CANYON MORPHOLOGY AND SEDIMENTS ON NORTHERN SLOPE OF THE BAIYUN SAG
-
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。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.
-
Keywords:
- slope /
- submarine canyon /
- the Baiyun Sag
-
-
[1] 韩喜彬,李家彪,龙江平,等.我国海底峡谷研究进展[J]. 海洋地质动态,2010,26(2):41-48. [HAN Xibin, LI Jiabiao, LONG Jiangping, et al. Development of research on submarine canyon in China[J].Marine Geology Letters, 2010,26(2):41-48.]
[2] 苏明,李俊良,姜涛,等.琼东南盆地中央峡谷的形态及成因[J]. 海洋地质与第四纪地质,2009,29(4):86-93. [SU ming, LI junliang, JIANG tao, et al. Morphological features and formation mechanism of central canyon in the Qiongdongnan basin, northern South China Sea[J]. Marine Geology and Quaternary Geology,2009,29(4):86-93.]
[3] 赵月霞,刘保华,李西双,等.东海陆坡不同类型海底峡谷的分布构造响应[J]. 海洋科学进展,2009,27(4):460-468. [ZHAO Yuexia, LIU Baohua, LI Xishuang, et al. Distributions of different submarine canyons on the East China Sea slope and their tectonic response[J].Advances in Marine Science, 2009,27(4):460-68.]
[4] Pickering K, Coleman J, Cremer M, et al. A high sinuosity, laterally migrating submarine fan channel-levee overbank::Result from DSDP Leg96 on the Mississippi Fan, Gulf of Mexico[J]. Marine and Petroleum Geology, 1986, 3(1):3-18.
[5] 龚再升,李思田,谢泰俊,等. 南海北部大陆边缘盆地油气成藏动力学研究[M].北京:科学出版社,2004:30-36.[GONG Zaisheng, LI Sitian, XIE Taijun, et al. Dynamic Research of Oil and Gas Accumulation in Northern Marginal Basins of South China Sea[M]. Beijing:Science Press, 2004:30 -36.]
[6] Peter T, Harris, Tanya White. Globe distribution of large submarine canyons:Geomorphic differences between active and passive continental margins[J]. Marine Geology, 2011, 285:69-86.
[7] 赵月霞,刘保华,李西双,等.东海陆坡海底峡谷-扇体系沉积特征及物质搬运[J]. 古地理学报,2011,13(1):119-126. [ZHAO yuexia, LIU baohua, LI xishuang, et al. Sedimentary characters and material teansportation of submarine canyon-fan systems in slope of the East China Sea[J]. Journal of Palaeogeography, 2011,13(1):119-126.]
[8] 刘保华,郑彦鹏,吴金龙,等. 台湾岛以东海域海底地形特征及其构造控制[J]. 海洋学报,2005,27(5):82-91. [LIU Baohua, ZHENG Yanpeng, WU Jinlong, et al. The topographical characteristics in the area off eastern Taiwan island and their tectonic implication[J]. Acta Oceanologica Sinica, 2005,27(5):82-91.]
[9] 陈冠宇. 台湾西南外海之构造与地形特征及澎湖海底峡谷演化[D]. 中坜市:国立中央大学,2006.[CHEN Guanyu. Structure and landform characteristics of Taiwan's southwest coast and evolution of Penghu submarine canyon[D]. Jhongli City:National Central University, 2006.] [10] 崔洁,何家雄,周永章,等. 珠江口盆地白云凹陷天然气成因及油气资源潜力分布[J]. 天然气地球科学,2009,20(1):125-130. [CUI Jie, HE Jiaxiong, ZHOU Yongzhang, et al. Origin of nature gas and resource potential of oil and gas in Baiyun Sag, Pearl River Mouth Basin[J].Natural Gas Geoscience, 2009,20(1):125-130.]
[11] 孙龙涛,周蒂,陈长民,等. 珠江口盆地白云凹陷断裂构造特征及其活动期次[J]. 热带海洋学报,2008,27(2):25-31. [SUN Longtao, ZHOU Di, CHEN Changmin, et al. Fault structure and evolution of Baiyun Sag in Zhujiang River Mouth Basin[J]. Journal of Tropical Oceanography, 2008,27(2):25-31.]
[12] 姚伯初,万玲,刘振湖,等.南海海域新生代沉积盆地构造演化的动力学特征及其油气资源[J]. 地球科学,2004,29(5):543-549. [YAO Bochu, WAN Ling, LIU Zhenhu, et al. Tectonic dynamics of Cenozoic sedimentary basins and hydrocarbon resources in the South China Sea[J]. Earth Science, 2004,29(5):543-549.]
[13] 朱伟林,张功成,高乐. 南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,29(1):1-9. [ZHU Weilin, ZHANG Gongcheng, Gao Le. Geological characteristics and exploration objectives of hydrocarbons in the northern continental margin basin of South China Sea[J]. Acta Petrolei Sinica, 2008,29(1):1-9.]
[14] 朱伟林,张功成,杨少坤,等.南海北部大陆边缘盆地天然气地质[M]. 北京:石油工业出版社,2007:3-70.[ZHU Weilin, ZHANG Gongcheng, YANG Shaokun, et al. The Gas Geology of Northern Margin of South China Sea[M]. Beijing:Oil Press, 2007:3 -70.]
[15] 柳保军,申俊,庞雄,等. 珠江口盆地白云凹陷珠海组浅海三角洲沉积特征[J]. 石油学报,2007,28(2):49-56. [LIU Baojun, SHEN Jun, PANG Xiong, et al. Characteristics of continental delta deposits in Zhuhai Formation of Baiyun Depression in Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2007,28(2):49-56.]
[16] 孙杰,詹文欢,丘学林.珠江口盆地白云凹陷构造演化与油气系统的关系[J]. 海洋地质与第四纪地质,2011,31(1):101-107. [SUN Jie, ZHAN Wenhuan, Qiu Xuelin. Relationship between tectonic evolution and petroleum systems in Baiyun Sag, Pearl River Mouth Basin[J]. Marine Geology and Quaternary Geology,2011,31(1):101-107.]
[17] 李平鲁.珠江口盆地构造结构及演化[J].中国海上油气(地质),1989,3(1):11-18.[LI Pinglu. Tectonic structures and evolution of the Zhujiangkou Basin[J]. China Offshore Oil and Gas(Geology), 1989,3(1):11-18.] [18] 陈长民,施和生,许仕策,等.珠江口盆地(东部)第三系油气藏形成条件[M].北京:科学出版社,2003.[CHEN Changmin, SHI hesheng, XU Shice, et al. The conditions of hydrocarbon accumulation of the tertiary petroleum system in the Pearl River Mouth Basin[M]. Beijing:Science Press, 2003.] [19] Xie X N, Muller R D, Ren J Y, et al. Stratigraphic architecture and evolution of the continental slope system in offshore Hainan, northern South China Sea[J]. Marine Geology, 2008, 247:129-144.
计量
- 文章访问数: 2087
- HTML全文浏览量: 345
- PDF下载量: 23
下载:
