| 南海北部湾全新世以来沉积物地球化学特征及物源分析 |
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| 引用本文： | 崔振昂,侯月明,夏真,林进清,刘文涛,张亮.南海北部湾全新世以来沉积物地球化学特征及物源分析[J].世界地质,2015,34(3):605-614. |
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| 作者姓名： | 崔振昂 侯月明 夏真 林进清 刘文涛 张亮 |
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| 作者单位： | 1． 广州海洋地质调查局，广州 510760; 2． 广州海洋地质调查局 国土资源部海底矿产资源重点实验室，广州 510075; 3． 中海石油 (中国) 有限公司 深圳分公司研究院，广州 510240 |
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| 摘 要： | 为探讨全新世以来南海北部湾沉积物的沉积环境变化,对北部湾海域的SO-31沉积物柱状样进行了元素地球化学分析。根据元素地球化学的垂向分布特征,将SO-31沉积柱划分为3个单元,反映了全新世不同时期的区域海平面波动以及沉积物物源的变化。SO-31沉积柱的稀土元素配分曲线和La/Co与La/Sc散点图分析表明:111 400~12 800 a BP(全新世前期),研究区海平面较低,红河、其他周边河流及海岸侵蚀物均为本区的主要物源;28 500~1 1400 a BP(全新世早期),随着海平面的逐渐上升,河口和岸线逐渐后退,各物源供给区对本区沉积物的贡献量也发生了相应变化,相对而言红河贡献率有所下降;30~8 500 a BP(中全新世至今),区域海平面持续上升导致了琼州海峡打开,北部湾水动力环境和物源供给发生了剧变,红河对本区的物源贡献逐渐变小,而来自北部湾东部的物质成为本区沉积物的主要物源。
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| 关 键 词： | 全新世 地球化学 物质来源 北部湾 南海 |
Geochemical characteristics and provenance analysis of Holocene sediments in Beibu Gulf,South China Sea |
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| CUI Zhen-Ang,HOU Yue-Ming,XIA Zhen,LIN Jin-Qing,LIU Wen-Tao,ZHANG Liang.Geochemical characteristics and provenance analysis of Holocene sediments in Beibu Gulf,South China Sea[J].World Geology,2015,34(3):605-614. |
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| Authors: | CUI Zhen-Ang HOU Yue-Ming XIA Zhen LIN Jin-Qing LIU Wen-Tao ZHANG Liang |
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| Institution: | 1． Guangzhou Marine Geological Survey，Guangzhou 510760，China; 2． MLＲ Key Laboratory of Marine Mineral Ｒesources，Guangzhou Marine Geological Survey，Guangzhou 510075，China; 3． Ｒesearch Institute of Shenzhen Branch，CNOOC，Guangzhou 510240，China |
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| Abstract: | In order to understand the changes of depositional environment during the Holocene，the authors carried out geochemical investigations of the core sediments SO- - 31 from the Beibu Gulf，South China Sea． The SO - - 31 core sediments were divided into 3 sedimentary units according to vertical geochemical distribution， which indi- cated the changes of sea level and the variation of sediments provenance in the studying regions． Distribution pat- terns of rare earth elements (ＲEEs) and the scatter diagram of La/Covs La/Scof core SO- - 31 sediments suggest: ① 11 400 ～12 800 a BP: Beibu Gulf had relatively low sea level，the Ｒed Ｒiver and the western Hainan Island pro- vided most materials to the studying area; ② 8 500 ～11 400 a BP: The recession of the estuary and the coastline was due to sea level rising，and the contribution of provenance supply areas changed and that of the Ｒed Ｒiver de- creased; ③ 0 ～8 500 a BP: With the opening of the Qiongzhou Strait，the provenance and hydrodynamic condi- tions of the Beibu Gulf had undergone a significant change，and the materials from western Hainan Island and east- ern Qiongzhou Strait became the main sources for the core sediments，while Ｒed Ｒiver，however，contributed only little to the core sediments． |
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| Keywords: | Holocene geochemistry sediment provenance Beibu Gulf South China Sea |
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