Distribution Characteristic and Geological Significance of Rare Earth Element in Mudstoneof the Lower Permian Shanxi Formation in the South of Yanchuan Area,Ordos Basin

XIE Guo-liang，SHEN Yu-lin，WEI Zhan-hang，ZHANG Hu，YUAN Xue-xu

doi:10.11764/j.issn.1672-1926.2013.05.991

2013 , Vol. 24 >Issue 5: 991 - 998

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.05.991

Distribution Characteristic and Geological Significance of Rare Earth Element in Mudstoneof the Lower Permian Shanxi Formation in the South of Yanchuan Area,Ordos Basin

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1.School of Resource and Geoscience,CUMT,Xuzhou 221008,China;
2.Key Laboratory of CBM Resource and Reservoir-Generating Process,China Ministry of Education,Xuzhou 221008,China

Received date: 2013-01-25

Revised date: 2013-04-17

Online published: 2013-10-10

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Abstract

Through ICP-MS analysis,measurements of rare earth element and trace element are conducted by using 30 mudstone samples in the Lower Permian Shanxi Formatio，south of Yanchuan area,for the research on REE geochemical characteristics and its geological application.The result shows that the amount of ∑REE of mudstone (93.80 to 746.47×10^-6) is high.The ratios of w(LREE/ HREE) (1.28 to 9.97) and (La/Yb)N (1.97 to 28.78) show that the differentiation of LREE and HREE is significant.The correlation between ∑REE and external elements,like Ti,Ni,Pb,Rb,Ga,Cr,Zn,is very good,while the correlation between ∑REE and the marine elements,like Zn and Mn,is not obvious,which indicated that REE is mainly supplied by terrigenous minerals.The Ce_anom（-0.089-0.138,more than -0.10）and δCe(0.91-1.35,average 1.09) show that the water environment in the study area in Shanxi Formation is anoxic reduction.The distribution patterns of REE and ∑REE-(La/Yb)N diagram show that the source rocks of samples mostly consist of granite,sedimentary rock and may be multi-source.And analysis result shows that the direction of source is coming from the north of the studied area,which may be the active continental margin uplift basement sources and a small part of continental island arc magmatite provenance.Moreover,there is a relationship between the sequence boundaries (SB1,SB4) with the abnormal surfaces of ∑REE,(La/Yb)N,δCe,V/(V+Ni),V/Cr trace and REE geochemical characteristics near the sequence boundaries.

Key words： Rare earth element; The source of REE; Source; Shanxi Formation; The south of Yanchuan area

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XIE Guo-liang，SHEN Yu-lin，WEI Zhan-hang，ZHANG Hu，YUAN Xue-xu . Distribution Characteristic and Geological Significance of Rare Earth Element in Mudstoneof the Lower Permian Shanxi Formation in the South of Yanchuan Area,Ordos Basin[J]. Natural Gas Geoscience, 2013 , 24(5) : 991 -998 . DOI: 10.11764/j.issn.1672-1926.2013.05.991

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