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Nature and evolution of hydrothermal fluids in the formation of the Tuwu porphyry copper deposit in the Eastern Tianshan Mountains, NW China

文献类型：期刊论文

作者Yuan, Hongqing1,2,3; Shen, Ping1,2,3; Pan, Hongdi4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-10-01
卷号165页码:210-227
关键词Tuwu porphyry copper deposit Mineralized veins Fluid inclusions Sulfur isotope Mineral chemistry Fluid evolution
ISSN号1367-9120
DOI10.1016/j.jseaes.2018.07.018
英文摘要The Tuwu porphyry copper deposit is located in the Eastern Tianshan Mountains, Xinjiang, China. Lentiform-likf ore bodies are hosted in the Early Carboniferous Qi'eshan group, and Cu mineralization shows a close association with tonalite porphyry. Porphyry and country rocks have undergone extensive potassic, chlorite-sericite, phyllit and propylitic alteration. The mineralized veins in the Tuwu deposit can be divided into: earlier quartz bio tite magnetite chalcopyrite veins (stage I), quartz chalcopyrite bornite pyrite veins (stage II) ant quartz molybdenite chalcopyrite pyrite calcite veins (stage III), and later calcite quartz vein: (stage N). The Stage H and III are the main Cu mineralization stages. At the Tuwu deposit, three types of fluic inclusions have been distinguished: liquid-rich (L-type), vapor-rich (V-type) and halite-bearing (S-type), re spectively. Laser Raman spectra identified magnetite, hematite, chalcopyrite, and pyrite at S-type inclusions. The quartz veins in stage I and II contain all inclusion types. L-type and V-type inclusions are recognized it stage HI quartz minerals, but only L-type inclusions are present in stage IV quartz minerals. Fluid inclusions it quartz of stage I, II, III and IV are characterized by homogenization temperature vary of 275-492 degrees C, 232-477 degrees C 199-287 degrees C and 133-227 degrees C, with corresponding NaCl (equiv). salinities of 2.2-58.7 wt% NaCl (equiv)., 1.4-58.3 wt9 NaCl (equiv)., 1.1-6.0 wt% NaCl (equiv)., and 1.1-4.2 wt% NaCl eq iv., respectively. Initial ore-forming fluids of du Tuwu deposit belong to relatively oxidized H2O-NaCI system with moderate-high temperature and salinity Sulfur isotope data from chalcopyrite and pyrite suggest a magmatic source. Two types of chlorite (type 1 ant type 2) are recognized based on the relationship with metal sulfides. Electron microprobe analysis shows tha chlorites are plotted in ripidolite and pycnochlorite. Decreasing Fe/(Fe + Mg) ratios of chlorites indicate that tlu meteoric water was involved in the magmatic water, combined with the positive correlation with ARV, implying that the chlorite formed in a relatively reduced and acidic environment. The hydrothermal fluids in type] chlorite bring large quantities of reduced metallic minerals compared to the barren fluids in type 2 chlorite. Tht formation temperatures of chlorite are roughly coincident with the results that obtained from fluid inclusior studies, which show a decrease trend. Changes in temperature, redox, pH, and fluid-rock interaction likely plat an important role in the transportation and precipitation of metal sulfides of the Tuwu deposit.
WOS关键词ASIAN OROGENIC BELT ; FREEZING-POINT DEPRESSION ; ORE-FORMING PROCESSES ; CU DEPOSITS ; GEOLOGICAL SIGNIFICANCE ; ISOTOPE GEOCHEMISTRY ; CHEMICAL-COMPOSITION ; BINGHAM PORPHYRY ; HOST PORPHYRIES ; TRACE-ELEMENT
资助项目National Key R&D Program of China[2017YFC0601201] ; National Natural Science Foundation of China[U1303293] ; National Natural Science Foundation of China[41272109] ; National Natural Science Foundation of China[41390442]
WOS研究方向Geology
语种英语
WOS记录号WOS:000449447300013
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/89433]  
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Shen, Ping
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 10029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 10029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Changan Univ, Coll Earth Sci, Xian 710054, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Yuan, Hongqing,Shen, Ping,Pan, Hongdi. Nature and evolution of hydrothermal fluids in the formation of the Tuwu porphyry copper deposit in the Eastern Tianshan Mountains, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,165:210-227.
APA Yuan, Hongqing,Shen, Ping,&Pan, Hongdi.(2018).Nature and evolution of hydrothermal fluids in the formation of the Tuwu porphyry copper deposit in the Eastern Tianshan Mountains, NW China.JOURNAL OF ASIAN EARTH SCIENCES,165,210-227.
MLA Yuan, Hongqing,et al."Nature and evolution of hydrothermal fluids in the formation of the Tuwu porphyry copper deposit in the Eastern Tianshan Mountains, NW China".JOURNAL OF ASIAN EARTH SCIENCES 165(2018):210-227.

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来源：地质与地球物理研究所

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