| 西藏甲玛-卡军果推-滑覆构造系特征 |
| |
| 关键词:Jiama(Gyama)-Kajunguo thrust-gliding nappe tectonic system structural feature formation mechanism formation age factors controlling rocks and deposits |
| 基金项目:国家973项目(编号: 2011CB403103)；地质调查项目(编号: 1212011221073; 1212011086057)；“十一五”国家科技支撑计划项目(编号: 2006BAB01A04-4; 2006BAB01-05～06) |
|
| 摘要点击次数: 3449 |
| 全文下载次数: 5191 |
| 摘要: |
| Features of Jiama(Gyama)-Kajunguo Thrust-gliding Nappe Tectonic System in Tibet |
| Based on reconnaissance survey and geological mapping as well as comprehensive literature review and laboratory study, this paper presents the following conclusions: Firstly, the Jiama-Kajunguo thrust-gliding nappe tectonic system, which resulted from the Indo-Asia collision, deformed successively from the central part of the basin toward the margin, the new layer overlay the old one, and the greatest deformation occurred around 50 Ma±. Secondly, the footwall block of the nappe is the Yeba group tectonite, the nappe consists of the upper Jurassic and lower Cretaceous carbonate and siliciclastics, the main part that is a complex fold with axial plane trends northward and can be divided into the fore-, mid- and post-parts from south to north structurally. The rock mass was located in the gliding nappe system at the top of the anticlinorium axis due to gravitational disequilibrium, which caused the hanging-wall block overlying the nappe to slip toward the north; the gliding nappe system is also divided into the fore-, mid- and post- parts from the south to the north in this paper. At last, the magmatic activities that induced the ore-forming alteration of the Jiama(Gyama) deposit happened during the releasing stage after the contraction stage of the thrust-gliding nappe tectonic system, and the upward migration of the magma was collaboratively controlled by the NS-trending basement faults and the thrusts. The magmatic rock that was emplaced finally in the fore-part of the thrust-gliding nappe tectonic system experienced multiple structural-magmatic-mineralization superimposition and generated the superlarge Jiama(Gyama) Cu polymetallic deposit. |
| ZHONG Kang-hui,LI Lei,ZHOU Hui-wen,BAI Jing-guo,LI Wei,ZHONG Wan-ting,ZHANG Yong-qiang,LIN Ji-qing,ZHENG Fan-shi,HUANG Xiao-yu,LU Biao,LEI Bo.2012.Features of Jiama(Gyama)-Kajunguo Thrust-gliding Nappe Tectonic System in Tibet[J].Acta Geoscientica Sinica,33(4):411-423. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|