燕山板内造山带早期构造变形演化——以辽西凌源太阳沟地区为例  

On Yanshan intraplate orogene: An example from Taiyanggouarea, Lingyuan, western Liaoning Province, Northeast China

作　　者：胡健民[1] 刘晓文[2] 赵越[1] 徐刚[1] 刘健[1] 张拴宏[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]国土资源部实物地质资料中心,河北三河065201

出　　处：《地学前缘》2004年第3期255-271,共17页Earth Science Frontiers

基　　金：国家自然科学基金重点资助项目 (4 0 1 32 0 2 0 )

摘　　要：燕山地区位于华北板块的东北部 ,自晚古生代华北板块与蒙古板块的拼合后 ,燕山地区进入板内构造演化阶段。以往燕山造山带的研究主要集中于中侏罗世开始的燕山运动 ,而对已经发现的印支期构造的详细研究比较缺乏。通过对辽西凌源太阳沟地区进行详细的构造解剖分析和大比例尺地质填图 ,揭示出在晚三叠世到早侏罗世期间 ,该区经历了三次重要的构造变形。即晚三叠世到早侏罗世早期 ,发育由东往西逆冲的后展式逆冲推覆 ,早侏罗世晚期由西往东逆冲的前展式逆冲推覆和早侏罗世晚期崩塌滑覆构造。三期构造变形显示了燕山造山带早期构造的非极性演化特征 ,也显示了燕山地区的快速抬升和剥露过程。短时期内三期逆冲构造推覆方向的反转 ,显示了板内变形的特征 ,结合已经确定的变形时代及构造指向 。Yanshan area is located in the northeast of north China plate. After the collision of north China plate with Mongolian plate at the Late Paleozoic, Yanshan has stepped into an intraplate structure evolution stage. Former Yanshan orogene studies were mainly focused on Yanshan Movement started at the Middle Jurassic. It is relatively lack of detailed study on already discovered Indosinian structure. Based on a thorough structural investigation and analyses and large-scale mapping in Taiyanggou area, Linyuan, western Liaoning Province of China, the authors discover that there were three major structure deformations in this area from the Late Triassic to the Early Jurassic. From the Late Triassic to the beginning of the Early Jurassic, the overstep propagation thrust structure and thrusting nappe structures developed from east to west. At the rest of the Early Jurassic, the progressive propagation thrusting nappe structures developed from west to east, followed (accompanied) by the sliding decollement structure. The three deformations display a non-polarity evolution characteristic for the early Yanshan orogene structure, and recorded a fast uplifting and stripping process. The reversing of these three thrusting direction in a short time shows an intraplate deformation characteristic. Combining with the determined deformation ages and structure directions, the authors believe that these early deformations were correlated with and might have been the response of the tectonic evolution of the Early Jurassic Qinling-Dabie collision orogene, and of the Jurassic and Cretaceous Mongolian-Orhesk suture.

关 键 词：燕山板内造山带 早中生代 逆冲推覆构造 崩塌滑覆构造 

分 类 号：P542[天文地球—构造地质学]