Sedimentary Environment, Tectonic Setting, and Uranium Mineralization Implications of the Yimin Formation, Kelulun Depression, Hailar Basin, China

Author:

Meng Fanmin1,Nie Fengjun12,Xia Fei12,Yan Zhaobin12,Sun Da12,Zhou Wenbo3,Zhang Xin12,Wang Qing1

Affiliation:

1. School of Earth Sciences, East China University of Technology, Nanchang 330013, China

2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China

3. Geological Party No. 243, China National Nuclear Corporation, Chifeng 024000, China

Abstract

The sandstone-type uranium deposit of the Kelulun Depression is the first industrially valuable uranium deposit discovered in the Hailar Basin. This study performed a systematic examination of 17 sandstone samples from the Yimin Formation in the Kelulun Depression based on various analytical techniques. The findings of the current study were synthesized with previous research to investigate the impact of the redox conditions and the tectonic background of the source area, as well as the paleoclimatic evolution of the Yimin Formation on uranium mineralization. The elemental Mo, U/Th, V/Cr, Ni/Co, and V/(V + Ni) ratios indicate that the paleowater was in an oxygen-rich environment during the deposition of the Yimin Formation. Additionally, the C-value, Sr/Cu, Al2O3/MgO, and Rb/Sr ratios indicate that the Yimin Formation was formed in a paleoclimate characterized by arid-to-semi-arid conditions. The geochemical characteristics of the observed elements indicated that the sediment source of the Yimin Formation was mainly felsic rocks from the upper continental crust, the weathering of the rock was weak, and the tectonic background was a passive continental margin. Coffinite is distributed in the form of cementation and stellates within or around pyrite crystals, and uranium-titanium oxide is mostly distributed in an irregular granular distribution in the biotite cleavage fractures of the study area. In summary, the findings of this study reveal that the tectonic settings, provenance, uranium source, paleoclimate, and oxygen-rich paleowater of the Yimin Formation have important geological significance for the large-scale uranium mineralization of the Kelulun Depression.

Funder

Mechanism of constraints of the basin and range coupling on uranium mineralization in the southern Great Xing’an Range and its lateral basins

Metallogenic theory on sandstone-type uranium deposits and innovation of key technology as well as application of industry-university-research on uranium exploration

Study on Mechanism of Uranium Ultra Enrichment and Exploration Potential for Sandstone-type Uranium Deposit Hosted in the Cretaceous, Ordos Basin

Publisher

MDPI AG

Reference79 articles.

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2. Characteristics of Sandbodies in Zalailuoer depression and analysis of uranium exploration direction;Ma;Uranium Geol.,2011

3. The distribution and enrichment of Uranium in groundwater of Hailar Basin;Zhang;China Environ. Sci.,2021

4. Application of Airborne Radioactivity Survey Data in Mineralization Prospect of Sandstone-type Uranium Deposit in Hailar Basin;Zhong;Geol. Resour.,2010

5. Evolution of depositional system and uriniferous characteristics of Damoguaihe Formation in Kelulun Sag;Zhang;Uranium Geol.,2005

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