| 黄河三角洲ZK5钻孔沉积物地球化学特征及其沉积环境 |
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| 引用本文： | 宫少军,秦志亮,叶思源,乔吉果,赵卫.黄河三角洲ZK5钻孔沉积物地球化学特征及其沉积环境[J].沉积学报,2014,32(5):855-862. |
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| 作者姓名： | 宫少军 秦志亮 叶思源 乔吉果 赵卫 |
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| 作者单位： | 1.天津市海洋地质勘查中心 天津 300170; |
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| 基金项目： | 国家地质调查项目(编号:1212010611402);海保工程项目(编号:GZH201200503);天津市国土房管局科技项目(编号:国土房任[2013]5号);国家自然科学基金青年基金(批准号:41306057)联合资助 |
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| 摘 要： | 本文根据36件沉积物样品的微量元素和常量元素的相关性、组分含量及某些元素的比值特征，探讨了黄河三角洲ZK5钻孔的元素地球化学特征与古环境意义。应用历史地理学和沉积地质学综合分析方法确定钻孔岩芯沉积年代，将ZK5岩芯沉积物自下而上大致划分为7个层序。元素地球化学特征的研究表明:K2O、Fe2O3、Al2O3、TiO2、Cr、V、Rb元素相互间呈明显的正相关关系；SiO2与其他元素呈明显的负相关，与P2O5呈弱负相关关系；Sr与CaO呈弱负相关关系；P2O5与Al2O3、Fe2O3、K2O、TiO2、CaO呈弱的正相关。据V/Cr值分析，ZK5钻孔从下往上水体有逐渐加深的趋势，与相关性分析结果相符。根据锶钡比值（Sr/Ba）和镁铝比值102（MgO/Al2O3）分析得出，ZK5孔沉积环境的水体盐度从下往上变化相差不大，属于海相沉积环境，同时有黄河水的注入。通过古气候指示剂Rb/Sr值和MgO/CaO值的分析:ZK5孔从NQ1到NQ7层序沉积时期的气候变化不大，气候相对潮湿。总之，地球化学特征所反映的沉积环境与沉积相分析的结果相一致，说明元素地球化学与沉积环境关系密切，可作为沉积相判别的标志。
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| 关 键 词： | 黄河三角洲 相关分析 古环境 地球化学特征 沉积环境 |
| 收稿时间： | 2013-06-21 |
Geochemical Characteristics and Sedimentary Environment of ZK5 Core Sediments in Yellow River Delta |
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| Institution: | 1.Tianjin North China Geological Exploration Bureau, Institute of Geology, Tianjin 300170;2.Tianjin Exploration Center of Marine Geology, Tianjin 300170;3.National Marine and Hazard Mitigation Service, SOA, Beijing 100194;4.Qingdao Institute of Marine Geology, Qingdao, Shandong 266071 |
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| Abstract: | This study discussed the sedimentary geochemistry characteristics and the palaeosedimentary environmental significance of ZK5 core in Yellow River Delta, on the basis of geochemical analyses of 36 sediments samples. Applicating comprehensive analysis of historical geography and sedimentary geology to determine the depositional age of core sediments, and from the bottom to the top of the ZK5 sediment cores was divided into 7 sequences. The results of geochemistry characteristics indicated: K2O, Fe2O3, Al2O3, TiO2, Cr, V, Rb remarkably were positively correlated with each other; SiO2 was apparently negatively correlated with other elements, and weakly negatively correlated with P2O5; Sr and CaO weakly negatively correlated with each other; P2O5 was weakly positively correlated with Al2O3, Fe2O3, K2O, TiO2, CaO. The analytic result of the value of V/Cr revealed that the depth of sedimentary water increased from bottom to top in ZK5 core, and the variation regularities were consistent with the conclusions of sedimentary facies. The analytic result of the value of 102(MgO/Al2O3) and Sr/Ba revealed that the salinity was similar from the bottom to the top of ZK5 core, and belongs to marine sedimentary environment, while water injected from Yellow River. Based on the characters of Rb/Sr and MgO/CaO, climate conditions from NQ1 to NQ7 of ZK5 core have no more change, were deposited in warm-wet climate condition. In summary, the geochemical characteristics and the sedimentary environment are closely correlated, and the geochemical characteristics can be regarded as a mark in the sedimentary facies recognition. |
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