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    李学杰, 孙美静, 陈家乐, 高红芳, 彭学超, 张勇, 阮小燕. 南海第四系厚度分布特征及其主控因素[J]. 中国地质. DOI: 10.12029/gc20220930001
    引用本文: 李学杰, 孙美静, 陈家乐, 高红芳, 彭学超, 张勇, 阮小燕. 南海第四系厚度分布特征及其主控因素[J]. 中国地质. DOI: 10.12029/gc20220930001
    LI Xuejie, SUN Meijing, CHEN Jiale, GAO Hongfang, PENG Xuechao, ZHANG Yong, RUAN Xiaoyan. Distribution of Quaternary sedimentary thickness in South China Sea and its main controlling factors[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220930001
    Citation: LI Xuejie, SUN Meijing, CHEN Jiale, GAO Hongfang, PENG Xuechao, ZHANG Yong, RUAN Xiaoyan. Distribution of Quaternary sedimentary thickness in South China Sea and its main controlling factors[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220930001

    南海第四系厚度分布特征及其主控因素

    Distribution of Quaternary sedimentary thickness in South China Sea and its main controlling factors

    • 摘要:研究目的】第四系厚度不仅可以反映物源与沉积特征,也反映构造活动对沉积过程的控制作用。【研究方法】本文以大量单道和多道地震数据为基础,经钻孔验证,首次完整编制了南海第四系厚度分布图。【研究结果】结果表明,南海第四系沉积厚度变化很大,最厚超过2000m,最薄处近乎剥蚀殆尽。【结论】南海西缘的莺歌海盆地、中建南盆地、万安盆地等海域形成沉积沉降中心,表明第四纪时西缘断裂带仍在活动,并控制沉积过程,形成沉降中心;南海西北陆坡发育北东向的沉积沉降中心,表明南海西北部第四纪仍以拉张为主;南海北部的东沙海域第四系基本被剥蚀掉,表明该区第四纪以来持续隆升,并受到强海流的冲刷作用。因此南海北部第四纪表现出西部沉降、东部隆升的格局。南海东缘马尼拉海沟的第四系较厚,主要是由于构造挤压作用,使得沉积层堆叠增厚,同时有来自台湾岛和菲律宾陆地充足的沉积物源供应。

       

      Abstract: This paper is the result of 1:1,000,000 marine geological survey engineering. Objective Quaternary sedimentary thickness can not only reflect the provenance and sedimentary characteristics, but also reflect the tectonic activity characteristics to a certain extent. Methods Based on a large number of single channel and multi-channel seismic data and verified by drilling holes, the Quaternary thickness map of the SCS was compiled. Results The thickness of quaternary sediments in the South China Sea (SCS) varies a lot, with the maximum thickness over 2000m and the minimum one close to 0. ConclusionsSedimentary and subsidence centers were formed in the western margin of SCS, including Yinggehai, Zhongjiannan and Wan'an sea area, which indicates that the fault zone in the western margin is still active in Quaternary period and controls the development of these subsidence centers. The development of NE trending sedimentary centers on the northwest continental slope of the South China Sea may indicate that the northwestern SCS is still dominated by extension in quaternary. The thickness of quaternary in Dongsha sea area is near 0, indicating that the area has been continuously uplifted and washed by strong current since quaternary. Therefore, the northern South China Sea shows a pattern of subsidence in the west and uplift in the east. The relatively thicker Quaternary in the Manila Trench in the eastern margin of the SCS is mainly a result of tectonic compression resulting in sedimentary layers thicker and abundant provenance from Taiwan and the Philippines.

       

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