| 南海西沙海槽盆地地质构造特征 |
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| 引用本文： | 钟广见,冯常茂,韦振权.南海西沙海槽盆地地质构造特征[J].海洋地质与第四纪地质,2012(3):63-68. |
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| 作者姓名： | 钟广见 冯常茂 韦振权 |
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| 作者单位： | 中国地质大学;广州海洋地质调查局 |
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| 摘 要： | 西沙海槽盆地是一个发育在南海北部陆坡深水区的新生代沉积盆地,接受了厚1 500～8 000m的沉积,沉积层中部厚,南北薄,呈南北分带特征。地震剖面上表现出下断上拗的特点,盆地裂陷期的构造样式以"多米诺式半地堑"或"地堑"为特征,控制半地堑发育的主要断层有F1、F2、F3、F4、F5。盆地发育经历了古新世—渐新世断陷和中新世—第四纪拗陷两个主要演化阶段,断陷阶段发育陆相河湖相沉积,拗陷阶段发育浅海-半深海沉积。
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| 关 键 词： | 深水区 地质构造 西沙海槽盆地 南海 |
THE STRUCTURAL FEATURES OF XISHA TROUGH BASIN |
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| ZHONG Guangjian,FENG Changmao,WEI Zhenquan.THE STRUCTURAL FEATURES OF XISHA TROUGH BASIN[J].Marine Geology & Quaternary Geology,2012(3):63-68. |
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| Authors: | ZHONG Guangjian FENG Changmao WEI Zhenquan |
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| Institution: | 1 China University of Geosciences,Beijing 100083;2 Guangzhou Marine Geological Survey,Guangzhou 510760) |
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| Abstract: | The Xisha Trough Basin,located on the continental slope of the northern South China Sea,is a Cenozoic deepwater basin.The sediment fill in the basin is about 1500 ~ 8000m in thickness,and becomes thinner from the center towards north and south.The sediments show a zonal distribution pattern in north-south direction.In seismic profiles,there is double-layer structure,of which the upper is formed with subsidence and the lower with rifting.The structures formed in the rifting stage were mainly of "Domino-style of half-graben",a series of half-graben controlled by major faults on one side(F1,F2,F3,F4,F5).The basin has experienced two stages of evolution: the first stage underwent rifting through Paleocene-Oligocene and filled with lacustrine deposits,the second stage underwent subsidence through Miocene-Quaternary and filled shallow or bathyal sediments. |
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| Keywords: | deep water geological structures the Xisha Trough Basin |
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