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Multiple mineralization events of the Paleozoic Tuwu porphyry copper deposit, Eastern Tianshan: evidence from geology, fluid inclusions, sulfur isotopes, and geochronology

Wang, Y, Chen, H, Baker, MJ ORCID: 0000-0002-8050-7631, Han, J, Xiao, B, Yang, J and Jourdan, F 2019 , 'Multiple mineralization events of the Paleozoic Tuwu porphyry copper deposit, Eastern Tianshan: evidence from geology, fluid inclusions, sulfur isotopes, and geochronology' , Mineralium Deposita, vol. 54, no. 7 , pp. 1053-1076 , doi: https://doi.org/10.1007/s00126-018-0859-4.

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Abstract

The Tuwu porphyry Cu deposit, located in Eastern Tianshan, NW China, is hosted by a plagiogranite porphyry and Carboniferous Qieshan Group volcanic rocks. Based on crosscutting relationships and mineral assemblages, hydrothermal alteration and mineralization processes at Tuwu can be divided into four stages: early propylitic alteration (stage I), porphyry mineralization (stage II), overprinting mineralization (stage III), and post-mineralization (stage IV). The porphyry mineralization stage (stage II) contributed to the majority of the CuMo resource, with Cu mineralization occurring mainly as quartz-chalcopyrite veins. Stage III also produced minor Cu mineralization, characterized by chalcopyriteanhydritechloritecalcite assemblages. Fluid inclusion (FI) study reveals that stage II is characterized by a high-temperature, high-salinity, highly oxidized, and K-rich H2ONaClCaCl2 fluid. Fluid boiling and mixing likely occurred during the porphyry mineralization stage, leading to the precipitation of chalcopyrite and pyrite. Alteration and mineralization in stage III were derived from a S-rich H2ONaClCaCl fluid, with fluid boiling leading to the precipitation of chalcopyrite. The δ34S values of chalcopyrite from stages II and III are − 0.80.6 and 1.11.3 , respectively, suggesting magmatic sources for the ore-forming components of both stages. 40Ar/39Ar dating indicates that stage II likely occurred at 328.1 ± 1.4 Ma, around the age emplacement of the causative plagiogranite porphyry (ca. 337.7330.3 Ma). We suggest the overprinting mineralization event occurred at ca. 323 Ma, spatially and genetically related to the emplacement of the quartz albite porphyry at 323.6 ± 2.5 Ma.

Item Type: Article
Authors/Creators:Wang, Y and Chen, H and Baker, MJ and Han, J and Xiao, B and Yang, J and Jourdan, F
Keywords: Tuwu porphyry Cu deposit, Eastern Tianshan, overprinting mineralization, fluid inclusions, S isotope, ArAr dating, copper, porphyry
Journal or Publication Title: Mineralium Deposita
Publisher: Springer-Verlag
ISSN: 0026-4598
DOI / ID Number: https://doi.org/10.1007/s00126-018-0859-4
Copyright Information:

Copyright 2018 Springer-Verlag GmbH Germany

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