How did sediments disperse and accumulate in the oceanic basin, South China Sea
How did sediments disperse and accumulate in the oceanic basin, South China Sea
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南海洋盆中的沉积物是如何分散和堆积的
DOI：
10.1016/j.marpetgeo.2022.105979
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发表时间：
2022-10
影响因子：
4.2
通讯作者：
Ding W.W.
中科院分区：
文献类型：
--
作者：
Wang F.;Ding W.W.
南海沉积物堆积和扩散过程的量化不仅是东南亚“源-汇”过程的重要组成部分，而且还有助于揭示海底斜坡破坏和相关海底峡谷/通道的形成。基于对覆盖整个大洋盆地的30多条多道地震剖面的地质解释，结合IODP远征钻探成果的约束，计算了渐新世以来大洋盆地百万年地质尺度的沉积物收支。重建不同地质时期的沉积物等厚线图，以了解新生代沉积物堆积和分散过程的控制因素以及可能的沉积物源。结果表明，整个洋盆的沉积物收支随着时间的推移逐渐增加，尽管随时间的推移速率并不一致。它因区域构造而变得复杂，包括南海的扩张、青藏高原和台湾的隆起、亚洲季风的变化、河流系统的改道和组织以及海平面的变化。大陆边缘发育的海底河道/峡谷系统是陆地沉积物排入大洋盆地的主要通道。我们观察到西南次盆地晚中新世和西北次盆地上新世沉积物堆积速率出现了两次下降趋势。前者可能与湄公河陆架局部裂谷事件有关，该事件截留了大部分陆地输入。后者则是由于上新世晚期中央峡谷和珠江峡谷的退缩所致。沉积物等厚线图显示，晚中新世以前，沉积物堆积主要集中在南海洋盆北翼，沉积中心普遍分布在河道/峡谷体系口和基底高点附近的坡脚区；上新世以来主要沉积中心逐渐迁移至盆地南翼。这可能是由于湄公河沉积物增加和海平面上升所致。一个例外是东北部与台湾造山运动有关的新沉积中心的发展。主要沉积物源包括华南、青藏高原、中南半岛和台湾岛，海南岛、巴拉望岛、吕宋群岛以及大陆边缘发育的局部基底高点贡献较小。
Quantification of the sedimentary accumulation and dispersion process of the South China Sea (SCS) not only establishes an important part on the “source-to-sink” process in Southeast Asia, but also sheds lights on the submarine slope failure and associated submarine canyon/channels formation. Based on geological interpretations of more than 30 multichannel seismic profiles covering the whole oceanic basin with constraints from IODP Expedition drilling results, we calculated the sediment budget of the oceanic basin since the Oligocene on a million-year geological scale. Sediment isopach maps in different geological time were reconstructed to understand the controlling factors dominating the Cenozoic sedimentary accumulation and dispersion process, as well as the possible sedimentary provenances. Results show that the sediment budget of the whole oceanic basin increased gradually with time, although the rate has not been consistent over time. It was complicated by regional tectonics, including the spreading of the SCS, the uplift of the Tibet Plateau and Taiwan, changes in the Asian monsoon, rerouting and organization of the river systems, and sea level changes. Submarine channel/canyon systems developed in the continental margin acted as the major conduits for terrestrial sediments discharging into the oceanic basin. We observe two decrease trends in sediment accumulation rates occurred in the Southwest Sub-basin during the Late Miocene, and in the Northwest Sub-basin during the Pliocene. The former might be related with the local rifting event in the Mekong Shelf, which trapped most of the terrestrial input. While the later was due to the retreat of the Central Canyon and Pearl River Canyon in the Late Pliocene. Sediment isopach maps indicate that the sediment accumulation was dominantly in the northern flank of the SCS oceanic basin before the Late Miocene, with the depocenters generally distributed at the mouth of the channel/canyon systems and slope foot area near basement highs; the main depocenters gradually migrated to the southern flank of the basin since the Pliocene. This is likely due to an increase sediment from the Mekong River and the high sea level. An exception is the development of a new depocenter in the northeast related with the Taiwan orogeny. The primary sediment provenances include South China, Tibet Plateau, Indo-China Peninsula, and Taiwan Island, with minor contributions from the Hainan Island, Palawan, Luzon Islands, as well as local basement highs developed on the continental margin.
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影响因子：
2.9
作者：
Rui Zhao;Si Chen;Cornel Olariu;Ronald Steel;Jinyu Zhang;Hua Wang
通讯作者：
Hua Wang
大约自公元 1000 年以来，青藏高原向其北缘呈脉冲式上升和增长。
DOI：
10.1073/pnas.2120364119
发表时间：
2022-02-22
影响因子：
11.1
作者：
Wang W;Zhang P;Garzione CN;Liu C;Zhang Z;Pang J;Wang Y;Zheng D;Zheng W;Zhang H
通讯作者：
Zhang H
影响因子：
1.4
作者：
Li;Jiabiao;Jin;Xianglong;Gao;Jinyao
通讯作者：
Li;Jiabiao;Jin;Xianglong;Gao;Jinyao
DOI：
10.1007/s11430-014-4878-4
发表时间：
2014-08
期刊：
Science China Earth Sciences
影响因子：
--
作者：
M. Su;Cheng Zhang;Xinong Xie;Zhenfeng Wang;T. Jiang;Yunlong He;Cuimei Zhang
通讯作者：
M. Su;Cheng Zhang;Xinong Xie;Zhenfeng Wang;T. Jiang;Yunlong He;Cuimei Zhang
影响因子：
--
作者：
Pang Xiong
通讯作者：
Pang Xiong