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Mineralogy and mineral geochemistry of the Tuwu porphyry Cu deposit, Eastern Tianshan, NW China: implication for the ore-forming condition and Cu mineralization
Yuan, Hongqing1,2,3,4; Shen, Ping1,2,3; Pan, Hongdi5; Liu, Yang6
2020-01-02
Source PublicationARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
Volume13Issue:2Pages:19
AbstractThe Tuwu deposit is one of the largest porphyry copper deposits in Eastern Tianshan, NW China. The widespread hydrothermal alteration is associated with porphyries and their wall-rocks in the porphyry deposit can be divided into potassic, chlorite-sericite, phyllic, and propylitic zones. In this study, we conducted a detailed study on the mineralogy of hydrothermal magnetite, mica, and epidote. Magnetite is closely related to the potassic alteration, and evolves from earlier disseminated magnetite (Mt-I) to the later magnetite-quartz +/- biotite +/- pyrite +/- bornite +/- chalcopyrite veins (Mt-II). The significant decrease in the Cr2O3 and V2O3 contents of magnetite from early to late period indicates the gradual increase of oxygen fugacity. The crystallization of magnetite supplies enough reduced sulfur that promotes the sulfide precipitation. The dominance of muscovite (Mc-I) in the early phyllic stage and the increasing of phengite muscovite (Mc-II) in the late phyllic stage suggest the evolution of hydrothermal fluid from a high-temperature and acidic environment to a low-temperature and less acidic environment. This process also results in the decrease of sulfide mineral deposition in the late phyllic stage. Epidote from propylitic zones at Tuwu has similar characteristic with the overprinting epidote in the Yandong porphyry Cu systems. Propylitic Ep-I have higher FeO content than Ep-II. The interaction of Fe-rich propylitic epidote with hydrothermal fluid enhanced both Ca2+ activity and pH value, and favored the precipitation of sulfides (e.g., chalcopyrite). In addition, the Fe-rich and less acidic fluids, which derived from the propylitic zones and flow though the sericitic rocks in the phyllic zones, also promote the deposition of Cu mineralization. Our results, combined with previous research on fluid inclusion, isotopes, and mass transfer, suggest that the changes in temperature, oxygen fugacity, and pH caused by the fluid-rock interaction played a critical role for the Cu mineralization at Tuwu.
KeywordTuwu porphyry Cu deposit Mineralogy Mineral geochemistry Physicochemical condition Mineralization
DOI10.1007/s12517-019-4982-z
Funding OrganizationNational 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 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 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 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 Keyword2-14 DRILL HOLE ; COPPER-DEPOSIT ; TRACE-ELEMENT ; HYDROTHERMAL FLUIDS ; HOST PORPHYRIES ; OXYGEN FUGACITY ; SILICATE MELTS ; AU DEPOSIT ; EPIDOTE ; MAGNETITE
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0601201]
Funding OrganizationNational 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 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 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 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:000514589800002
PublisherSPRINGER HEIDELBERG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95477
Collection矿产资源研究院重点实验室
Corresponding AuthorYuan, Hongqing
Affiliation1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Laurentian Univ, Harquail Sch Earth Sci, Sudbury, ON P3E 2C6, Canada
5.Changan Univ, Coll Earth Sci, Xian 710054, Peoples R China
6.Sinotech Minerals Explorat Co Ltd, Beijing 100012, 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. Mineralogy and mineral geochemistry of the Tuwu porphyry Cu deposit, Eastern Tianshan, NW China: implication for the ore-forming condition and Cu mineralization[J]. ARABIAN JOURNAL OF GEOSCIENCES,2020,13(2):19.
APA Yuan, Hongqing,Shen, Ping,Pan, Hongdi,&Liu, Yang.(2020).Mineralogy and mineral geochemistry of the Tuwu porphyry Cu deposit, Eastern Tianshan, NW China: implication for the ore-forming condition and Cu mineralization.ARABIAN JOURNAL OF GEOSCIENCES,13(2),19.
MLA Yuan, Hongqing,et al."Mineralogy and mineral geochemistry of the Tuwu porphyry Cu deposit, Eastern Tianshan, NW China: implication for the ore-forming condition and Cu mineralization".ARABIAN JOURNAL OF GEOSCIENCES 13.2(2020):19.
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