| 摘要: |
| 本文根据1:25万地质填图成果,将班公湖-怒江结合带西段弧-盆系时空结构自北向南划分为五峰尖-拉热拉新晚侏罗世—早白垩世陆缘火山-岩浆弧带、班公湖蛇绿混杂岩北、南亚带和昂龙岗日-班戈白垩纪—始新世岩浆弧带等,初步认为中特提斯洋经历了三叠纪—早侏罗世扩张,中—晚侏罗世往北、南双向俯冲,晚三叠世—早白垩世残余洋(海)盆和早—晚白垩世陆-弧(陆)碰撞等演化阶段。 |
| 关键词: 班公湖-怒江结合带 中特提斯 多岛弧-盆系 构造演化 西藏 |
| DOI： |
| 附件 |
| 投稿时间：2006-08-21 |
| 基金项目:中国地质调查局“1:25万邦多区幅、措麦区幅、羌多幅、日土县幅、喀纳幅(国内部分)区域地质调查”。 |
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| The archipelagic arc tectonic evolution of the Meso-Tethys in the western part of the Bangong Lake-Nujiang suture zone |
| CAO Sheng-hua, DENG Shi-quan, XIAO Zhi-jian, LIAO Liu-gen |
(1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China;
2. Jiangxi Institute of Geological Survey, Nanchang 330030, Jiangxi, China) |
| Abstract: |
| The spatial-temporal framework of the arc-basin systems in the western part of the Bangong Lake-Nujiang suture zone may be divided, from north to south on the basis of the results of the 1:250 000 geological mapping, into the Wufengjian-Larelaxin Late Jurassic-Early Cretaceous epicontinental volcanic-magmatic arc zone, northern and southern subzones of the Bangong Lake ophiolitic mélange zone, and Nganglong Kangri-Baingoin Cretaceous-Eocene magmatic arc zone. The Meso-Tethyan Ocean once went through the Triassic-Early Jurassic spreading, Middle-Late Jurassic northward and southward bidirectional subduction, Late Triassic-Early Cretaceous residual ocean (sea)basin and Early-Late Cretaceous continent-arc (continent)collision. |
| Key words: Bangong Lake-Nujiang suture zone Meso-Tethys archipelagic arc-basin system tectonic evolution Xizang |
