Mesozoic Deformation and Its Geological Significance in the Southern Margin of the South China Sea
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  • 英文篇名:Mesozoic Deformation and Its Geological Significance in the Southern Margin of the South China Sea
  • 作者:ZHU ; Rongwei ; LIU ; Hailing ; YAO ; Yongjian ; WANG ; Yin
  • 英文作者:ZHU Rongwei;LIU Hailing;YAO Yongjian;WANG Yin;CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology,Chinese Academy of Sciences;Guangzhou Marine Geological Survey;University of Chinese Academy of Sciences;
  • 英文关键词:southern continental margin of the South China Sea;;Mesozoic deformation structure;;structural restoration;;proto-South China Sea
  • 中文刊名:QDHB
  • 英文刊名:中国海洋大学学报(英文版)
  • 机构:CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology,Chinese Academy of Sciences;Guangzhou Marine Geological Survey;University of Chinese Academy of Sciences;
  • 出版日期:2018-08-15
  • 出版单位:Journal of Ocean University of China
  • 年:2018
  • 期:v.17
  • 基金:supported by the National Natural Science Foundation of China (Nos. 41476039, 91328205, 415760 68 and 41606080)
  • 语种:英文;
  • 页:QDHB201804013
  • 页数:11
  • CN:04
  • ISSN:37-1415/P
  • 分类号:128-138
摘要
The pre-Eocene history of the region around the present South China Sea is not well known. New multi-channel seismic profiles provide valuable insights into the probable Mesozoic history of this region. Detailed structural and stratigraphic interpretations of the multi-channel seismic profiles, calibrated with relevant drilling and dredging data, show major Mesozoic structural features. A structural restoration was done to remove the Cenozoic tectonic influence and calculate the Mesozoic tectonic compression ratios. The results indicate that two groups of compressive stress with diametrically opposite orientations, S(S)E– N(N)W and N(N)W–S(S)E, were active during the Mesozoic. The compression ratio values gradually decrease from north to south and from west to east in each stress orientation. The phenomena may be related to the opening of the proto-South China Sea(then located in south of the Nansha block) and the rate at which the Nansha block drifted northward in the late Jurassic to late Cretaceous. The Nansha block drifted northward until it collided and sutured with the southern China margin. The opening of the present South China Sea may be related to this suture zone, which was a tectonic zone of weakness.
        The pre-Eocene history of the region around the present South China Sea is not well known. New multi-channel seismic profiles provide valuable insights into the probable Mesozoic history of this region. Detailed structural and stratigraphic interpretations of the multi-channel seismic profiles, calibrated with relevant drilling and dredging data, show major Mesozoic structural features. A structural restoration was done to remove the Cenozoic tectonic influence and calculate the Mesozoic tectonic compression ratios. The results indicate that two groups of compressive stress with diametrically opposite orientations, S(S)E– N(N)W and N(N)W–S(S)E, were active during the Mesozoic. The compression ratio values gradually decrease from north to south and from west to east in each stress orientation. The phenomena may be related to the opening of the proto-South China Sea(then located in south of the Nansha block) and the rate at which the Nansha block drifted northward in the late Jurassic to late Cretaceous. The Nansha block drifted northward until it collided and sutured with the southern China margin. The opening of the present South China Sea may be related to this suture zone, which was a tectonic zone of weakness.
引文
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