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The characteristics of tourmaline in Baiyanghe U-Be deposit and its implications for mineralization, Xinjiang
Zhu YiTing1,2,3; Li XiaoFeng1,2,3; Zhang Long1,2,3; Wang Guo4; Zhang Di1,2
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:11Pages:3429-3442
AbstractThe Baiyanghe U-Be deposit is located in the Late Paleozoic Xuemisitan-Kulankazi island arc of the northwestern margin of the Junggar plate, Northwest China. It is the largest Be deposit (2. 2Mt of ore with grades ranging from 0. 2% to 1. 4%) in Asia. Orebodies in the deposit occur as fractures along contact zones between the Yangzhuang granite porphyry intrusion and Devonian pyroclastic country rocks and within the porphyry itself. Hydrothermal alteration minerals observed in the ores include hematite, fluorite, quartz, chlorite, and muscovite. Field and microscopic observations show that the fluorite, hematite, and muscovite are closely associated with U-Be-Mo mineralization. The primary U-bearing mineral is pitchblende, and the secondary U-bearing mineral is uranophane. The Be-bearing mineral is bertrandite, which mainly occurs as fine planar and 20 similar to 300 mu m long prismatic crystals within the dark purple fluorite veins. The gangue minerals are quartz, albite, K-feldspar, sericite, chlorite, and fluorite. Three types tourmaline were identified by their occurrences, e. g. hosted in basalt, in tuff and in granite in Baiyanghe U-Be-Mo deposit. Tourmaline occurred as spherical aggregate in basalt and tuff, some of which as fractures, whereas tourmaline hosted in granite occurred as veins. Tourmaline in tuff has obvious zonation. Based on field observation and petrography, the mineral chemistry of tourmaline is studied by using electron microprobe analysis. The results show that the tourmaline in Baiyanghe U-Be deposit belongs to the alkali schorl, but much differences exist by their occurrence. Tourmaline in basalt rich in Ti, Mg, Ca, and poor in Al, Mn, F. Tourmaline in tuff rich in Fe, Na, and poor in Mg, Ca. Tourmaline in granite rich in Al, Mn, F, and poor in Ti, Fe and Na. All of the tourmaline show the high F (0. 343 similar to 1. 117apfu) and Al (5. 648 similar to 7. 351apfu) concentration. The variation of chemical composition in tourmaline in Baiyanghe U-Be deposit suggests the interactions of exchange vector might exist, such as Al-YX square( Y+Na)(-1), Al-YX square(Y+ OH)(-1), FeMg-1, Fe3+ Al--(1), AlO(MgOH)(-1) and AlO( Fe3+OH)(-1). Tourmaline chemical composition indicates that the fluid which precipitated tourmaline rich in Al and F. Be may migrate mainly as fluoride or fluorine complex and U migrate mainly as fluoride or fluorocarbon in hydrothermal fluid. The precipitation of tourmaline or fluorite results in the instability of fluoride or fluorine complexes which containing U and Be, leading to the precipitation beryllium and uranium precipitated from hydrothermal fluids.
KeywordTourmaline Chemical composition Granitic porphyry U-Be deposit Baiyanghe
DOI10.18654/1000-0569/2019.11.11
WOS KeywordBORON ISOTOPIC COMPOSITIONS ; NORTHERN WEST JUNGGAR ; ATHABASCA BASIN ; FLUID EVOLUTION ; COMPOSITIONAL EVOLUTION ; TECTONIC IMPLICATIONS ; ELEMENT GEOCHEMISTRY ; PALEOZOIC PLUTONS ; GRANITE PORPHYRY ; MOLDANUBIAN ZONE
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000510188200011
PublisherSCIENCE PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95665
Collection矿产资源研究院重点实验室
Corresponding AuthorLi XiaoFeng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 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
4.216 Geol Survey, China Natl Nucl Corp, Urumqi 830011, Peoples R China
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhu YiTing,Li XiaoFeng,Zhang Long,et al. The characteristics of tourmaline in Baiyanghe U-Be deposit and its implications for mineralization, Xinjiang[J]. ACTA PETROLOGICA SINICA,2019,35(11):3429-3442.
APA Zhu YiTing,Li XiaoFeng,Zhang Long,Wang Guo,&Zhang Di.(2019).The characteristics of tourmaline in Baiyanghe U-Be deposit and its implications for mineralization, Xinjiang.ACTA PETROLOGICA SINICA,35(11),3429-3442.
MLA Zhu YiTing,et al."The characteristics of tourmaline in Baiyanghe U-Be deposit and its implications for mineralization, Xinjiang".ACTA PETROLOGICA SINICA 35.11(2019):3429-3442.
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