Understanding sedimentation in the Song Hong–Yinggehai Basin, South China Sea
Understanding sedimentation in the Song Hong–Yinggehai Basin, South China Sea
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DOI：
10.1029/2011gc003533
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发表时间：
2011-06
期刊：
影响因子：
3.7
通讯作者：
Yi Yan;A. Carter;C. Palk;S. Brichau;Xiaoqiong Hu
中科院分区：
文献类型：
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作者：
Yi Yan;A. Carter;C. Palk;S. Brichau;Xiaoqiong Hu
南海新生代宋洪-莺歌海盆地含有大量的沉积物，在以前的研究中，与区域地貌一起，论证了连接西藏东部和南海的大型古水系的存在。为了验证这一点，并了解沉积在宋洪-莺歌海盆地的沉积量的意义，本研究比较了源区的侵蚀历史与沉积量在两个主要阶段在盆地演化跨越活动裂陷和沉降（30-15.5马）和裂后沉积（15.5马到现在）。通过碎屑锆石U-Pb测年对盆地物源的研究表明，海南是一个重要且连续的沉积物来源，基岩热年代学研究量化了其对盆地沉积的总体贡献。盆地沉积物的累积质量和侵蚀基岩的体积之间的比较，计算从磷灰石热年代学在整个现代红河排水在北方越南以及海南岛，占沉积物的大部分自30马。因此，如果一个扩大的古水系曾经存在，它必须早于渐新世。
The Cenozoic Song Hong–Yinggehai Basin in the South China Sea contains a large volume of sediment that has been used in previous studies, together with regional geomorphology, to argue for the existence of a large palaeodrainage system that connected eastern Tibet with the South China Sea. To test this and to understand the significance of sediment volumes deposited in the Song Hong–Yinggehai Basin, this study compared erosion histories of source regions with sediment volumes deposited during the two main stages in basin evolution spanning active rifting and subsidence (30–15.5 Ma) and postrift sedimentation (15.5 Ma to present). The study of basin provenance by detrital zircon U‐Pb dating revealed Hainan was an important and continuous source of sediment, and a bedrock thermochronological study quantified its overall contribution to basin sedimentation. Comparison between the accumulated mass of basin sediment and volumes of eroded bedrock, calculated from apatite thermochronometry across the modern Red River drainage in northern Vietnam as well as Hainan Island, accounted for the bulk of sediment deposited since 30 Ma. Consequently, if an expanded paleodrainage ever existed it must have predated the Oligocene.