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济阳坳陷构造演化及其大地构造意义
引用本文:宗国洪,施央申.济阳坳陷构造演化及其大地构造意义[J].高校地质学报,1999,5(3):275-282.
作者姓名:宗国洪  施央申
作者单位:[1]胜利石油管理局 [2]南京大学地球科学系
摘    要:济阳坳陷由负反转盆地、右旋扭张盆地及主动裂谷三个原型叠加而成,并在中、新生代经历了四个演化阶段,三叠纪为板内造山作用阶段,济阳坳陷曾为五条NW向的以逆冲断层为主的压性构造带占据,早-中侏罗世造山作用结束;晚侏罗世-早始新世为负反转盆地阶段,三叠纪NW向逆冲断层发生反向伸展;中始新世-渐新世为右旋扭张盆地阶段,NE,ENE向扭张断裂发育,并进而成盆接受沉积,NW和断裂反向伸展活动受到抑制而渐趋消亡;中新世-全新世为主动裂谷阶段,“拗陷运动”取代“断陷运动”。济阳坳陷构造演化的阶段特征表明了郯庐断裂中、新生代的剪切运动史,即三叠纪右旋剪切,晚侏罗世-早始新世左旋剪切.中始新世-渐新世右旋剪切,中新世-全新世作弱右旋压剪。

关 键 词:济阳坳陷  负反转断裂  郯庐断裂  大地构造意义
收稿时间:1999-09-20
修稿时间:1999-09-20

EVOLUTION OF JIYANG DEPRESSION AND ITS TECTONIC IMPLICATIONS
Zong Guohong,Xiao Huanqin,Li Changbao,Shi Yangshen,Wang Liangshu.EVOLUTION OF JIYANG DEPRESSION AND ITS TECTONIC IMPLICATIONS[J].Geological Journal of China Universities,1999,5(3):275-282.
Authors:Zong Guohong  Xiao Huanqin  Li Changbao  Shi Yangshen  Wang Liangshu
Institution:1.Institute of Geosciences, Shenli Petroleum Administration, Shandong, Dongying 257015; 2. Department of Earth Sciences, Nanjing University, Nanjing, 210093
Abstract:The Meso-Cenozoic Jiyang depression is an assemblage of the negative inversion basin, dextral transtensional basin and active rift with four evolutionary phases. 1. The intraplate thrust orogenic phase (from the Triassic to Middle Jurassic): represented by the development of five NW-striking compressive belts, which were mainly reverse faults. 2. The negative inversion phase (from the Late Jurassic to Early Eocene, i.e., 149~45Ma): the negative inversion of the previous reverse faults, leading to the development of SN-striking high- dip normal faulting. Therefore, the sediments mainly deposited in the NW –trending half-grabens. 3. The dextral transtensional phase (from the Late Eocene to Oligocens, i.e., (45~24.6Ma): development of the NE-striking dextral transtensional faults, the WNW-trending sinistral transtensional fault, the secondary ENE-striking dextral transtensional fault and the EW- striking normal fault. These faults controlled the sedimentation in the basin and the previous faults became inactive. Consequently, the dextral transtensional basin overlapped the negative in version basin. 4. The active rifting phase (from the Miocene to Holecene, i.e., (24. 6Ma~present): the previous differential block faulting was replaced by the regional depression. The evolution of major faults in the Jiyang depression could be used to interpret the shearkinematics history of the Tan. Lu fault zone in the Meso-Cenozoic. The results of this study demonstrated that the Jiyang depression underwent dextral shear during the Triassic, sinistral shear from the Late Jurassic to the Early Eocene, dextral shear from the Middle Eocene to the Oligocene, an d weak dextral transpression from the Miocene to the Holocene.
Keywords:Jiyang depression  negative inversion basin  dextral transtensional basin  Tan  Lu fault
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