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南海莺歌海与琼东南盆地交界区碎屑沉积物的地球化学特征及物源分析。

Geochemical characteristics and provenance of the detrital sediments in the junction area of Yinggehai and Qiongdongnan basins, South China Sea.

机构信息

Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan, 430074, China.

School of Earth Resources, China University of Geosciences, Wuhan, 430074, China.

出版信息

Sci Rep. 2023 Jan 30;13(1):1667. doi: 10.1038/s41598-023-28778-8.

DOI:10.1038/s41598-023-28778-8
PMID:36717583
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9886981/
Abstract

Together, the Yinggehai and Qiongdongnan basins have received a large amount of terrigenous sediments, but the provenance evolution of Cenozoic sediments in the two basins remains disputable. Combined with previous studies in the Yinggehai and Qiongdongnan basins, the elemental geochemistry of Oligocene to Pliocene sediment samples in the junction area of the two basins were analyzed to explore the tectonic implications, parent rock characteristics, and provenance evolution of the two basins during the Cenozoic. The results reveal that all the sediment samples were derived from continental island arc to passive continental margin settings. The light REE enrichment and stable content of heavy REE with large negative Eu anomalies indicate that they were probably derived from Hainan Island. The reconstructed provenance evolution model showed that the Red River Source (RRS) provided sedimentary materials for the Central Depression of Yinggehai Basin from the Oligocene to the Pliocene, and Hainan Island Source (HIS) was also one of the sources for sediments deposited in the Central Depression of Yinggehai Basin during the Miocene. However, most of the sediments preserved in the Yingdong Slope and Qiongdongnan Basin were derived from the HIS from the Oligocene to the Pliocene, and sediments deposited in the Yingdong Slope were also derived from the RRS during the Miocene. Furthermore, the junction area of the two basins had a mixed source of the RRS and HIS during the Cenozoic.

摘要

莺歌海和琼东南盆地共同接受了大量陆源沉积物，但两个盆地新生代沉积物的物源演化仍存在争议。结合前人在莺歌海和琼东南盆地的研究，对两个盆地交界处上新世至更新世沉积样品的元素地球化学进行了分析，以探讨新生代两个盆地的构造意义、母岩特征和物源演化。结果表明，所有的沉积样品都来源于大陆岛弧到被动大陆边缘环境。轻稀土元素的富集和重稀土元素的稳定含量以及大的负铕异常表明，它们可能来自海南岛。重建的物源演化模型表明，红河源（RRS）在渐新世至更新世期间为莺歌海盆地中央坳陷提供了沉积物质，而海南岛源（HIS）也是中新世莺歌海盆地中央坳陷沉积物的来源之一。然而，在渐新世至更新世期间，莺东斜坡和琼东南盆地大部分沉积物都来自 HIS，而在中新世，莺东斜坡沉积物也来自 RRS。此外，新生代两个盆地交界处的物源具有 RRS 和 HIS 的混合来源。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/88238080660d/41598_2023_28778_Fig12_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/88238080660d/41598_2023_28778_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/cb57ef6db129/41598_2023_28778_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/f2f3ee6005e5/41598_2023_28778_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/73f980eab1f9/41598_2023_28778_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/0f8c0413952f/41598_2023_28778_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/e271e83d65ec/41598_2023_28778_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/31636693913d/41598_2023_28778_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/b9dc5bb96fe4/41598_2023_28778_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/fb2934b7996e/41598_2023_28778_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/87bce5f29f39/41598_2023_28778_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/76ca638d6b1d/41598_2023_28778_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/07b06bb6fc5f/41598_2023_28778_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/357c/9886981/88238080660d/41598_2023_28778_Fig12_HTML.jpg

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