天然气地质学

藏东南三江地区浅层构造变形的运动学分析

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  • 1.中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.中国科学院研究生院,北京 100049
苏龙(1975-),男,甘肃临洮人,博士研究生,主要从事沉积盆地油气地质与构造地质研究.

收稿日期: 2009-05-07

  修回日期: 2009-07-24

  网络出版日期: 2010-02-10

基金资助

国家重点基础发展计划(“973”)项目(编号:2005CB422101)资助.

Kinematics Analysis to Shallow Structural Deformation in Sanjiang Region of Southeast Tibet

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  • 1.Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences, Lanzhou 730000,China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2009-05-07

  Revised date: 2009-07-24

  Online published: 2010-02-10

摘要

在新生代青藏高原隆升过程中,印度板块与欧亚板块碰撞挤压导致陆壳块体沿藏东南大型走滑断裂侧向挤出,该“碰撞挤出”模式合理地解释了三江地区新生代强烈的走滑活动。但是对三江地区复杂的逆冲褶皱变形、多期构造变形叠加方式及浅层构造变形的动力学机制还缺乏相应研究。通过考察横穿三江地区盆山单元的地质剖面,将该区浅层构造变形划分为挤压和剪切2种力学类型,并对各种变形特征进行分期、配套,得到印支期以来的叠加过程,从而探讨其动力学机制的转换,并提出新生代后期遍布全区的小型走滑断裂的运动学模型。

本文引用格式

苏龙, 杨鑫, 刘兴旺, 郑建京 . 藏东南三江地区浅层构造变形的运动学分析[J]. 天然气地球科学, 2010 , 21(1) : 117 -124 . DOI: 10.11764/j.issn.1672-1926.2010.01.117

Abstract

During the uplift of Tibetan plateau, the collision of Indian plate and Europe-Asian plate led to continental crust blocks' extrusion along large-scale strike-slip faults. We used the model of collision extrusion to reasonably explain the Cenozoic intensive strike-slip active. But it was paid less attention to the study of complex thrust-folding deformations,multi-phase structural deformational overlay pattern and dynamical mechanism of shallow structural deformation. After investigating the transverse section through the basin-orogen units, we divided shallow structural deformation of Sanjiang region into extruding and shearing mechanical types, and found out the time and form for the different structural deformation. Then the folding history was gotten after Indo-China epoch era. Finally, we proved the conversion of dynamical mechanisms and put forward the kinematical model of small-size strike-slip faults which distribute the whole area in late Cenozoic.

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