Restoration of sedimentary paleoenvironment of Neogene Baode Formation in Xiabaodang Coal Mine
In order to restore the sedimentary paleoenvironment of Neogene Baode Formation in Xi-aobaodang Coal Mine,the paleoclimate,paleosalinity,paleoredox and water depth of the red soil layer of Neogene Baode Formation in Xiaobaodang Coal Mine were studied by geochemical methods.The re-sults show that the modified CIAcorr index,Al2O3/MgO,MgO/CaO,CaO/(MgO·Al2O3),Sr/Cu and Rb/Sr value of Baode Formation in Xiabaodang Coal Mine indicate the moderate weathering conditions of warm and wet,with alternating changes of drought-wet and cold-warm.Sr,Li,Ga,Rb/K2O indicate that the sedimentary environment of Baode Formation is fresh-brackish water.Fe2+/Fe3+,Ni/Co,V/Cr,V/(V+Ni),δU,δCe and Cu/Zn indicate that Baode formation is oxidizing environment and local oxygen-poor environment.The content of Co indicates that the paleo-water depth of Baode Formation is alternately deep and shallow.The study can restore the sedimentary paleoenvironment of Baode Forma-tion in Xiabaodang Coal Mine,and provide the basis for the paleoenvironment restoration of other strata and other areas.
万方数据
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