肖倩文, 冯秀丽, 苗晓明. 南海北部神狐海域SH37岩芯浊流沉积及其物源分析[J]. 海洋地质与第四纪地质, 2021, 41(5): 101-111. DOI: 10.16562/j.cnki.0256-1492.2021011901
引用本文: 肖倩文, 冯秀丽, 苗晓明. 南海北部神狐海域SH37岩芯浊流沉积及其物源分析[J]. 海洋地质与第四纪地质, 2021, 41(5): 101-111. DOI: 10.16562/j.cnki.0256-1492.2021011901
XIAO Qianwen, FENG Xiuli, MIAO Xiaoming. Turbidity deposits and their provenance: evidence from core SH37 in Shenhu area of the South China Sea[J]. Marine Geology & Quaternary Geology, 2021, 41(5): 101-111. DOI: 10.16562/j.cnki.0256-1492.2021011901
Citation: XIAO Qianwen, FENG Xiuli, MIAO Xiaoming. Turbidity deposits and their provenance: evidence from core SH37 in Shenhu area of the South China Sea[J]. Marine Geology & Quaternary Geology, 2021, 41(5): 101-111. DOI: 10.16562/j.cnki.0256-1492.2021011901

南海北部神狐海域SH37岩芯浊流沉积及其物源分析

Turbidity deposits and their provenance: evidence from core SH37 in Shenhu area of the South China Sea

  • 摘要: 为了分析南海北部神狐海域的浊流沉积,对SH37岩心进行了沉积物粒度测试、AMS14C测年和地球化学元素测试等工作。根据粒度特征和C-M图等分析认为,200~300 cm层位属于浊流沉积,该层沉积物粒度较粗,分选较差,敏感粒级端元EM3与Zr/Rb元素比值在该层均含量较高,且有地层年龄倒转现象。推测浊流成因为海平面的变化或重力作用引起的陆坡滑坡。稀土元素含量与(La/Sm)UCC-(Gd/Yb)UCC、(Gd/Yb)UCC-(Gd/Lu)UCC散点图结果显示,SH37岩心沉积物来源较为一致,主要来自于珠江和台湾岛内河流。

     

    Abstract: In order to seek for the origin of the turbidite deposits in the Shenhu area of the northern South China Sea, grain size analysis, AMS14C dating and element geochemical analysis have been carried out for the core of SH37. Grain size distribution and C-M pattern suggest that the core deposits between the interval of 200~300 cm belong to turbidite deposits. The interval is composed of relatively coarse sediments with bad sorting, as EM3 and the ratio of Zr/Rb are rather high. A phenomenon of age reversal is observed. It is speculated that the turbidity current is probably triggered by sea level change or gravity. Rare earth elements and scatter plots of (La/Sm)UCC-(Gd/Yb)UCC and (Gd/Yb)UCC-(Gd/Lu)UCC suggest that the turbidite sediments are mainly sourced from the Pearl River system and the rivers on the Taiwan Island.

     

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