Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea
Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea
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南海西北海南岛西南海域晚更新世三角洲地震特征及沉积记录
DOI：
10.1190/int-2018-0012.1
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发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
Zhang W
中科院分区：
文献类型：
--
作者：
Feng Y;Zhan W;Chen H;Jiang T;Zhang J;Osadczuk A;Yao Y;Li W;Sun J;Guo L;Huang W;Li S;Zhang W
利用高分辨率地震资料和岩心资料，研究了南海西北部海南岛近海一个超过[公式：见文]的晚更新世三角洲（海南古河流三角洲，以下简称HNPD），以了解末次冰期水下三角洲发育与气候驱动因素的关系。地震资料显示，海南岛西南近海东坡沉积物总体呈西南或东南方向的进积构型，表明其主要向西南、东南方向运移。三角洲沉积物的平均厚度约为35 m，呈弧形环绕东坡。因此，HNPD的沉积物来源主要来自红河流域和海南岛。岩心测年结果与全球海平面曲线对比表明，三角洲主要形成于海相同位素阶段4 （65 ~ 56 ka）。盆地地形、海平面由低到高的变化以及冰期强烈冬季季风驱动的南向洋流对三角洲的形成都有促进作用。由于三角洲的发育需要大量的河流泥沙输入，我们推测三角洲发育停止的主要原因是河道沿东坡的迁移。根据已发表的海平面曲线的古水深情景与地震剖面和岩心的三角洲地层对比，我们确定了海南岛西南海岸的相对海平面可能在65 ~ 56 ka之间，这也可能适用于更广泛的地区，即南海北部。
A late Pleistocene delta (Hainan palaeo river delta, HNPD hereafter) exceeding [Formula: see text] offshore Hainan Island, northwestern South China Sea (SCS), is investigated using high-resolution seismic and core data to understand the relationship between subaqueous delta development and climate drivers during the Last Glacial Period. The seismic data indicate general progradational configurations toward the southwest or southeast, indicating that the sediments from the eastern slope offshore southwestern Hainan Island were transported southwestward and southeastward. The average thickness of the delta sediment is approximately 35 m, and it has an arcuate shape surrounding the eastern slope. Therefore, the sediment provenances of the HNPD were mainly from the Red River drainage and Hainan Island. Comparison between the core dating results and the global sea-level curve indicates that the delta formed mainly during marine isotope stage 4 (65–56 ka). The topography of the basin, the sea-level change from low stand to high stand, and the southward oceanic currents driven by the glacial-period strong winter monsoon all contributed to the formation of the delta. Because the development of the delta required large riverine sediment input, we speculate that the main reason that the delta’s development ceased was the migration of the river channel along the eastern slope. Based on a comparison between the palaeobathymetric scenarios derived from published sea-level curves and the delta stratigraphy identified from the seismic profiles and cores, we have determined a possible range of relative sea level between 65 and 56 ka for the southwestern coast of Hainan Island, which might also be applicable for a broader region, i.e., the northern SCS.
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影响因子：
3
作者：
Mai Thanh Tan;Le Van Dung;Phan Thien Huong
通讯作者：
Phan Thien Huong
影响因子：
3
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
64.8
作者：
J. Schmidt
通讯作者：
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DOI：
10.1144/sp429.9
发表时间：
2016-05
期刊：
Special Publications
影响因子：
--
作者：
Hongjun Chen;J. Harff;Y. Qiu;A. Osadczuk;Jinpeng Zhang;M. Tomczak;Zhaoguo Cui;Guangqiang Cai;Ming-ming Wen;Liqing Li
通讯作者：
Hongjun Chen;J. Harff;Y. Qiu;A. Osadczuk;Jinpeng Zhang;M. Tomczak;Zhaoguo Cui;Guangqiang Cai;Ming-ming Wen;Liqing Li