Structural architecture of Neoproterozoic rifting depression groups in the Tarim Basin and their formation dynamics

查看全文 作　　者：Bizhu [1]HE;Cunli [2]JIAO;Taizhu [3]HUANG;Xingui [4]ZHOU;Zhihui [1]CAI;Zicheng [3]CAO;Zhongzheng [3]JIANG;Junwen [1]CUI;Zhuoyin [1]YU;Weiwei [1]CHEN;Ruohan [1]LIU;Xiaorui [1]YUN;Guangming [1]HAO

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences;[2]Exploration and Production Research Institute of SINOPEC;[3]Institute of Northwestern Petroleum Subsidiary of SINOPEC;[4]Oil and Gas Investigation Centre of China Geological Survey

出　　处：《Science China Earth Sciences》索引2019年第62卷第3期,共21页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41872121 & 41630207);the Basic Scientific Research Projects of the Chinese Academy of Geological Sciences (Grant Nos. JYYWF20180903 & JYYWF20182103);the Science Research project from the Northwest Subsidiary of SINOPEC (Grant No. KY2013-S-024);the work project of Chinese Geological Survey (Grant Nos. 12120115002101, DD20160022, DD20160169 & 12120115026901) 摘　　要：The Tarim Basin is the largest, oil-bearing, superimposed basin in the northwest of China. The evolution and tectonic properties of the initial Tarim Basin have been hotly disputed and remain enigmatic. The Neoproterozoic basin is covered by a vast desert and a huge-thickness of sedimentary strata, has experienced multiple tectonic movements, had a low signal to noise ratios(SNRs) of deep seismic reflection data, all of which have posed critical obstacles to research. We analysed four field outcrops, 18 wells distributed throughout the basin, 27 reprocessed seismic reflection profiles with higher SNRs across the basin and many ancillary local 2D and 3D profiles and aeromagnetic data. We found about 20 normal fault-controlled rifting depressions of the Cryogenian and Ediacaran scattered throughout the basin, which developed on the Precambrian metamorphic and crystalline basement. The structural framework is clearly different from that of the overlying Phanerozoic. The rifting depressions consist of mainly half grabens, symmetrical troughs and horst-grabens. From the northeast to southwest of the basin,they are divided into three rifting depression groups with the WNW, ENE, and NW-trends that are mainly controlled by normal faults. The maximum thicknesses of the strata are up to 4100 m. From the Cryogenian to Ediacaran, most of the main inherited faults to active and eventually ceased at the end of the Ediacaran or Early Cambrian, while subsidence centres appeared and migrated eastward along the faults. They revealed that the different parts of the Tarim continental block were in NNE-SSWoriented and NNW-SSE-oriented extensional paleo-stress fields(relative to the present) during the Neoproterozoic, and were accompanied by clockwise shearing. According to the analysis of the activities of syn-sedimentary faults, filling sediments,magmatic events, and coordination with aeromagnetic anomalies, the tectonic properties of the fault depressions are different and are primarily continental rifts or intra-continental fault-controlled basins. The rifting phases mainly occurred from 0.8–0.61 Ga.The formation of the rifting depression was associated with the initial opening of the South Altun-West Kunlun Ocean and the South Tianshan Ocean, which were located at the northern and southern margins of the Tarim Block, respectively, in response to the break-up of the Supercontinent Rodinia and the initial opening of the Proto-Tethys Ocean. 关键词：RIFTING DEPRESSION groups Normal faults Extensional and clockwise shearing CRYOGENIAN and EDIACARAN Continental rift and intra-continental fault-controlled BASIN Tarim BASIN

相关文献

参考文献（124）
引证文献（5）
耦合文献（1193）

参考文献(124)

引证文献(5)

耦合文献(1193)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Structural architecture of Neoproterozoic rifting depression groups in the Tarim Basin and their formation dynamics

参考文献(124)

引证文献(5)

耦合文献(1193)

用户提示