渤海东部晚更新世以来的沉积物地球化学特征

发布时间：2018-05-05 20:50

本文选题：渤海东部 + 地球化学　；参考：《沉积学报》2016年05期

【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。Al_2O_3、MgO、TFe_2O_3、MnO、TiO_2、Cu、Zn、Pb、Cr和Rb等元素与细粒沉积物呈正相关,SiO_2、Na2O与粗粒沉积物呈正相关,K_2O、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、海河物质和滦河物质的影响。运用Ba/Al_2O_3与Sr/Al_2O_3、MgO/Al_2O_3与K_2O/Al_2O_3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32.30~49.00 m和9.30~23.20 m沉积物受到了滦河和海河物质的影响。
[Abstract]:In order to study the geochemical characteristics and controlling factors of elements in the eastern Bohai Sea since the late Pleistocene 157 sediment samples from the DLC70-1 pore in the eastern Bohai Sea were analyzed for chemical composition granularity and dating. The results show that the sediment source and sedimentary environment in the study area since the late Pleistocene are relatively stable, and the core of the borehole can be divided into six layers according to the geochemical characteristics of the sediments in the DLC70-1 pore. It reflects the changes of sediment sources in the eastern Bohai Sea since the late interglacial (warm period) and the sea surface fluctuation. Al2O3MgO- TFe2O3MgO- TFe2O3MnO- TiO-1, TiO2C, RB, etc., which are positively correlated with fine-grained sediments and the distribution of K _ 2O _ 2O _ (Sr) and Ba with coarse-grained sediments (C _ 2O _ 2Na _ 2O) and coarse-grained sediments (K _ 2O _ 2O _ (Sr) and Ba (Al _ 2O _ 2O _ 3) and the distribution of K _ 2O _ 2O _ (Sr) and Ba. The R- type factor analysis with no significant positive or negative grain size results in three main combination types. Taking MgO Sr and Ba as the representative, they correspond to the influence of the terrestrial fine grain material input to the Yellow River material, the Haihe River material and the Luanhe River material respectively. The material sources of the DLC70-1 pore were analyzed by using the discrete graphs of Ba/Al_2O_3, Sr-Al _ 2O _ 3, MgO / Als _ 2O _ 3 and K_2O/Al_2O_3. The results show that the sediment is mainly from the Yellow River, and the sediment of the middle and upper part of the hole 32.30 ~ 49.00 m and 9.30 ~ 23.20 m are influenced by the material of Luanhe River and Haihe River.
【作者单位】：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;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;
【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)~~
【分类号】：P736.4

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