二连盆地北部玄武岩覆盖区电性结构与铀成矿环境研究

doi:10.11720/wtyht.2022.0028

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Abstract

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.

Key words： sandstone-type uranium deposit basalt acoustic magnetotelluric method Erlian Basin mineralization

Received: 26 January 2022 Published: 03 January 2023

ZTFLH:

P631

Corresponding Authors: Wang Shuo E-mail: yuxiang219@126.com;spoonmiller@126.com

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	Xiang Yu
	Shuo Wang
	Ying-Cai Hu
	Shu-Xin Duan

Cite this article:

Xiang Yu,Shuo Wang,Ying-Cai Hu, et al. Study on electrical structure and uranium metallogenic environment of basalt-covered area in the northern Erlian Basin[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1157-1166.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.0028 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1157

Division of secondary tectonic units in Erlian Basin, Inner Mongolia

Geological conditions and AMT survey lines of basalt-covered area in Manite Depression
1—Quaternary; 2—Neogene Tongguer and Damiao formation; 3—Neogene Baogedewula formation; 4—Cretaceous Erlian formation; 5—Cretaceous Tengger formation; 6—Jurassic Xinganling group; 7—Jurassic Alatanheli group;8—Permian; 9—Carboniferous; 10—Devonian; 11—Silurian;12—Ordovician;13—Proterozoic; 14—Quaternary basalt; 15—Cretaceous basalt;16—Jurassic granite; 17—Triassic granite; 18—Permian diorite porphyrite;19—Permian granite;20—Carboniferous ultrabasic rock;21—Carboniferous diabase;22—Devonian ultrabasic rock; 23—Devonian gabbro; 24—geological boundary; 25—AMT line

Apparent resistivity(a) and phase curves(b) of AMT measuring points

Comparison of inversion resistivity section and drilling of L01 line

Inversion resistivity profiles(a),(c) and geological interpretation(b),(d) of 0~50 km and 50~99.6 km of L01 line

Inversion resistivity profiles(a),(c) and geological interpretation(b),(d) of 0~50 km and 50~99.6 km of L09 line

Plane comprehensive geological interpretation of basalt-covered area

Inferred three-dimensional geological model of lower Cretaceous Saihan Formation of basalt-covered area

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