Depositional Characteristics and Formation Mechanisms of Contour Current in South Dongsha Uplift during the Quaternary
doi: 10.3969/j.issn.1000-0550.2018.014
Funds:
National Science and Technology Major Project, No. 2016ZX05026-003
- Received Date: 2016-10-24
- Rev Recd Date: 2017-03-12
- Publish Date: 2018-02-10
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Key words:
- Pearl River Mouth Basin /
- South Dongsha Uplift /
- Quaternary /
- bottom current /
- contour current
Abstract: The continent slope of the South Dongsha Uplift of the Pearl River Mouth Basin (water depth is between 900 m~2 600 m) with series of contourite developed exist prominent water exchange between South China Sea and Western North Pacific, but the researches on depositional characteristics and formation mechanisms of contourite are still lack of sufficient evidences. Based on the analysis of regional seismic data and drilling data from ODP1144 site, 5 types of bottom current deposition can be established:plastered drift、elongated-mounded drift、separated drift、sediment wave and sheeted drift. Through the characteristics and distribution of contour current, the contourite developed successively from continent slope to abyssal, and sediment wave mainly developed in continent slope. The development and evolution of contourite in South Dongsha Uplift during the Quaternary controlled by various factors, the main factors including:the "two-layers" circulation pattern of intermediate and deep-water masses between South China Sea and Western North Pacific、Coriolis effect、the interaction between bottom current and gravity current which induced by eustacy during glaciation and interglacial periods and the topography of seafloor which was modified by neotectonic movement.
| Citation: | JIANG Ning, HE Min, LIU Jun, PANG Xiong, ZHANG XiangTao, XUE HuaiYan. Depositional Characteristics and Formation Mechanisms of Contour Current in South Dongsha Uplift during the Quaternary[J]. Acta Sedimentologica Sinica, 2018, 36(1): 120-131. doi: 10.3969/j.issn.1000-0550.2018.014
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