南海北缘一统暗沙附近深水等深流沉积体系特征
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摘要
利用高分辨率2D地震资料揭示南海北缘一统暗沙附近(水深700~1 000m)发育海山相关的深水等深流沉积体系,为南海北部陆缘深水洋流循环和深海动力学研究,以及深水油气矿产资源勘探提供了新的资料.一统暗沙南、北两侧发育边缘侵蚀槽沟,其中北缘的边缘槽沟可称为"环槽",反映底流(可能属于南海中层水循环体系)自西向东流经海山.一套等深流沉积的伸长状-丘状漂积体沿环槽北岸发育.一统暗沙南侧和背侧还发育黏附型漂积体、南侧沉积区和补丁型漂积体.地震沉积记录显示该区稳定底流侵蚀-沉积活动可追溯至晚中新世早期.
Using high-resolution 2Dseismic data,this study reveals the presence of a deep-water contourite depositional system that developed in vicinity of the Yi'tong Shoal(700-1 000mdepth),on the northern margin of the South China Sea.The development of a moat north of the Yi'tong Shoal indicates eastward flowing bottom currents,which might belong to the South China Sea Intermediate Water Circulation.Due to the coriolis deflection,an elongated-mounded drift is developed to the north of the moat.A marginal trough,aplastered drift and a deposition zone developed south of the Yi'tong Shoal,indicative of relatively weak hydrodynamics in the south side.A shadow zone downstream of the Yi'tong Shoal was generated where the currents slowed down,developing a depositional tail.Seismic stratigraphy shows that the initial development of the deep-water contourite depositional system was developed from the early Late Miocene(11.6Ma).
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