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南海东部古扩张脊的俯冲机制
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  • 英文篇名:SUBDUCTION OF THE PALEO-SPREADING-RIDGE IN EASTERN SOUTH CHINA SEA
  • 作者:詹文欢 ; 李健 ; 唐琴琴
  • 英文作者:ZHAN Wenhuan;LI Jian;TANG Qinqin;CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology;University of Chinese Academy of Sciences;
  • 关键词:古扩张脊 ; 俯冲带 ; 马尼拉海沟 ; 南海
  • 英文关键词:ancient spreading ridge;;subduction zone;;Manila Trench;;South China Sea
  • 中文刊名:HYDZ
  • 英文刊名:Marine Geology & Quaternary Geology
  • 机构:中国科学院边缘海与大洋地质重点实验室中国科学院南海海洋研究所;中国科学院大学;
  • 出版日期:2017-12-28
  • 出版单位:海洋地质与第四纪地质
  • 年:2017
  • 期:v.37;No.170
  • 基金:中国科学院战略性先导科技专项(A类)(XDA13010000);; 国家自然科学基金项目(41376063);; 国家科技基础资源调查项目《南海及其附属岛礁地质环境历史资料整编》(2017FY201406)
  • 语种:中文;
  • 页:HYDZ201706002
  • 页数:11
  • CN:06
  • ISSN:37-1117/P
  • 分类号:5-15
摘要
南海东部古扩张脊处于欧亚板块和太平洋板块的汇聚地带,其东侧为马尼拉海沟、北吕宋海槽和西吕宋海槽,由于受到多个构造单元的相互作用,使其处于复杂的构造环境中。南海东部古扩张脊俯冲过程的研究对深入理解南海海盆构造演化、火山及地震活动等具有重要意义,同时也是今后南海构造研究的重要方向之一。在总结前人研究基础之上,探讨南海东部古扩张脊俯冲时间、俯冲深度及动力学过程。南海板块在16 Ma之后,由于菲律宾板块NW向仰冲的作用,使南海东部古扩张脊被动地沿马尼拉海沟进行俯冲,形成了现今马尼拉海沟中段的构造格局。古扩张脊俯冲深度为200~300km,并且在约100km处发生板片撕裂,造成古扩张脊两侧俯冲角度的不同。
        The paleo-spreading-ridge of the eastern South China Sea,striking in NE50°,lying between the Eurasian plate and the Pacific plate(Philippine Sea plate),is about 240 kilometers long from east to west and bordered with the Manila Trench,the North Luzon Trough and the West Luzon Trough to the east.Based on previous studies,this paper is devoted to the discussion of the subduction time,subduction depth and dynamic process of the paleo-spreading ridge.After 16 Ma,the paleo-spreading-ridge of the South China Sea was passively subducting along the Manila trench,forming the structural pattern of the middle segment of the Manila Trench.The depth of subduction was between 200-300 km,with slab tears happened at about 100 km,which resulted in the difference in subduction angle on both sides of the paleo-ocean-ridge.The subduction of the paleo-ocean-ridge is quite significant to the research of South China Sea'stectonic evolution in the future.
引文
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