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华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录
引用本文:张岳桥,徐先兵,贾东,舒良树.华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录[J].地学前缘,2009,16(1):234.
作者姓名:张岳桥  徐先兵  贾东  舒良树
作者单位:中国地质科学院地质力学研究所;南京大学地球科学系;
基金项目:国家自然科学基金项目(40634022)
摘    要:华南地区中生代动力体制经历了从特提斯构造域向滨太平洋构造域的转换,但对这种动力体制转换发生的时间和产生的地质效应则存在不同的认识。通过分析华南印支—早燕山构造层(D—J1-2)广泛发育的褶皱构造,识别了早中生代两个世代褶皱构造的横跨叠加型式,发现早期近东西向褶皱构造具有南北成带、晚期NNE向褶皱构造具有东西分区的区域展布特征。基于地层接触关系和早中生代岩浆岩和火山岩同位素年代学数据统计分析,认为这两组叠加褶皱构造清楚地记录了华南早中生代两期挤压事件,近东西向褶皱是对印支早期华南地块南北边缘碰撞造山事件的远程响应,NNE向褶皱则起源于燕山早期((170±5)Ma)古太平洋板块向华南大陆之下低角度俯冲作用,两者发生转换的时代在中晚侏罗世之交。伴随这两期构造挤压而产生的地壳增厚分别诱发了华夏地块三叠纪和晚侏罗世地壳深熔作用和岩浆侵入活动。华南两组叠加褶皱构造的识别为进一步探讨早中生代从碰撞动力构造体系向俯冲动力构造体系转换提供了关键的构造地质学依据。

关 键 词:华南地块  叠加褶皱  印支期碰撞褶皱体系  早燕山期俯冲褶皱系统  构造动力体制转换

Deformation record of the change from Indosinian collision-related tectonic system to Yanshanian subduction-related tectonic system in South China during the Early Mesozoic
Zhang Yueqiao,Xu Xianbing,Jia Dong,Shu Liangshu.Deformation record of the change from Indosinian collision-related tectonic system to Yanshanian subduction-related tectonic system in South China during the Early Mesozoic[J].Earth Science Frontiers,2009,16(1):234.
Authors:Zhang Yueqiao  Xu Xianbing  Jia Dong  Shu Liangshu
Institution:Zhang Yueqiao1,Xu Xianbing2,Jia Dong2,Shu Liangshu2 1.Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China2.Department of Earth Science,Nanjing University,Nanjing 210093,China
Abstract:It is commonly accepted that tectonic regimes underwent a tremendous change, during the Mesozoic, from the Tethys tectonic domain to the Pacific tectonic domain in South China, although the timing and geological effects of such a change have been debated. This paper identified two generations of superimposed folds that widely develop in Indosinian to early Yanshanian tectonic layer (D-J1-2) in South China, and it is found that the earlier generation of folds is well zonated in W-E and the later one is distr...
Keywords:South China Block  superimposed fold  Indosinian collision-related fold system  Early Yanshannian subduction-related fold system  tectonic regime change  
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