林西—乌兰浩特地区铀成矿多源信息分析与成矿预测

doi:10.11720/wtyht.2019.1353

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Abstract

Located in the south-central part of Da Hinggan Mountains uranium metallogenic province, Linxi-Ulanhot area is characterized by strong tectonic magmatic activity and favorable geological conditions for uranium mineralization. Limited by such factors as vegetation development and thick cover, it is difficult for the single exploration method to meet the demand of the current deep prospecting. Based on the analysis of ore-forming conditions and ore-controlling factors, the authors constructed a comprehensive volcanic-type uranium ore comprehensive prospecting model by integrating such pieces of multivariate information as airborne radioactivity, aeromagnetic survey, geochemistry and remote sensing. Using spatial analysis function of the geographic information system (GIS), the authors extracted the multivariate prospecting information, carried out quantitative prognosis for uranium ore by evidence weighting method, and selected 16 evidence layers closely related to mineralization. Among them, the Upper Jurassic Manketouebo Formation is the main ore-bearing strata, the Late Jurassic-Early Cretaceous subvolcanic rocks are closely related to ore formation, the ore-controlling effect of NE-NNE trending fracture is significant, and uranium mineralization is mostly developed in the fault-dense zone and the intersection zone. Such anomalies as airborne radioactive anomalies (U high field, F high value halo, U/K high value halo, Hu low value halo), geochemical anomalies (Mo, Ag, Pb, W, Sn) and remote sensing alterations (Iron alteration, hydroxy alteration) play important roles in the indication of volcanic uranium mineralization. According to the posterior probability determined by the evidence weight method, 18 prospective areas were delineated, covering most uranium deposits (ore spots) in the area, indicating that the prediction results are reliable. In seven of them, uranium deposits (ore spots) were found for the first time. All these places have excellent metallogenic geological conditions, rich prospecting clues and good prospecting prospects, and the results obtained by the authors have certain guiding significance for further prospecting.

Key words： uranium mineralization multivariate information metallogenic prediction Linxi-Ulanhot area

Received: 26 September 2018 Published: 25 October 2019

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	Articles by authors
	En ZHANG
	Ming DUAN
	Hui-Xiong LU
	Bo FENG
	Qiu-Yi CAO
	Yan-Chao YANG

Cite this article:

En ZHANG,Ming DUAN,Hui-Xiong LU, et al. An analysis of multivariate uranium metallogenic information and metallogenic prognosis in Linxi-Ulanhot area[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 948-957.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1353 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/948

Multi-source prospecting informations for uranium deposits in the region

Distribution of main ore-bearing strata in Linxi-Ulanhot area
1—Baiyingaolao formation;2—Manitu formation;3—Manketou Obo formation;4—uranium deposit and uranium occurrences and uranium mineralization point;5—study area

Distribution of faults in Linxi-Ulanhot area
1—regional fault;2—general fault;3—uranium deposit and uranium occurrences and uranium mineralized site;4—study area

Mathematical model of airborne radioactive parameters and geological significance

Distribution of geochemical anomalies in Linxi- Ulanhot area
1—Cu anomaly;2—Pb anomaly;3—Zn anomaly;4—Mo anomaly;5—Ag anomaly;6—W anomaly;7—Sn anomaly;8—uranium deposit and uranium occurrences and uranium mineralized site;9—study area

Beneficial degree of rock formations

Beneficial degree of buffer zone of the Late Jurassic-Early Cretaceous sub-volcanic rocks

Beneficial degree of airborne radioactive characteristic parameters

Beneficial degree of each element anomaly

Weight value of evidence layers of uranium deposits

Prospective map of uranium mineralization in Linxi-Ulanhot area
1—regional fault、general fault;2—uranium deposit 、uranium occurrences、uranium mineralized site;3—volcanic basin and numbering;4—first prospective areas;5—second prospective areas;6—third prospective areas;7—prospective areas and numbering;8—study area

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