当前位置：
X-MOL 学术
›
Ore Geol. Rev.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Key factors controlling volcanic-related uranium mineralization in the Xiangshan Basin, Jiangxi Province, South China: A review
Ore Geology Reviews ( IF 3.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.oregeorev.2020.103517 Fusheng Guo , Zenghua Li , Teng Deng , Mengmeng Qu , Wanpeng Zhou , Qinyi Huang , Pei Shang , Chengyong Zhang , Zhaobin Yan
Ore Geology Reviews ( IF 3.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.oregeorev.2020.103517 Fusheng Guo , Zenghua Li , Teng Deng , Mengmeng Qu , Wanpeng Zhou , Qinyi Huang , Pei Shang , Chengyong Zhang , Zhaobin Yan
Abstract The Xiangshan Basin hosts the largest volcanic-related uranium deposits in China. Despite several decades of extensive research, the key factors controlling volcanic-related uranium mineralization in the Xiangshan Basin remain unclear. In this paper, we present a review of previous studies and highlight the critical features that are closely related to the uranium mineralization in the Xiangshan Basin, with focus on the geological feathers, host rocks, ore-controlling structures, alterations, mineralization, fluid inclusions, and geochronological and geochemical data of the uranium deposits. Based on these reviews, a comprehensive genetic model is proposed to better explain the uranium mineralization mechanism. The uranium mineralization at Xiangshan is mainly hosted in felsic volcanic and sub-volcanic rocks, and spatially close to the Cretaceous–Tertiary redbeds. The mineralization mainly took place from ~125 to ~70 Ma, which is much younger than the ages of host volcanic rocks (~135 Ma) and broadly contemporaneous with the development of the redbed basins and mafic magmatism. The uranium mineralization occurs mainly as veins controlled by brittle structures such as fractures, faults and volcanic structures. The extensional reactivation of preexisting structures and development of new fractures created permeability for the circulation of the ore-forming fluids and provided spaces for uranium precipitation. The ore-forming fluids are characterized by basinal brines with a meteoric water origin, possibly mixed with mantle-derived fluids. The uranium was mostly contributed by the host volcanic and sub-volcanic rocks. The precipitation of uranium is related to redox reactions with reductants such as Fe2+, H2S and CH4 as well as other mechanisms related to change of physical and chemical conditions due to fluid boiling. The comprehensive review of the geological characteristics related to uranium mineralization reveals that the key factors controlling the uranium mineralization in the Xiangshan volcanic basin are related to the coupling of shallow (development of oxidizing fluids in the redbeds and brittle structures in the volcanic rocks) and deep-seated (thermal activities related to mafic magmatism) geological processes. It is proposed that meteoric water infiltrated into the high-permeability redbed basins, and evolved to oxidizing basinal fluids. The oxidizing fluids further circulated into the volcanic basin along brittle structures and extracted uranium from the volcanic rocks. The heat provided by mafic magmatic activities accompanying upward-flowing deep-source hot fluids promoted the uranium extraction and transportation.
更新日期：2020-07-01
京公网安备 11010802027423号