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稀土元素分析方法研究及应用—以渤海湾盆地东营凹陷永安地区物源分析为例

REE ANALYSIS METHOD AND APPLICATION-TAKING SOURCE ROCKS IN YONGAN REGION OF THE DONGYING SAG,THE BOHAI BAY BASIN AS EXAMPLE

    摘要
  • 摘要: 通过稀土元素(REE)的电感耦合等离子体发射光谱仪(ICP-AES)分析方法的建立和完善,在对渤海湾盆地东营凹陷永安地区开展稀土元素分析的基础上,初步建立了永安地区母岩区太古界、古生界、中生界以及沉积区沙四段和沙三段各层段的稀土元素分布形式.通过母岩区与沉积区稀土元素分布特征对比,完成了沉积区沙四段和沙三段的物源分析.永安地区沉积区沙四段与母岩区中生界、下古生界稀土元素分布特征最相似;沉积区沙三中、下亚段与母岩区中生界、下古生界稀土元素分布特征相似,兼有太古界稀土元素分布特征;沉积区沙三上亚段稀土元素分布形式与母岩区太古界稀土元素特征相似.沉积区与母岩区稀土元素分布特征的差异性,反映了古近系沙四段、沙三段各时期物源的不同.

     

    Abstract: With REE ICP-AES,based on analysis of REE in Yongan region of the Dongying Sag of the Bohai Bay Basin,REE distribution patterns of parent rocks(Ar,Pz,Mz) and sedimentary rocks(Es4 and Es3) are set up.Comparing REE distribution characteristics of parent rocks with sedimentary rocks,provenance of Es4 and Es3 in sedimentary region is analyzed.REE characteristics of Es4 in sedimentary zone and Mesozoic and Lower Paleozoic in parent rock zone are the most similar.REE characteristics of the middle and lower Es3 in sedimentary zone are similar with that of Mesozoic,Lower Paleozoic and Archaeozoic in parent rock zone.REE characteristics of the upper Es3 are similar with that of Archaeozoic in parent rock zone.The above mentioned differences in REE distribution indicate different sources during Es4 and Es3 periods.

     

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