晚始新世以来雅浦海沟-岛弧构造演化模式  

Model of Tectonic Evolution for Yap Trench-Arc Since Late Eocene

作　　者：瞿洪宝 郑彦鹏[1,2,3] 刘晨光[1,2,3] 裴彦良[1,2,3] 华清峰[1,2,3] 李先锋[1,2,3] 马龙[1,2,3] 李天光[1,2,3] QU Hong-bao ZHENG Yan-peng LIU Chen-guang PEI Yan-liang HUA Qing-feng LI Xian-feng MA Long LI Tian-guang(Key Laboratory of Marine Sedimentology and Environmental Geology ,Qingdao 266061 ,China The First Institute of Oceanography ,SOA , Qingdao 266061 ,China Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061 ,China Marine geological survey institute of Hainan Province, Haikou 570206 ,China)

机构地区：[1]海洋沉积与环境地质国家海洋局重点实验室,山东青岛266061 [2]国家海洋局第一海洋研究所,山东青岛266061 [3]青岛海洋科学与技术国家实验室,海洋地质过程与环境功能实验室,山东青岛266061 [4]海南省海洋地质调查研究院,海南海口570206

出　　处：《海洋科学进展》2017年第2期249-257,共9页Advances in Marine Science

基　　金：国家自然科学基金项目--西菲律宾海盆扩张脊的构造特征及其地质意义(41176058);南北极环境综合考察与评估专项--南极周边海域海洋地球物理考察(CHINARE2014-01-03);南极周边海域与大陆资源潜力综合评估(CHINARE2015-04-02)

摘　　要：雅浦海沟-岛弧构造体系是菲律宾海板块与太平洋板块、卡罗琳板块相互作用而形成的构造俯冲带,其南北两段俯冲带在海底地形地貌、地球物理场、应力场特征等方面表现出显著的差异。北段俯冲方向为近东西向,总体表现为俯冲角度较小、俯冲深度浅、俯冲速度较快、应力场呈俯冲拉张型等特征;南段由东西方向的俯冲过渡至北北西向,总体表现为俯冲角度大、俯冲深度较深、俯冲速度极慢、应力场呈俯冲挤压型等特征。这些差异的形成经历了2个主要的构造演化阶段:菲律宾海板块与太平洋板块在晚始新世至晚渐新世期间相互作用并形成了古马里亚纳-雅浦海沟;晚渐新世以来菲律宾海板块与卡罗琳板块的相互作用对古海沟构造改造,进而造就了雅浦海沟-岛弧当今复杂的构造形态。The Yap Trench-arc tectonic system is a subduction zone where the Philippines Sea Plate （PSP） interacts with the Pacific Plate （PP） and the Caroline Plate （CP）.Based on differences in the seafloor topography,geophysical field,stress field and other geological aspects,the system can be subdivided into the north and south parts.The seafloor lithosphere subducts along the Yap Trench nearly from east to west in the northern part,whereas the direction turns to NNW in the southern part.The subduction rate in the northern part is relatively fast,and the subduction process is characterized by a low angle and shallow depth with a tension state of stress.Compared to the northern part,the subduction angle is larger in the southern part,and the subduction depth is also deeper with a compression state of stress.These diverse characteristics are caused by the two tectonic evolution stages.During the late Eocene to late Oligocene,the interaction between the PSP and the PP resulted in the formation of the proto-Mariana-Yap Trench.Since the late Oligocene,the trench was subsequently reconstructed by the interaction between the PSP and CP.Thus,the complicated structural pattern of the Yap Trench-arc system is resulted from the complex interaction among these three tectonic plates （PSP,PP and CP）.

关 键 词：雅浦海沟 菲律宾海板块 卡罗琳板块 板块俯冲 构造演化 

分 类 号：P738[天文地球—海洋地质]