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Nd isotopic variations and its implications in the recent sediments from the northern South China Sea

机译：Nd同位素变化及其对南海北部近期沉积物中的影响

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The chondrite-normalized REE distribution patterns in recent sediments from the northern South China Sea and surrounding areas are similar, with the HREE values being almost equal to or slightly higher, and the La-N/Lu-N ratio being lower, than PAASstandards. However, samples from the Xijiang River, a major branch of the Pearl River system, show opposite trends, i.e., with slightly lower HREE values and higher La-N/Lu-N ratio than PAAS. The distribution of Nd isotopes in sediments from the northern South China Sea was controlled by the Pearl River and the inshore area of South China, respectively. The volume of epsilon(Nd)(0) from inshore areas of southern China is apparently higher than that from the Pearl River, and epsilon(Nd)(0) values in offshore sediments and Taiwan Island are between these values. The results clearly show that epsilon(Nd)(0) volume in the northeastern South China Sea is higher than in the southwest part of the northern South China Sea, indicating different source rock types. The main source rock of the Pearl River sediment is carbonate types and affects sediment deposition in the southwest of the northern South China Sea, while the source rock in the inshore area of southern China, mainly Mesozoic and Cenozoic granites,contributes to sediments in the northeastern area of the northern South China Sea. Due to different source rock types, the HREE values and the volume of epsilon(Nd)(0) in recent sediments supplied by the inshore area of southern China are higher than those from the Pearl River. Over 80% of the rapidly accumulated sediments on the northern slope of the South China Sea in the southeast of Dongsha Islands area were derived from Taiwan Island and from inshore areas of South China, with only less than 20% from the Pearl River.
机译：南海北部和周边地区最近沉积物中的球粒陨石归一化REE分布模式相似，HREE值几乎等于或稍高于PAAS标准，La-N / Lu-N比更低。但是，珠江水系的主要分支-西江的样本显示出相反的趋势，即与PAAS相比，HREE值略低，La-N / Lu-N比略高。南海北部沉积物中Nd同位素的分布分别受珠江和华南沿岸地区控制。中国南方近海地区的ε（Nd）（0）量明显高于珠江，而近海沉积物和台湾岛中的ε（Nd）（0）值在这些值之间。结果清楚地表明，南海东北部的epsilon（Nd）（0）量高于南海北部的西南部，表明烃源岩类型不同。珠江沉积物的主要烃源岩为碳酸盐类型，影响着南海北部西南部的沉积物沉积，而中国南部近海的烃源岩主要为中生代和新生代花岗岩，为东北部的沉积物。南海北部地区。由于源岩类型不同，中国南方近海地区最近沉积物中的HREE值和ε（Nd）（0）的量均高于珠江。在东沙群岛地区东南部的南海北坡，迅速堆积的沉积物中80％以上来自台湾岛和华南沿海地区，只有不到20％来自珠江。

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