Using element geochemistry and detrital zircon geochronology to constrain provenance of the Eocene sediments in the deep-water area of the Pearl River Mouth Basin, South China Sea
Using element geochemistry and detrital zircon geochronology to constrain provenance of the Eocene sediments in the deep-water area of the Pearl River Mouth Basin, South China Sea
复制标题
利用元素地球化学和碎屑锆石年代学判别南海珠江口盆地深水区始新世沉积物的物源
DOI：
10.1016/j.jseaes.2020.104501
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发表时间：
2020-09
影响因子：
3
通讯作者：
Zhang He
中科院分区：
文献类型：
--
作者：
Li Yajun;Jiang Zhenglong;Liu Hao;Shi Chuang;Huang Yuping;Zhang He
白云凹陷是珠江口盆地珠二坳陷中最大的凹陷，位于欧亚板块、太平洋板块和印度板块相互作用的区域。 BYS主要经历了古近纪裂谷阶段和新近纪—第四纪后裂谷阶段。 BYS中厚的同裂谷沉积物记录了物源性质，并为南海开放之前的区域构造演化提供了极好的记录。在本研究中，元素地球化学分析结合已发表的锆石碎屑U-Pb测年结果，用于更好地了解始新世BYS的物源变化和构造背景。在这方面，来自六口井的始新世样品的球粒陨石归一化稀土元素模式与上大陆地壳（UCC）和太古代澳大利亚页岩（PAAS）高度相似，特别是在轻稀土元素富集、显着负Eu异常和轻微Ce异常方面。地球化学结果证实BYS始新世沉积物源自大陆岛弧至活动大陆边缘。此外，源岩类型和相对狭窄的碎屑锆石年龄表明，源自当地地形高点的中生代中长英质火成岩和变质岩对大部分BYS的充填做出了贡献。此外，研究结果表明，在南海开口之前的同裂谷活动阶段，番禺低隆起开始接受古珠江从华南沿岸输送的大量沉积物。
As the largest sag in the Zhu II Depression within the Pearl River Mouth Basin, the Baiyun Sag (BYS) lies in an area of interaction among the Eurasian Plate, Pacific Plate, and Indian Plate. The BYS mainly experienced the Paleogene rift stage and Neogene-Quaternary post-rift stage. Thick syn-rift sediments in the BYS have recorded the nature of provenance and provide an excellent record of regional tectonic evolution prior to the opening of the South China Sea. In this study, elemental geochemical analysis combined with published zircon detrital U-Pb dating results are applied to better understand the provenance change and tectonic setting of the BYS during the Eocene. In this respect, the chondrite normalized REE patterns of Eocene samples from six wells are highly similar to upper continental crust (UCC) and post-Archean Australian shale (PAAS), particularly with respect to LREE enrichment, significantly negative Eu anomalies, and slight Ce anomalies. Geochemical results confirm that the BYS Eocene sediments were derived from a continental island arc to an active continental margin. In addition, the rock types of sources and the relatively narrow detrital zircon ages show that Mesozoic inter-mediate-felsic igneous and metamorphic rocks derived from local topographic highs contributed to infilling most of the BYS. Furthermore, the results show that the Panyu Low Uplift began to accept large sediments transported by the paleo-Pearl River from the South China coast during the active syn-rift stage, prior to the opening of the South China Sea.
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影响因子：
3.9
作者：
Zhenyu He;Xi‐sheng Xu
通讯作者：
Zhenyu He;Xi‐sheng Xu
南海北部珠江口盆地渐新统珠海组碎屑锆石物源记录
影响因子：
4.2
作者：
Wang Ce;Wen Shunv;Liang Xinquan;Shi Hesheng;Liang Xirong
通讯作者：
Liang Xirong
二叠纪以来华南大陆边缘岩浆的开启与关闭：安第斯型板块边界向西太平洋型板块边界的转变
影响因子：
2.9
作者：
Li, Zheng-Xiang;Li, Xian-Hua;Chung, Sun-Lin;Lo, Ching-Hua;Xu, Xisheng;Li, Wu-Xian
通讯作者：
Li, Wu-Xian
影响因子：
1.8
作者：
Li You-chuan
通讯作者：
Li You-chuan
影响因子：
3.5
作者：
Ke Ru;J. Pigott
通讯作者：
Ke Ru;J. Pigott