Provenance of a prominent sediment drift on the northern slope of the South China Sea
Provenance of a prominent sediment drift on the northern slope of the South China Sea
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DOI：
10.1007/bf02907084
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发表时间：
2001-10
期刊：
影响因子：
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通讯作者：
L. Shao;Xian‐Hua Li;G. Wei;Yuanfang Liu;D. Fang
中科院分区：
文献类型：
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作者：
L. Shao;Xian‐Hua Li;G. Wei;Yuanfang Liu;D. Fang
东沙群岛东南部1.05Ma以来的沉积物漂移速率高达49 cm/ka。虽然沉积速率随时间变化，但沉积物中稀有元素的含量基本保持不变，表明沉积物的源区随时间变化是恒定的。在La-Th-Sc和Th-Sc-Zr/10三角图上，东沙群岛东南部的样品与台湾样品重叠，属于大陆岛弧区，而珠江和菲律宾西部的火山岩样品则与台湾样品分离。这表明东沙群岛东南部的沉积物与台湾的沉积物在物源上有密切的关系。事实上，南海北方陆坡的沉积物来自东北方向，也来自台湾，很可能是从台湾经澎湖海峡进入南海。南海北部深海沉积物的陆源部分由不同物源提供。
The sedimentation rate of the sediment drift in the southeast of Dongsha Islands is as high as 49 cm/ka in the last 1.05 Ma. Although the sedimentation rate changes with time, the contents of rare elements of the sediments remain almost the same, indicating that the source area of the sediments has been constant with time. On the triangular diagrams of La-Th-Sc and Th-Sc-Zr/10, the samples from the southeast of Dongsha Islands fall within the continental island arc field, overlapping the samples from Taiwan, while the samples from the Pearl River, those from the west of the Philippines that contain volcanic material, are separated from them. This indicates that the sediments from the southeast of Dongsha Islands have a close relationship to those from Taiwan in terms of provenance. In fact, the sediments on the northern slope of the South China Sea were derived from northeast direction, as well as from Taiwan, most probably transported from Taiwan through Penghu channel into the South China Sea. The terrigenous part of the deep-sea sediments in the north of the South China Sea was provided by different sources.