Genesis and characteristics of lacustrine hydrothermal-sedimentary rock of the Lower Cretaceous in Yingejing sag of Bayan Gebi Basin, Inner Mongolia
Xiang Long1,2, Liu Xiao-Dong1,2, Liu Ping-Hui1,2, Dai Chao-Cheng1,2, Jiang Wen-Jian1,2
1 College of Earth Sciences,East China University of Technology,Nanchang 330013,China; 2 State Key Laboratory of Nuclear Resources and Environment,Nanchang 330013,China
Abstract：The Upper Member of Lower Cretaceous Bayingebi Formation in Yingejing sag,Bayan Gebi Basin,Inner Mongolia is the key pre-selected section of clay rock repository for China’s high-level radioactive waste(HLW). The studies of petrological,mineralogical and geochemical for the sedimentary rocks in this section show that the cores of hydrothermal-sedimentary rocks are dark-gray and gray,and have five typical structures,i.e. laminated and banded,stockwork,syngenetic deformation bedding,porphyritic massive structures. The hydrothermal-sedimentary rock is predominantly composed of dolomite,ankerite,analcime,illite,albite,and pyrite,which are typical minerals of exhalative sedimentary rocks. There are 4 types of hydrothermal-sedimentary rock based on the difference among major minerals. Geochemical characteristics confirm that the main elements are iron and manganese. The typical deep-source gas-liquid trace elements such as Mo,Sb,Zn,As,Sr and Ba are relatively abundant. The average value of $\sum$REE is 119.85 μg/g and is characterized by enrichment of light REE and depletion of heavy REE. There is no significant enrichment or loss of δCe(average value 0.99),and δEu shows a medium strong negative anomaly(average value 0.62). The values of δ18O are mainly negative bias,indicating the formation temperatures of lake-facies hydrothermal-sediments ranging from 40.41℃ to 64.87℃. The samples of Fe-Mn-(Cu+Ni+Co)-ternary diagram all fall into hydrothermal sediment area. The comprehensive analyses show that this is a set of low-temperature “white smoke type” hydrothermal sedimentary rock associated with magmatism and deep hydrothermal fluid under the mainly arid depositional environment within the brackish-saline lake. The 100-120Ma tectonic activity in the Altun fault zone was the main controlling factor for the formation of exhalative sedimentary rocks,which provided the migration pathway for dolomitized fluids. The study on hydrothermal-sedimentary rock with unique mineral composition provides scientific basis and new ideas for claystone geological disposal repository of China’ HLW.
Xiang Long,Liu Xiao-Dong,Liu Ping-Hui et al. Genesis and characteristics of lacustrine hydrothermal-sedimentary rock of the Lower Cretaceous in Yingejing sag of Bayan Gebi Basin, Inner Mongolia[J]. JOPC, 2019, 21(5): 709-726.
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