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首页> 外文期刊>Marine and Petroleum Geology >Detrital zircon provenance record of the Oligocene Zhuhai Formation in the Pearl River Mouth Basin, northern South China Sea
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Detrital zircon provenance record of the Oligocene Zhuhai Formation in the Pearl River Mouth Basin, northern South China Sea

机译：北洋南海珠江口盆地珠江珠海珠海珠海珠海地区的滴乳锆石源记录

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摘要

The Oligocene Zhuhai Formation has been proven to be one of the main reservoirs in the Pearl River Mouth Basin in the northern South China Sea but its sedimentary provenance remains uncertain and controversial. Here we conducted a systematic study by U-Pb analysis of detrital zircon of the Zhuhai Formation in order to identify the source terrane, investigate the sedimentary source, and establish the framework for the provenance variation during the Oligocene. The study suggests that the detrital zircon in the different structural units reveal marked spatial differences in their age compositions that correlate with the changing sources. The western and eastern parts of the basin have a significantly different provenance manifested by the age compositions of the detrital sediments. The western basin generally has a relatively complex age spectrum and is characterized by a multi-peak distribution, suggesting that the main source was derived from the southern margin of the South China Block. In contrast, the eastern basin displays a dominant population ranging from 131 to 142 Ma, which implies that the sediments were mainly eroded from a nearby source. Our data demonstrate that the Cathaysia Block hinterland and the intrabasinal sources provided dominant provenance contributions to the Pearl River Mouth Basin during the Oligocene. Additionally, Hainan Island and Central Vietnam (eastern Indochina Block) do not appear to have been important sources, whereas Luzon Island and northern Palawan probably provided negligible contributions to the basin during the same time period.
机译：珠珠珠海组织已被证明是南海北部珠江口盆地的主要水库之一，但其沉积物仍然不确定和争议。在这里，我们通过对珠海地层甲板锆石的U-PB分析进行了系统研究，以确定源地带，调查沉积来源，并建立寡核苷酸期间的出种变化框架。该研究表明，不同结构单元中的滴乳锆石揭示了与变化来源相关的年龄组合物中显着的空间差异。盆地的西部和东部部位具有脱胶沉积物的年龄组成具有显着不同的出处。西部盆地通常具有相对复杂的年龄谱，其特征在于多峰值分布，表明主要来源来自南方南部的南部边缘。相比之下，东部盆地显示出从131到142 mA的主导人群，这意味着沉积物主要从附近的来源中侵蚀。我们的数据表明，长生物在寡核苷期间为珍珠河口盆地提供了主导地区的主导出处。此外，海南岛和越南市中心（东吲哚块）似乎并不是重要的来源，而吕宋岛和北·巴拉川可能在同一时间段内为盆地提供了可忽略的贡献。

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