THE STRUCTURAL FEATURES OF XISHA TROUGH BASIN
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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1 500~8 000 m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。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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Key words:
- deep water /
- geological structures /
- the Xisha Trough Basin /
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