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Chemical and boron isotopic compositions of tourmaline at the Baiyanghe Be-U deposit, northwest China: Implications for Be-U mineralization

文献类型：期刊论文

作者Zhu, Yiting1,2,3; Li, Xiaofeng1,2,3; Zhang, Long1,2,3; Zhang, Di2,3; Wang, Chunzeng4
刊名CHEMICAL GEOLOGY
出版日期2021-05-20
卷号569页码:18
ISSN号0009-2541
关键词Tourmaline Beryllium and uranium mineralization Boron isotope Baiyanghe Northwest China
DOI10.1016/j.chemgeo.2021.120146
英文摘要Tourmaline records the physical and chemical conditions of the crystallization environment and preserves the information through younger magmatic-hydrothermal processes. Therefore, tourmaline is a favorable geochemical tracer and can be used to reveal processes that have contributed to the metallogenesis of hydrothermal deposits. The Baiyanghe deposit, located in the Xiemisitai Mountains, Northwest China, is the largest volcanogenic Be-U deposit in Asia. The deposit has three types of ores: U type, Be type, and Be-U type. These ores either occur separately or co-exist but have cross-cutting relationships. Major ore bodies occur as fracture fillings along contact zones between the Yangzhuang granite porphyry and the underlying Devonian volcanic rocks. Three types of tourmaline (e.g., hosted in the granite porphyry, rhyolitic crystal tuff, and basalt) were identified based on their occurrences, and seven sub-type tourmalines were clarified according to their textures and chemical compositions. They all belong to the alkali schorl group and rich in F. The low Al concentration (< 6 apfu) and Fe + Mg > 3 apfu tourmaline hosted in the rhyolitic crystal tuff suggest the substitution at Z site by Fe3+. The tourmalines hosted in the granite porphyry are rich in Li, Be, U, Ca, Ti, Cr, Y, Zr, Nb, Mo, Sn, Sb, Ta, and Th, whereas the tourmalines hosted in the rhyolitic crystal tuff and the basalt are rich in Mg, Sc, V, Co, Cu, Ni, Ga, and Sr, respectively. The delta B-11 value ranges from -5.94 parts per thousand to -4.48 parts per thousand, from -8.01 parts per thousand to -6.93 parts per thousand, and from -8.31 parts per thousand to -4.94 parts per thousand in the tourmalines hosted in the granite porphyry, the rhyolitic crystal tuff and the basalt, respectively. These data indicate that the chemical components that have contributed to the growth of tourmaline were derived from granitic magmas essentially. The oscillating zonation and the apparent variations of trace element compositions (e.g., Fe/(Fe + Mg) and Na/(Na + Ca) ratios) and REE patterns of the tourmalines indicate the involvement of periodic fluids and significant fluid-rock interaction, which are responsible for the precipitation of sub-type tourmalines. It is proposed that the tourmalines at the Baiyanghe deposit are the products of fluids exsolved from either a deep-rooted crystallizing magma chamber or one of the younger intrusions of the hosting composite granitic pluton in addition to the crystallizing the Yangzhuang granitic magma. The chemical and boron isotopic composition of tourmaline can provide a fingerprint to decipher the magmatic-hydrothermal process during the cyclic U-Be mineralization.
资助项目National Natural Science Foundation of China[41972087] ; Key Research Program of the Institute of Geology and Geophysics, CAS[IGG-CAS-201902]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000637385500006
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/101099]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Li, Xiaofeng
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Univ Maine Presque Isle, Presque Isle, ME 04769 USA
推荐引用方式
GB/T 7714		 Zhu, Yiting,Li, Xiaofeng,Zhang, Long,et al. Chemical and boron isotopic compositions of tourmaline at the Baiyanghe Be-U deposit, northwest China: Implications for Be-U mineralization[J]. CHEMICAL GEOLOGY,2021,569:18.
APA Zhu, Yiting,Li, Xiaofeng,Zhang, Long,Zhang, Di,&Wang, Chunzeng.(2021).Chemical and boron isotopic compositions of tourmaline at the Baiyanghe Be-U deposit, northwest China: Implications for Be-U mineralization.CHEMICAL GEOLOGY,569,18.
MLA Zhu, Yiting,et al."Chemical and boron isotopic compositions of tourmaline at the Baiyanghe Be-U deposit, northwest China: Implications for Be-U mineralization".CHEMICAL GEOLOGY 569(2021):18.

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来源：地质与地球物理研究所

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