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Geochemistry and mineral chemical behavior of hydrothermal alteration of the Tuwu porphyry copper deposit, Eastern Tianshan, Northwest China

文献类型：期刊论文

作者Yuan, Hongqing2,3,5,6; Shen, Ping2,3,5; Pan, Hongdi1; An, Zhi-Hai4; Ma, Ge2; Li, Wenguang2,3,5
刊名GEOLOGICAL JOURNAL
出版日期2020
卷号55期号:1页码:786-805
关键词Eastern Tianshan fluid composition geochemistry mineral chemistry Tuwu porphyry copper deposit
ISSN号0072-1050
DOI10.1002/gj.3437
英文摘要The Tuwu deposit is one of the largest porphyry copper deposits in the Eastern Tianshan, Northwest China. Ore bodies of the deposit are associated with the tonalite porphyry, which intruded the Early Carboniferous Qi ' eshan Group. The hydrothermal ore-forming processes include the porphyry mineralization episode with potassic, chlorite-sericite/albite, phyllic, and propylitic alteration and the overprinting mineralization episode. These hydrothermal alteration episodes were studied on the basis of mass transfer and element mobility. The mass balance data and isocon diagrams reveal that Cu is highly associated with the chlorite-sericite (albite) stage and followed by phyllic and potassic stages. On the basis of electron probe analysis, the SO3 contents of the igneous apatite from the tonalite porphyries range from 0.016 to 0.288 wt.%, which are higher than those from the diorite porphyries (SO3 = 0.088-0.179 wt.%). Similarly, the apatite saturation temperature (861-926 degrees C) and magmatic S content (mean = 52.16 ppm) from the tonalite porphyries are also higher that from the diorite porphyries (T = 813-877 degrees C; S = 28.25 ppm). These results suggest that the S content of the apatite is related to the temperature and S content of the melt. In the hydrothermal alteration zones, the F favours partitioning into apatite under lower temperature, the F contents of hydrothermal apatite increase from the potassic zones to the propylitic zones accompanying with the decrease of temperature. Cl element is much more sensitive to the pH, pressure, and fluid composition than F element. The Cl contents of the apatite increase from the potassic zones (0.18-0.46 wt.%) to the chorite-sericite (albite) zones (0.28-0.58 wt.%), resulting from the decrease of fluid pH and pressure. The lower Cl contents of apatite (0.07-0.48 wt.%) in the phyllic zones were due to the lower Cl content of hydrothermal fluids. The highest Cl contents (0.09-0.69 wt.%) of apatite in the propylitic zones were caused by the decrease of pressure. The delta O-18(water) values of quartz in chlorite-sericite (albite) zones and phyllic zones range from -0.8 parts per thousand to -0.4 parts per thousand and from -5.3 parts per thousand to 4.8 parts per thousand, and the delta D values vary from -57 parts per thousand to -47 parts per thousand and from -52 parts per thousand to -44 parts per thousand, respectively. Gaseous compositions of the fluid inclusions in quartz are dominated by H2O with minor CO2, and the liquid compositions mainly consist of Na+ and Cl-. These data imply that the ore-forming fluids belong to the H2O-NaCl system and evolved from magmatic water to meteoric water in origin.
WOS关键词CU DEPOSIT ; NW CHINA ; FLUID INCLUSIONS ; MAGMATIC APATITE ; HOST PORPHYRIES ; TRACE-ELEMENTS ; SIERRA-NEVADA ; MASS-TRANSFER ; ISOTOPE ; SULFUR
资助项目National Natural Science Foundation of China[41772089] ; National Natural Science Foundation of China[U1303293] ; National Key R&D Program of China[2017YFC0601206] ; National Key R&D Program of China[2018YFC0604004]
WOS研究方向Geology
语种英语
WOS记录号WOS:000508025400046
出版者WILEY
资助机构National Natural Science Foundation of China ; National Natural Science Foundation 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 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 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 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 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 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 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 Key R&D Program of China ; National Key R&D Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95902]  
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.Changan Univ, Coll Earth Sci, Xian, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng XiLu, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
4.Yanxin Copper Co LTD, Hami, Xinjiang, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Laurentian Univ, Harquail Sch Earth Sci, Sudbury, ON, Canada
推荐引用方式
GB/T 7714		 Yuan, Hongqing,Shen, Ping,Pan, Hongdi,et al. Geochemistry and mineral chemical behavior of hydrothermal alteration of the Tuwu porphyry copper deposit, Eastern Tianshan, Northwest China[J]. GEOLOGICAL JOURNAL,2020,55(1):786-805.
APA Yuan, Hongqing,Shen, Ping,Pan, Hongdi,An, Zhi-Hai,Ma, Ge,&Li, Wenguang.(2020).Geochemistry and mineral chemical behavior of hydrothermal alteration of the Tuwu porphyry copper deposit, Eastern Tianshan, Northwest China.GEOLOGICAL JOURNAL,55(1),786-805.
MLA Yuan, Hongqing,et al."Geochemistry and mineral chemical behavior of hydrothermal alteration of the Tuwu porphyry copper deposit, Eastern Tianshan, Northwest China".GEOLOGICAL JOURNAL 55.1(2020):786-805.

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来源：地质与地球物理研究所

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