内蒙东部及邻区晚石炭世—二叠纪构造古地理环境及演变  

Late Carboniferous-Permian Tectono-Geographical Conditions and Development in Eastern Inner Mengolia and Adjacent Areas

作　　者：田树刚[1] 李子舜[1] 张永生[2] 宫月萱 翟大兴[2] 王猛[2] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质科学院矿产资源研究所,北京100037 [3]中国地质科学院,北京100037

出　　处：《地质学报》2016年第4期688-707,共20页Acta Geologica Sinica

基　　金：国家自然科学基金项目(批准号:41072021;41472027);中国地质调查项目(编号:1212011121067;1212011120927)联合资助

摘　　要：建立构造地层等时格架和不同构造地理单元地层的沉积相变序列,研究化石群落古生态学、生物建造发育和大地构造对环境的制约,将内蒙东部及邻区晚石炭世-二叠纪构造古地理环境及演变分为三个阶段。古亚洲洋阶段(晚石炭世—早二叠世)、兴-蒙海槽阶段(中二叠世)和兴-蒙张裂海槽阶段(晚二叠世)。区内该时期构造古地理环境始终受两条构造线控制,从南到北呈现三分性。索伦山-西拉沐伦断裂以南属华北板块,查干敖包-阿荣旗断裂以北属西伯利亚板块,两大板块之间先期为宽阔海洋,后期变窄成海槽,并夹有多个中间地块,如贺根山地块、索伦山地块、黄岗梁地块和佳木斯地块等。各地块在不同时期相互愈合并增生到板块边缘。林西地区晚二叠世晚期生物礁和海相化石的发现,马达屯期大规模火山喷发,及暴露在内蒙巴林右旗与吉林九台县的P\T角度不整合,均证明兴-蒙海槽在晚二叠世末期最终闭合,并区域褶皱隆起。In order to build the tectono-stratigraphical framework and facies sequences of different geographical units in eastern Inner Mongolia and the adjacent areas,this study discussed the constraints of fossilcommunity ecology,organic-building distribution and tectonic over the environments.Paleo-geographical environment and evolution of eastern Inner Mongolia and its adjacent areas can be divided into three stages：the Paleo-Asian Ocean stage in Late Carboniferous-Early Permian,the Xing-Meng marine-trough stage in Middle Permian,and the Xing-Meng expanded marine-trough stage in Late Permian.The tectonogeographical patterns were controlled by two faults and separated into three parts.The south of the Solun Shan-Xilamulun fault belonged to North China Plate,while the north of the Chagan Aobao-Arongqi fault to the south margin of Siberia Platform.The area between two faults included ocean and then shrank to marine troughs,in which some mediate masses were scattered,such as the Hegenshan Mass,the Solunshan-Huanggangliang united mass and the Jiamusi Mass etc.Each mass accreted to platform margins at different times.Discovery of Late Permian reefs and marine fossils in the Linxi area indicates that large scale volcano eruptions occurred in the Madatun period,and the P/T disconformity exposed at the Balinyou Flag of Inner-Mongolia and the Jiutai County of Jilin also shows that the Xing-Meng trough was finally closed at the Late Permian accompanied with regional folding and uplifting.

关 键 词：内蒙东部 石炭—二叠纪 大地构造格局 古地理演变 环境制约 

分 类 号：P534.4[天文地球—古生物学与地层学]