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Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization
Zhang, Long1,2,3; Li, Xiaofeng1,2,3; Wang, Guo4; Wang, Mou4; Yang, Wenlong4; Zhang, Lei4; Zhu, Yiting1,2,3
2019-08-01
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume111Pages:18
AbstractThe Baiyanghe Be-U deposit is located in the Xuemisitan volcanic belt of the northwest margin of the Junggar plate, NW China. It is the largest beryllium deposit in Asia, but the physicochemical conditions of ore precipitation and mechanisms of transportation and precipitation of Be and U are still poorly constrained. Here we present detailed petrographic study, whole-rock major and trace elements of the host rocks, and mineral chemistry of this deposit to address these issues. The alteration minerals associated with Be-U mineralization mainly include fluorite, hematite, quartz, chlorite, manganese oxides, and muscovite. Fluorite is generally colorless, green, or light purple to dark purple in this deposit. The colorless and green fluorite and calcite display low concentrations of Be and U. The light purple to purple fluorite is characterized by high Be concentration but low U concentration. The dark purple fluorite shows high concentrations of Be and U. Both primary mica in the Yangzhuang granite porphyry and hydrothermal muscovite in the ore are enriched in F (4.26-7.78 wt%, 4.22-6.70 wt% respectively). These results indicate that the ore-forming fluids were enriched in F, and this deposit might have experienced at least two hydrothermal events that are responsible for the precipitation of Be and U minerals. All investigated chlorites are trioctahedral and belong to Fe-chlorites, and they precipitated at temperatures of 125-200 degrees C. Thermochemical constraints suggest that the ore-forming fluids had logfO(2) about - 25 to - 30 and pH about 4.5-5.2. Our study indicates that the Yangzhuang granite porphyry may represent the primary sources of Be and U, and that post-magmatic hydrothermal processes accompanied with extensive hydrothermal alteration caused remobilization of Be, U, and other elements from the granite porphyry. Both Be and U were mainly transported as fluoride complex ions, as indicated by the abundant fluorite and other Fbearing gangue minerals. The contact zones between the granite porphyry and Devonian volcanic rocks provide favorable reservoirs for Be and U minerals. The precipitation of Be was mainly resulted from the decreasing temperature and fluorine concentration in fluids, and the decreasing fO(2) and increasing pH were responsible for the precipitation of U.
KeywordHydrothermal alteration Mineral chemistry Precipitation mechanisms Be-U mineralization Baiyanghe deposit
DOI10.1016/j.oregeorev.2019.102972
Funding OrganizationChina National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation
WOS KeywordCENTRAL-IBERIAN ZONE ; CHEMICAL-COMPOSITION ; WEST JUNGGAR ; THERMODYNAMIC PROPERTIES ; ZHUGUANGSHAN COMPLEX ; CRYSTAL-STRUCTURE ; PHASE-EQUILIBRIA ; GRANITE PORPHYRY ; SOLID-SOLUTION ; MO DEPOSIT
Language英语
Funding ProjectChina National Nuclear Corporation[LTD1603]
Funding OrganizationChina National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation ; China National Nuclear Corporation
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000484869200017
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93565
Collection矿产资源研究院重点实验室
Corresponding AuthorLi, Xiaofeng
Affiliation1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.China Natl Nucl Corp, Geol Survey 216, Urumqi 830011, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang, Long,Li, Xiaofeng,Wang, Guo,et al. Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization[J]. ORE GEOLOGY REVIEWS,2019,111:18.
APA Zhang, Long.,Li, Xiaofeng.,Wang, Guo.,Wang, Mou.,Yang, Wenlong.,...&Zhu, Yiting.(2019).Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization.ORE GEOLOGY REVIEWS,111,18.
MLA Zhang, Long,et al."Hydrothermal alteration and mineral chemistry of the giant Baiyanghe Be-U deposit in Xinjiang, northwest China: Implications for its mineralization".ORE GEOLOGY REVIEWS 111(2019):18.
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