Study on electrical structure and uranium metallogenic environment of basalt-covered area in the northern Erlian Basin
Yu Xiang1,2(), Wang Shuo3(), Hu Ying-Cai3, Duan Shu-Xin3
1. Department of Energy and Power Engineering, Tsinghua Vniversity, Beijing 100084, China 2. China Nuclear Geology, Beijing 100029, China 3. CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology,Beijing 100029, China
Sandstone type uranium deposits in Erlian Basin are concentrated in the Ba-Sai-Qi ancient channel. The northern part of the channel is mostly covered by basalt, which increases the difficulty of uranium exploration. According to the electrical characteristics of the basalt-covered area, the audio frequency magnetotelluric survey (AMT) was optimized and carried out to obtain uranium metallogenic information such as fracture, sand body, basalt distribution, basement, and tectonic framework, providing deep electrical data support for evaluating the prospecting prospect in the area. There are ternary electrical structures-basalt cap, sedimentary strata and basement rock in basalt-covered area. The sand bodies and fractures of Saihan Formation favorable for uranium mineralization are well developed in the area, and the deep thermal fluid can provide heat source for uranium superimposed mineralization. Uranium accumulation in sedimentary strata near basalt caprock should be considered in uranium exploration, and also uranium source conditions. Therefore, it is suggested to find out the NNW-trending fracture distribution in the west of basalt-covered area so as to provide a basis for uranium exploration of hydrothermal superimposed mineralization.
喻翔, 汪硕, 胡英才, 段书新. 二连盆地北部玄武岩覆盖区电性结构与铀成矿环境研究[J]. 物探与化探, 2022, 46(5): 1157-1166.
Yu Xiang, Wang Shuo, Hu Ying-Cai, Duan Shu-Xin. Study on electrical structure and uranium metallogenic environment of basalt-covered area in the northern Erlian Basin. Geophysical and Geochemical Exploration, 2022, 46(5): 1157-1166.
Nie F J, Li M G, Deng J Z, et al. Multiple type uranium deposit assemblage and uranium exploration in Erlian rift basin, Inner Mongolia[J]. Mineral Deposits, 2015, 34(4):711-729.
Wu Q B, Chen C, Yang L Q, et al. Study of integrated geophysical characteristics of paleo-valley sandstone-type uranium deposits in the middle of the Erlian Basin[J]. Acta Geologica Sinica, 2021, 95(8): 2521-2536.
Liu B, Yang J X, Peng Y B, et al. Study of structure and formation in uranium-bearing paleo-valley and typical metallogenic models in eastern part of Erlian Basin[J]. Mineral Deposits, 2017, 36(1):126-142.
Kang S H, Yang J X, Liu W S, et al. Mineralization characteristics and potential of paleo-valley type uranium deposit in central Erlian Basin,Inner Mongolia[J]. Uranium Geology, 2017, 33(4):206-214.
[6]
Bonnetti C, Cuney M, Bourlange S, et al. Primary uranium sources for sedimentary-hosted uranium deposits in NE China: Insight from basement igneous rocks of the Erlian Basin[J]. Mineralium Deposita, 2017, 52(3): 297-315.
doi: 10.1007/s00126-016-0661-0
Qi J F, Zhao X Z, Li X P, et al. The distribution of early cretaceous faulted-sags and their relationship with basement structure within Erlian Basin[J]. Earth Science Frontiers, 2015, 22(3): 118-120.
Lu C, Jiao Y Q, Peng Y B, et al. Effect of the episodic rifting in the western Manite depression in Erlian Basin on sandstone type uranium mineralization[J]. Acta Geologica Sinica, 2016, 90(12):3483-3491.
Liu B, Yang J X, Qin Y W, et al. Research on the ore-controlling genetic facies of the sandstone-type uranium deposits in the paleovalley of Saihan Formation of the Erlian Basin[J]. Geology and Exploration, 2016, 52(6):1037-1047.
Liu B, Miao A S, Peng Y B, et al. Research advances in uranium metallogenic characteristics, mechanism and dynamic background in the Mesozoic-Cenozoic basins of the Xingmeng area, North China[J]. Acta Geologica Sinica, 2020, 94 (12):3689-3711.
[14]
Ho K S, Liu Y, Chen J C, et al. Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts,Inner Mongolia: Implications for petrogenesis and mantle process[J]. Geochemical Journal, 2008, 42:339-357.
doi: 10.2343/geochemj.42.339
[15]
Zhang M L, Guo Z F. Origin of Late Cenozoic Abaga-Dalinuoer basalts, eastern China: Implications for a mixed pyroxenite-peridotite source related with deep subduction of the Pacific slab[J]. Gondwana Research, 2016, 37:130-151.
doi: 10.1016/j.gr.2016.05.014
Feng Z B, Nie F J, Jiang L, et al. Correlation of gravity field characteristics with sandstone-type uranium deposit and its geological significance[J]. Geoscience, 2014, 28(4):841-849.
Feng Z B, Nie B F, Nie F J, et al. Application progress of geophysical methods in exploration of sandstone-type uranium deposit[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1179-1188.
Nie F J, Yan Z B, Xie F, et al. Hot fluid flows in the sandstone-type uranium deposit in the Kailu basin, Northeast China[J]. Geological Bulletin of China, 2017, 36(10):1850-1866.