三江造山带后碰撞断裂构造带的结构与演化：以新生代剑川—兰坪盆地为例

三江造山带后碰撞断裂构造带的结构与演化：以新生代剑川—兰坪盆地为例

刘俊来1, 王安建2, 曹殿华2, 修群业2

1. 中国地质大学地球科学与资源学院岩石圈演化与矿产资源重点实验室，北京 100083; 2.中国地质科学院矿产资源战略研究中心，北京 100037

收稿日期:2004-12-20 修回日期:2004-12-20 出版日期:2004-12-20 发布日期:2004-12-20

Structure and Evolution of the Post-Collisional Fault Structures in the Three River Orogenic Belt, Exemplified by the Cenozoic Jianchuan-Lanping Basin

LIU Jun-lai1, WANG An-jian2, CAO Dian-hua2, XIU Qun-ye2

1. College of Earth Sciences and Mineral Resources/Lithosphere Evolution and Mineral Resources Laboratory, China University of Geosciences, Beijing 100083, China; 2. Strategic Research Center of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received:2004-12-20 Revised:2004-12-20 Online:2004-12-20 Published:2004-12-20

摘要/Abstract

摘要： 三江造山带作为调节印度一欧亚板块间的碰撞及后碰撞过程的重要构造带，具有长期多阶段复杂演化过程。在剑川—兰坪新生代盆地发育的澜沧江断裂带、中轴断裂带和乔后断裂带是三江造山带不同时期演化的具体体现。它们在产状、组成和特点等方面有着显著的差异。构造分析表明，澜沧江断裂带与印度—欧亚岩石圈板块间的早期碰撞过程密切相关，它制约着剑川—兰坪盆地的发育；乔后断裂带和中轴断裂带对于剑川—兰坪盆地具有强烈的改造作用，是后碰撞调解过程的结果。三江造山带对于印度—欧亚板块间碰撞的调解过程，包括了水平侧向逃逸与垂向物质蠕散。在剑川—兰坪地区，前者表现为乔后断裂早期阶段右行走滑作用产生了大约90km的走向错移，而后者形成了广布于中轴断裂内遍布的小型逆冲构造和乔后断裂西部的大量逆冲和推覆体构造。

Abstract: The Jianchuan-Imnping Cenozoic basin is located in the Three River orogenic belt，an important tectonic belt generated during collisional or post-collisional processes due to India-Asia interaction．There are several fault zones in the basin and adjacent areas，including the Lancangjiang fault zone，the Central axis fault zone and the Qiaohou fault zone．The N-S extending Lancangjiang fault zone is characterized by occurrence of mylonites and strongly foliated granitic rocks and meta-sedimentary rocks．Foliations dip steeply either to the east or to the west with stretching lineations in the direction along their strikes．Shear sense indicators in tectonites suggest a left-lateral shear during mylonitizartion along the fault zone，The Central axis fault zone is a zone of brittle fractures in N-S direction．The fracture surfaces mainly dip to the west with dip angles varying from 0。to 90。．The shallowly dipping surfaces often cut across those with high angles form thrusts and nappe structures at different scales．Qiaohou fault zone dipping to the NNE with dip angles mainly of 60。-70。to the east is the northern extension of the Ailaoshan－Red River fault zone．Evidences for both strike-slip faulting and thrusting are obvious along the fault zone．

刘俊来, 王安建, 曹殿华, 修群业. 三江造山带后碰撞断裂构造带的结构与演化：以新生代剑川—兰坪盆地为例[J]. J4.

LIU Jun-lai1, WANG An-jian2, CAO Dian-hua2, XIU Qun-ye2. Structure and Evolution of the Post-Collisional Fault Structures in the Three River Orogenic Belt, Exemplified by the Cenozoic Jianchuan-Lanping Basin[J]. J4.