南海北部白云凹陷陆坡海底峡谷地形地貌与沉积地层特征

朱林; 傅命佐; 刘乐军; 李家钢; 高珊

doi:10.3724/SP.J.1140.2014.02001

南海北部白云凹陷陆坡海底峡谷地形地貌与沉积地层特征

1. 国家海洋局第一海洋研究所, 青岛 266061;
2. 中海石油研究总院, 北京 100027

基金项目:

国家自然科学基金项目(40606015)

“十二五”国家科技重大专项子课题(2011ZX05056-001-02)

详细信息

作者简介:
朱林(1987-),女,研究生,E-mail:dbsdzl@126.com

中图分类号: P736.1
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- 文章访问数: 2087
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出版历程
- 收稿日期: 2013-03-16
- 修回日期: 2013-06-18

CANYON MORPHOLOGY AND SEDIMENTS ON NORTHERN SLOPE OF THE BAIYUN SAG

1. First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
2. Petroleum Research Institute, Beijing 100027, China

摘要

摘要: 利用2011年在南海白云凹陷北部陆坡海域获得的多波束测深数据和浅层多道地震剖面,对研究区海底峡谷的地形地貌要素和沉积地层进行了详细的分析。在水深500~1 700 m范围内识别出14条NNW-SSE向或近N-S向展布的近直线型海底峡谷,长度为12~39.2 km,宽度为1.1~3.4 km,下切深度最大达234 m,谷壁西缓东陡,谷底最深处均靠近东侧谷壁。峡谷上段谷底无沉积物堆积或有少量蚀余堆积,地层反射面略向东倾斜,谷壁上有滑塌现象。下段谷底位于浊流堆积扇上,沉积厚度较大,地层呈平行或亚平行的反射模式,侧向连续性好,有些地方发育密集的断层和滑塌构造。谷脊布满了丘状凸起,地层结构揭示出其沿坡爬升的趋势,有的凸起下方有沿断层向谷底方向的错动。
- 海底峡谷 /
- 白云凹陷 /
- 南海
Abstract: Detail interpretation of morphology and stratigraphic structure was made in this paper for the bottom deposits in the Baiyun Sag, based on the multi-beam bathymetric data and multi-channel seismic profiles. We recognized 14 submarine canyons of 12~39.2 km long and 1.1~3.4 km wide distributed in NNW-SSE or nearly N-S directions in the water depth of 500~1 700 m. The maximum incision is up to 234m in depth. The eastern wall of the canyons is usually steeper than the western and the deepest part of the canyon is close to the eastern wall. There is none or only a small amount of sediments occurred in the upper segments of the canyons and the surface of sediments, if any, tilted slightly eastward. However, the lower segments of canyons usually occur upon turbidite fans with parallel or sub-parallel reflection. Faults and slumping structures are densely developed in some places. Convex structures are commonly observed on canyon ridges and the internal structure of the deposits indicates a climbing up trend along slope.
- slope /
- submarine canyon /
- the Baiyun Sag

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