文献类型：期刊文献

英文题名：Crustal structure from onshore-offshore wide-angle seismic data: Application to Northern Sulu Orogen and its adjacent area

作者：Zhao, Weina[1,2];Wang, Huigang[3];Shi, Hongcai[4];Xie, Hui[4];Wu, Zhiqiang[5];Chen, Shanshan[5];Zhang, Xunhua[6];Hao, Tianyao[7];Zheng, Yanpeng[8]

机构：[1]Northwestern Polytech Univ, Qingdao Res Inst, Qingdao 266200, Shandong, Peoples R China;[2]Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China;[3]Northwestern Polytech Univ, Sch Marine Sci & Technol, Xian 710072, Shaanxi, Peoples R China;[4]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China;[5]Qingdao Inst Marine Geol, Qingdao 266071, Shandong, Peoples R China;[6]China Geol Survey, Nanjing Ctr, Nanjing 210016, Jiangsu, Peoples R China;[7]Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China;[8]Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Shandong, Peoples R China

年份：2019

卷号：770

外文期刊名：TECTONOPHYSICS

收录：SCI-EXPANDED(收录号：WOS:000498329500003)、、EI(收录号：20194307579279)、Scopus(收录号：2-s2.0-85073758049)、WOS

基金：We thank the Qingdao Institute of Marine Geology for providing the seismic data. This work was supported by the National Natural Science Foundation of China [grant numbers 41806048, 412100051; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences [No. MGE2018KG11]; the National High Technique R&D Program (863) [grant number 2009AA093401]; the Aoshan Science and Technology Innovation Project of Qingdao National Laboratory of Marine Science and Technology [grant number 2015ASKJ03-Seabed Resources]; the Fundamental Research Funds for the Central Universities [grant number 31020190QD032].

语种：英文

外文关键词：Northern Sulu Orogen; Wide-angle seismic survey; 2-D crustal structure; Subduction polarity; Orogenic boundary

外文摘要：The Northern Sulu Orogen is the northeastern part of the Dabie-Sulu Orogen, which formed during the Triassic collision between the North China Block (NCB) and the South China Block (SCB). The lack of detail in the onshore-offshore seismic model in the crustal levels means that the deep boundaries and subduction polarity of the Northern Sulu Orogen remain ambiguous. To obtain insight into the contact relationship between the NCB and SCB and their tectonic implication, we processed the onshore-offshore wide-angle seismic data from 32 sections that were acquired in 2013 in order to achieve a continuous 2-D velocity and interface model. The results show that three parts exhibit significant differences in the P-wave velocities, interface depths and intracrustal structures, which all correlate well with the regional geology and tectonics. In the northern and southern parts of the survey area, the upper crust displays low-velocity layers that represent the NCB and the SCB, respectively. The Northern Sulu Orogen is characterized by the relatively faster p-waves, which result from the influence of collision and exhumation. The undulating interfaces together reveal that the southern and northern boundaries of the Northern Sulu Orogen are deep faults that deeply cut through the Moho and have northwest dips in the middle and lower crust. The different crustal nature of three regions suggests that the NCB and SCB crusts have different responses to the continental collision. Our observations, combined with data from previous studies, support that the Northern Sulu Orogen developed during the Indosinian Orogeny, with a northward subduction polarity of the SCB beneath the NCB.