三沙海底峡谷识别与地貌特征分析

发布时间：2018-03-16 22:42

本文选题：海底峡谷　切入点：重力流　出处：《海洋地质与第四纪地质》2017年03期 　论文类型：期刊论文

【摘要】：三沙海底峡谷是连接西沙碳酸盐台地与南海西北次海盆的深水海底峡谷,起源于永兴岛和东岛之间的浅水区域,输送了大量碳酸盐碎屑到西北次海盆。三沙海底峡谷是迄今为止发现的南海最大碳酸盐型海底峡谷。海底峡谷的横断面呈现V、U字形,可以分为峡谷外侧、斜坡和谷底3个部分。峡谷外侧平缓、两侧斜坡陡峭、谷底平缓。沿着峡谷走向,可以分为上游、中游和下游3部分。上游部分坡度较陡、坡度变化较大,环礁周边的水道和海底滑坡体系是源区的碎屑物质搬运通道;中-下游部分坡度平缓、坡度变化小,主要以碎屑物质的搬运为主,汇入两侧斜坡上的侵蚀、坍塌形成的碎屑,在西北次海盆形成了喇叭状的入海盆口。通过三沙海底峡谷的研究,有助于揭示岛礁与海盆之间的沉积物输送、海底不稳定性等基础科学问题,为碳酸盐岩油气储层预测、岛礁生态旅游开发提供理论基础。
[Abstract]:Sansha submarine canyon is a deep-water submarine canyon connecting the Xisha carbonate platform and the northwest subbasin of the South China Sea. It originated in the shallow water area between Yongxing Island and East Island. A large amount of carbonate debris was transported to the northwest subbasin. The Sansha submarine canyon is the largest carbonate submarine canyon found in the South China Sea so far. The cross-sectional section of the submarine canyon is in the shape of V-U, which can be divided into the outer side of the canyon. There are three parts of the slope and the bottom of the valley. The outside of the canyon is gentle, the slope on both sides is steep, and the bottom of the valley is gentle. Along the canyon direction, it can be divided into three parts: upstream, middle and downstream. The channel around the atoll and the submarine landslide system are the debris material transport channels in the source region. The slope of the middle and lower reaches is gentle and the slope change is small. It mainly consists of the transport of the debris material, and the debris formed by the erosion and collapse of the slopes on both sides. A loudspeaker mouth was formed in the northwest subbasin. The study of the Sansha submarine canyon is helpful to reveal the basic scientific problems such as sediment transport and submarine instability between the reef and the basin, and to predict carbonate oil and gas reservoirs. The development of island and reef ecotourism provides the theoretical basis.
【作者单位】：中国地质调查局广州海洋地质调查局;中国科学院深海科学与工程研究所;中国石油大学(华东);海南省海洋地质调查研究院;
【基金】：国家自然科学基金项目(41576049,41666002) 中国科学院前沿科学研究重点计划项目(QYZDB-SSW-SYS025)
【分类号】：P736;P737.2

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