南海海盆东-西部地质特征存在巨大差异  

Large geological differences between the East and Southwest Subbasins of the South China Sea

作　　者：李春峰[1] 李志康 李亚清[1] 刘宇涛 彭希 温永林 LI Chunfeng;LI Zhikang;LI Yaqing;LIU Yutao;PENG Xi;WEN Yonglin(Department of Marine Sciences,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]浙江大学海洋科学系,舟山316021

出　　处：《科技导报》2020年第18期40-45,共6页Science & Technology Review

基　　金：国家自然科学基金重大研究计划重点项目(91028007);国家自然科学基金集成项目(91428309);国际合作重点项目(41761134051)。

摘　　要：南海中部存在巨大的中南断裂将南海海盆分割为东-西两部分,至少自1亿年以来,在沉积环境与沉积厚度、洋陆边界的属性与特征、大陆破裂的时代、岩浆活动的来源与程度、减薄大陆架和大陆坡的宽度、洋壳年龄与磁性层结构、磁异常条带特征、岩石化学等诸多方面都存在巨大差异,它们主要受控于早期地质构造背景的差异、东西部大陆减薄伸展速率的变化以及海底扩张的构造环境的不同,并深刻影响了之后的区域沉积分区和沉降特征。The South China Sea is roughly divided by the Zhongnan Fault into the eastern and western parts,with big differences in the Mesozoic sedimentation and the residual thickness,the nature and the characteristics of the continent-oceanic boundary,the age of the continental breakup,the width of the thinned continental lithosphere,the age and the magnetic layer structure of the oceanic crust,the magnetic anomaly,the lithochemistry,and the magmatic activity.They are mainly controlled by the east-west difference in the pre-rift tectonic background,the lithospheric extension rates,and the tectonic settings related with seafloor spreading.These factors profoundly affect the subsequent regional sedimentary zonation and thermal subsidence.

关 键 词：南海 伸展速率 海底扩张 大陆岩石圈破裂 洋陆边界 

分 类 号：P736[天文地球—海洋地质]