莱州湾07钻孔沉积物晚更新世以来的元素地球化学特征

发布时间：2018-07-02 23:22

本文选题：莱州湾 + 地球化学　；参考：《海洋学报》2016年03期

【摘要】：在莱州湾南岸的07孔岩心进行高分辨率采样的基础上,采用X荧光光谱法(XRF)、离子质谱法(ICP-MS)以及原子荧光光谱法(AF)等方法测试了研究区07孔的48种常微量元素以及稀土元素的含量,并对元素相对含量、随深度变化规律、特征比值以及稀土元素配分模式进行了研究。结果表明,07孔主要元素及特征比值在海陆地层分界处有明显变化,可以作为地层划分的指标之一。其中,Mn、Mg、Ca、Fe、Mg/Ca及K/Na等对沉积环境响应比较明显,Ba、Zr、Rb、Si/A1、Ti/A1和Rb/Sr对源区的母岩类型、风化程度及搬运距离的变化敏感;07孔常微量元素垂向变化较大,在3次海侵地层中呈明显变化,并对应多个峰值。化学元素的变化规律所反映的地层特征与晚更新世以来的气候和海平面的变化有较好的对应关系。07孔不同深度沉积物的稀土元素球粒陨石标准化配分模式与黄河沉积物的相似,呈轻稀土元素富集的右倾型。说明黄河是莱州湾南岸弥河-潍河多源河流三角洲沉积体系的物源之一,且对莱州湾南岸一定深度范围内的沉积地层有部分贡献。
[Abstract]:On the basis of high-resolution sampling of the core of hole 07 along the south coast of Laizhou Bay, The contents of 48 trace elements and rare earth elements were measured by X-ray fluorescence spectrometry (XRF), ion mass spectrometry (ICP-MS) and atomic fluorescence spectrometry (AF). The characteristic ratio and the REE partition model were studied. The results show that the main elements and the ratio of characteristics are obviously changed at the stratigraphic boundary of Qiang07 well, which can be used as one of the indexes of stratigraphic division. Among them, the response of Fe / Ca / Ca and K / Na to sedimentary environment is obvious. The changes of source rock type, weathering degree and transport distance are sensitive to the change of source rock type, weathering degree and transport distance, and the vertical variation of trace elements is obvious in three transgressions. And corresponding to multiple peaks. The stratigraphic characteristics reflected by the variation of chemical elements have a good correspondence with the climate and sea level changes since the late Pleistocene. The normalized distribution model of chondrites in the sediments of hole .07 is similar to that of the Yellow River sediments. It is a right-dip type enriched with light rare earth elements. It is shown that the Yellow River is one of the provenances of the multi-source river delta system on the southern bank of Laizhou Bay, and it also contributes partly to the sedimentary strata in a certain depth along the southern bank of the Laizhou Bay.
【作者单位】：中国石油大学地球科学与技术学院;青岛海洋地质研究所国土资源部海洋油气资源和环境地质重点实验室;青岛海洋地质研究所中国地质调查局滨海湿地生物地质重点实验室;山东省第四地质矿产勘查院;
【基金】：国家海洋地质保障工程专项(GZH201200505) 国家自然科学基金(41406082) 山东省自然科学基金(ZR2014DQ010)
【分类号】：P736.4

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