渤海东部晚更新世以来的沉积物地球化学特征  

Geochemical Characteristics of Sediments in the Eastern Bohai Sea since Late Pleistocene

作　　者：蓝先洪[1,2] 秦亚超[1,2] 王中波[1,2] 陈晓辉[1,2] 密蓓蓓[1,2] 黄龙[1,2] 

机构地区：[1]国土资源部海洋环境与油气地质重点实验室青岛海洋地质研究所,山东青岛266071 [2]青岛海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《沉积学报》2016年第5期892-901,共10页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(41330964;41406077);国土资源部海洋区域地质调查项目(GZH200800501;GZH201400205;GZH201400201;DD20160137)~~

摘　　要：为探讨渤海东部晚更新世以来的元素地球化学特征及控制因素, 对渤海东部DLC70-1孔157个沉积物样品 进行了化学成分、 粒度及测年分析.结果表明, 晚更新世以来研究区沉积物的物质来源与沉积环境较为稳定; 根据 DLC70-1孔沉积物地球化学特征, 钻孔岩芯可划分为6层, 反映了末次间冰期（ 暖期） 晚期以来渤海东部沉积物物源的 变化以及海面波动.Al2O3、 MgO、TFe2O3、 MnO、 TiO2、 Cu、 Zn、 Pb、Cr和 Rb等元素与细粒沉积物呈正相关, SiO2、Na2O 与粗粒沉积物呈正相关, K2O 、Sr和 Ba分布与沉积物粒度无明显正或负的相关性;R-型因子分析得出三种主要组合类 型, 以 Mg、Sr和 Ba为代表, 分别对应陆源细粒物质输入与黄河物质、 海河物质和深河物质的影响.运 用 BVAI2O3与 Sr/Al2O3、 MgO/Al2O、 K2O/Al2O3离散图分析了 DLC70-1孔的物质来源, 结果表明沉积物主要来源于黄河, 该孔中上 部 32.30-49.00m和 9.30-23.20 m沉积物受到了深河和海河物质的影响.157 sediment samples were collected from Core DLC70-1 in the eastern Bohai Sea.These samples were analyzed lor major and trace elements, grain size parameters, Cl4dating and OSL dating with the purpose ol studying the geochemical characteristics of elements and controlling factors in the eastern Bohai Sea since Late Pleistocene.The results show that sediment sources and depositional environments of the study area remained relatively stable since Late Pleistocene. According to the changing law ol element contents, the sediments from Core DLC70-1 can be divided into six layers, reflecting the fluctuation ol sea level and the change ol sediment sources in Bohai Sea since the late ol the last interglacial cycle （warm period） .The Al2O3, MgO, TFe2O3, MnO, TiO2, Cu, Zn, P b , Cr and Rb elements were positively correlated with the line-grained sediments, and SiO2, Na= O was positively correlated with coarse-grained sediments. There was no significant positive or negative correlation between K2O, Sr and Ba distributions and grain size ol sediment. Three groups representing respectively by Mg, Sr and Ba can be derived lrom R-model lactor analysis, corresponding to the impact ol the input ol line-grained terrigenous sediments and Yellow River sediment, Haihe River sediments, Luanhe River sediments. Combined with scatter diagram ol Ba/ Al2O3 vs. Sr/Al2O3, MgO/ Al2O3 vs. K2O/ Al2O3 were drawn to reveal the source ol sediments from Core DLC70-1. The results suggest that the material sources ol the core mainly come lrom the Yellow River, but the sediments in the upper-middle parts ol the core were apparently inlluenced by materials lrom the Luanhe River and Haihe River.

关 键 词：渤海东部 地球化学 沉积物 晚更新世 

分 类 号：P736.4[天文地球—海洋地质] P59[天文地球—海洋科学]