The submarine Miocene Central Canyon and Pleistocene channel systems in the Qiongdongnan Basin constitute valuable sedimentary records that provide insight into the depositional processes and sediment routing from the hinterland to the deep sea. However, the primary source of sediment for the Pleistocene channel systems and the variation in relative sediment contributions since the Miocene from potential source terranes remain unknown. We have integrated new and published detrital zircon U–Pb ages and rare earth elements (REEs) from Pleistocene channel sands and late Miocene Central Canyon sands in the Qiongdongnan Basin to analyse the sediment routing system of these channel systems since the Miocene. Qualitative analyses of REEs, comparisons of detrital zircon age spectra, and multidimensional scaling plots suggest that the Red River is a significant source of sediment supply. The quantitative analysis of sediment mixing models indicates that the Pleistocene channel sands were mainly sourced from the Red River (62.8%–85.7%), followed by Central Vietnam rivers (4.8%–27.1%), with a minor amount derived from rivers in Hainan Island, Northern Vietnam and Southern Vietnam. Sand sediments, mainly from the Red River system, were deposited in the Yinggehai Basin, then transported and deposited again in the Qiongdongnan Basin. The relatively stable and major sediment supply from the Red River since the Miocene may have been driven by the uplift of the Tibetan Plateau. This study quantifies the relative provenance contributions to submarine channel systems in the Qiongdongnan Basin since the Miocene. It provides crucial geological implications for tectonic responses to channel migrations and the prediction of gas hydrates in sandy reservoirs.

中文翻译：

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量化中新世以来琼东南盆地海底航道系统的相对物源贡献：对构造响应和航道迁移的影响


琼东南盆地的海底中新世中央峡谷和更新世通道系统构成了有价值的沉积记录，为了解沉积过程和从腹地到深海的沉积路线提供了见解。然而，更新世河道系统的主要沉积物来源以及自中新世以来潜在来源地层的相对沉积物贡献的变化仍然未知。我们整合了琼东南盆地更新世河道砂和晚中新世中央峡谷砂土中新的和已发表的碎屑锆石 U-Pb 年龄和稀土元素 （REE），以分析自中新世以来这些河道系统的沉积物路由系统。稀土元素的定性分析、碎屑锆石年龄光谱的比较和多维比例图表明，红河是沉积物供应的重要来源。沉积物混合模型的定量分析表明，更新世河道沙主要来源于红河 （62.8%–85.7%），其次是越南中部河流 （4.8%–27.1%），少量来自海南岛、越南北部和越南南部的河流。主要来自红河水系的砂沉积物沉积在莺歌海流域，然后运输并再次沉积在琼东南流域。自中新世以来，红河相对稳定且主要的沉积物供应可能是由青藏高原的隆起驱动的。本研究量化了中新世以来琼东南盆地海底航道系统的相对物源贡献。它为构造对河道迁移的响应和砂质储层中天然气水合物的预测提供了重要的地质意义。