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Geochemistry and mineral chemical behavior of hydrothermal alteration of the Tuwu porphyry copper deposit, Eastern Tianshan, Northwest China
Yuan, Hongqing1,2,3,4; Shen, Ping1,2,3; Pan, Hongdi5; An, Zhi-Hai6; Ma, Ge1; Li, Wenguang1,2,3
2020
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume55Issue:1Pages:786-805
AbstractThe 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.
KeywordEastern Tianshan fluid composition geochemistry mineral chemistry Tuwu porphyry copper deposit
DOI10.1002/gj.3437
Funding OrganizationNational 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
WOS KeywordCU DEPOSIT ; NW CHINA ; FLUID INCLUSIONS ; MAGMATIC APATITE ; HOST PORPHYRIES ; TRACE-ELEMENTS ; SIERRA-NEVADA ; MASS-TRANSFER ; ISOTOPE ; SULFUR
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000508025400046
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95902
Collection矿产资源研究院重点实验室
Corresponding AuthorShen, Ping
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng XiLu, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Laurentian Univ, Harquail Sch Earth Sci, Sudbury, ON, Canada
5.Changan Univ, Coll Earth Sci, Xian, Peoples R China
6.Yanxin Copper Co LTD, Hami, Xinjiang, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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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