| 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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| 引用本文： | 陈慧,解习农,毛凯楠.南海北缘一统暗沙附近深水等深流沉积体系特征[J].地球科学,2015,40(4):733-743. |
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| 作者姓名： | 陈慧 解习农 毛凯楠 |
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| 作者单位： | 中国地质大学构造与油气教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金(Nos.41372112,91028009);国家重点油气专项(No.2011ZX05025-002-02);教育部“111”引智计划(No.B14031) |
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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700~1 000 m)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.
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| 关 键 词： | 一统暗沙 深水等深流沉积体系 底流 海洋地质 |
| 收稿时间： | 2014-07-25 |
Deep-Water Contourite Depositional System in Vicinity of Yi'tong Shoal on Northern Margin of the South China Sea |
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| Chen Hui
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Xie Xinong
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Mao Kainan.Deep-Water Contourite Depositional System in Vicinity of Yi'tong Shoal on Northern Margin of the South China Sea[J].Earth Science-Journal of China University of Geosciences,2015,40(4):733-743. |
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| Authors: | Chen Hui Xie Xinong Mao Kainan |
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| Affiliation: | Chen Hui;Xie Xinong;Mao Kainan;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences; |
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| Abstract: | Using high-resolution 2D seismic data, this study reveals the presence of a deep-water contourite depositional system that developed in vicinity of the Yi'tong Shoal (700-1 000 m depth), 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, a plastered 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 (11.6 Ma). |
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| Keywords: | Yi'tong Shoal deep-water contourite depositional system bottom current marine geology |
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