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首页> 外文期刊>Geochemistry, geophysics, geosystems >Detrital zircon provenance of the Paleogene syn-rift sediments in the northern South China Sea
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Detrital zircon provenance of the Paleogene syn-rift sediments in the northern South China Sea

机译：南海北部古近系同裂陷沉积物的碎屑锆石物源

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The early rift sedimentation history of the South China Sea is still not well understood due to restricted borehole coverage of the Paleogene strata and lack of reliable stratigraphic dating. We use detrital zircon U-Pb geochronology to explore the source-to-sink characteristics of syn-rift sequences in the northern South China Sea. The results reveal significant intrabasinal provenances in addition to the well-perceived terrigenous supply from the north. The Dongsha Uplift is considered to account for the dominance of the Early Cretaceous zircons in the Eocene samples. The Lower Oligocene sediments in the Qiongdongnan Basin could have been sourced from Hainan Island and local uplifts, but their distinction cannot be confirmed by the U-Pb age spectra. Contemporary sediments in the northern Pearl River Mouth Basin were most likely transported from southeastern South China with well-rounded zircon grains showing U-Pb age similarity to those from the northeastern tributaries of the Pearl River. By contrast, intrabasinal sources from the west and east are suggested to have contributed the infill of the southern part of the Pearl River Mouth Basin based on generally euhedral zircon shapes. These sedimentary source patterns appear to change very little in the Oligocene northern South China Sea. However, the newly detected Neoproterozoic zircons in the Upper Oligocene sediments from borehole L21 tend to indicate a southern source. The episodic and diachronic nature of rifting and erosion processes in the early South China Sea is the cause of complex patterns in the Paleogene provenance history.
机译：由于古近系地层的井眼覆盖受限以及缺乏可靠的地层测年，南中国海的早期裂谷沉积历史仍未得到很好的理解。我们使用碎屑锆石U-Pb年代学来探索南海北部同裂隙序列的源-汇特征。结果表明，除了北部地区公认的陆源供应外，还有大量的基底内物源。东沙隆起被认为解释了始新世样品中早白垩世锆石的优势。琼东南盆地的下渐新统沉积物可能来自海南岛和局部隆升，但不能通过U-Pb年龄谱来区分它们。珠江口盆地北部的当代沉积物最有可能是从华南东南部运来的，锆石颗粒呈圆形，其U-Pb年龄与珠江东北支流的年龄相似。相比之下，建议根据西方和东部的基本内部来源，根据总体上为正体锆石形状，对珠江口盆地南部的填充做出贡献。在南渐新世北部渐新世，这些沉积物来源模式似乎变化不大。但是，在L21井眼的上渐新世沉积物中新发现的新元古代锆石往往表明是南方来源。南中国海早期裂谷和侵蚀过程的间歇性和历时性是古近纪起源史中复杂模式的原因。

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