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首页> 外文期刊>Journal of Asian earth sciences >New interpretation for the main sediment source of the rapidly deposited sediment drifts on the northern slope of the South China Sea
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New interpretation for the main sediment source of the rapidly deposited sediment drifts on the northern slope of the South China Sea

机译：对南海北坡急速沉积物漂移主要沉积源的新解释

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摘要

The slope of the northern South China Sea (SCS) is one of the world's most active areas of modem marine sedimentary processes. A rapidly deposited sediment drift (RDSD) was identified on the slope near Dongsha Island. The sources of this body have been studied and discussed by several authors, but no consensus has been achieved. Based on multi-channel seismic profiles interpretation and data analysis of long-term observation of bottom currents, we identified that although the amounts of sediments input from the Pearl and Hanjing Rivers, and from Kao-ping and Tseng-Wen Rivers are large, considering the current situation of northern SCS, none of the Pearl River, the Hanjiang River, the Kao-ping River and the Tseng-Wen River can maintain the deposition pattern of the northern SCS margin as the single source, especially to maintain the supper high sedimentation rate at the RDSD area. The Miocene drape formation (MDF) calmly draped over an unconformity after rifting stage resulting in a relatively constant thickness of about 2000 m throughout the overall northern SCS continental margin, and followed by a standard configuration of a clinoform, the Pliocene formation and another clinoform of about another 700 m in total thickness. Due to Dongsha uplift since 3 Ma, roughly 1/2 of MDF and the N-2 formation in the Dongsha area measures 150 km by 200 km were denudated resulting in an average annual denudation rate of 60 x 10(6)t/y. If these sediments were deposited on a slope region within an area measuring 100 km by 100 km, the sedimentation rate could reach 250 cm/ky. This is clearly an impressive new sediment source that has never been discussed before. Moreover, the RDSD is near the Dongsha Uplift and on the adjacent slope. We believe that this new sediment source should be the main contributor for the RDSD development.
机译：南中国海北部（SCS）的斜坡是现代海洋沉积过程中世界上最活跃的地区之一。在东沙岛附近的斜坡上发现了快速沉积的泥沙漂移（RDSD）。该机构的来源已由多位作者进行了研究和讨论，但尚未达成共识。基于多通道地震剖面解释和长期观测海底流的数据分析，我们认为，尽管考虑到珠江和汉江，高平河和曾文河的沉积物输入量很大，在北部南海的现状下，珠江，汉江，高平河和曾文河都不能作为单一来源保持北部南海边缘的沉积模式，特别是要保持超高的沉积RDSD区域的速率。中新世悬垂地层（MDF）在裂谷阶段后不整合上平静地覆盖，导致整个南海北部大陆边缘的厚度相对恒定，约为2000 m，然后是斜长形，上新世形成和另一斜长形的标准构造。总厚度约为700 m。由于自3 Ma以来的东沙隆起，东沙地区大约150 km×200 km的中密度纤维板和N-2地层被剥蚀，导致年平均剥蚀率为60 x 10（6）t / y。如果这些沉积物沉积在面积为100 km x 100 km的斜坡区域，则沉积速率可能达到250 cm / ky。这显然是令人印象深刻的新沉积物来源，以前从未讨论过。此外，RDSD位于东沙隆起附近，并在相邻的斜坡上。我们认为，这种新的沉积物来源应成为RDSD发展的主要贡献者。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第3期|118-133|共16页
  • 作者

    Luan Xiwu; Ran Weimin; Wang Kuo; Wei Xinyuan; Shi Yanfeng; Zhang Hao;

  • 作者单位

    China Geol Survey, Qingdao Inst Marine Geol, 62 Fuzhounan Rd, Qingdao 266071, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China;

    China Geol Survey, Qingdao Inst Marine Geol, 62 Fuzhounan Rd, Qingdao 266071, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China;

    Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China|China Univ Petr, Qingdao 266580, Peoples R China;

    Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China|Shandong Univ Sci & Technol, Qingdao 266590, Peoples R China;

    Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China|China Univ Petr, Qingdao 266580, Peoples R China;

    Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China|China Univ Petr, Qingdao 266580, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    The Northern South China Sea Slope; Rapidly deposited sediment drifts; Miocene drape formation; The Dongsha Uplift; Bottom current; Sedimentary source;

    机译：南海北部斜坡;快速沉积的泥沙漂移;中新世褶皱形成;东沙隆起;底流;沉积源;

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