2007,30(2):107-112. |
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| Authors: | CHEN Qi XIE Lin XIAO Zhi-jian |
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| Institution: | 1. Jiangxi Professional Institute of Applied Technology, Ganzhou, JX 341000, China; 2. Jiangxi Institute of Geological Survey, Nanchang, JX 330030, China |
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| Abstract: | Situated in the western segment of the Bangong-Nujiang junction zone,Bangong Lake ophiolitic melange belt is the relics of subductional collision and extinction of the Mid-Tethyan Ocean. Based the 1:250000 regional geology investigation of Ritu County Sheet and Kana Sheet, the time-space structure of Bangong Lake ophiolitic melange belt is divided into the northern and the southern secondary belt. Four stages are proposed for the tectonic evolution of Mid-Tethyan Ocean in the study area: the stage of Triassic -the Early-Middle Jurassic spreading, the stage of Middle-Late Jurassic subduction of two direction, Late-Jurassic-Early Cretaceous remnant sea basin sedimentation and the stage of Late Cretaceous continent(arc)-continental collision. |
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| Keywords: | tectonic evolution ophiolitic melange Mid-Tethys Bangong Lake Tibet |
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