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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
Yuan, Hongqing1,2,3; Shen, Ping1,2,3; Pan, Hongdi4
2018-10-01
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号165页码:210-227
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.
关键词Tuwu porphyry copper deposit Mineralized veins Fluid inclusions Sulfur isotope Mineral chemistry Fluid evolution
DOI10.1016/j.jseaes.2018.07.018
资助者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
关键词[WOS]ASIAN OROGENIC BELT ; FREEZING-POINT DEPRESSION ; ORE-FORMING PROCESSES ; CU DEPOSITS ; GEOLOGICAL SIGNIFICANCE ; ISOTOPE GEOCHEMISTRY ; CHEMICAL-COMPOSITION ; BINGHAM PORPHYRY ; HOST PORPHYRIES ; TRACE-ELEMENT
语种英语
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]
资助者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
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000449447300013
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89433
专题矿产资源研究院重点实验室
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
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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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