Vapor-phases as Cu transport agents for the shear-zone-hosted mineralization system: A perspective from H-O-S-Cu isotopes
Abstract Elucidating metal transport agents is the key to understanding the genesis of deposits and tracking the locations of concealed orebodies. Here, we integrate H-O-S-Cu isotopic data from the shear-zone-hosted Lingyun Cu deposit, China, as a means to fingerprint metal transport agents. Sulfide mineralization can be divided into early and late stages, which consist of chalcopyrite + bornite + quartz veins and chalcopyrite + bornite + ankerite veinlets, respectively. Both $ δ^{18} $$ O_{fluid} $ and δD values of fluid inclusions hosted by quartz ($ δ^{18} $$ O_{fluid} $: 0.5‰ to 9.9‰, δD: –103.9‰ to –60.1‰) and $ δ^{65} $Cu values of sulfides (–1.85‰ to +0.39‰) from the early stage progressively decrease from the southeastern to northwestern portions of the Lingyun deposit, whereas sulfide $ δ^{34} $S simultaneously shifts toward heavier values (–14.4‰ to 5.0‰). The $ δ^{34} $S and $ δ^{65} $Cu values of sulfides from the late stage have restricted ranges from –11.2‰ to –9.3‰ and –0.30‰ to 0.05‰, respectively. The possibilities of meteoric water addition, water-rock interaction, inter-mineral Cu partitioning, diffusion, and oxidation could be ruled out as reasons for having caused systematic H-O-S-Cu isotope variations. Vapor-liquid separation resulted in preferential incorporation of light Cu, H, and O isotopes into the vapor phase. The decrease in oxygen fugacity in the fluids resulted in a shift toward heavier $ δ^{34} $S values as fluid flowed outward. Vapor-phases are the dominant transport agents for Cu in the Lingyun deposit, which may be widely applicable to shear-zone-hosted deposits. The direction of progressively increasing $ δ^{65} $Cu, δD, and $ δ^{18} $O values and decreasing $ δ^{34} $S values allows identification of potential locations of concealed orebodies..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:109 |
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| Enthalten in: |
American mineralogist - 109(2024), 4 vom: 27. März, Seite 667-681 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhao, Yun [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| BKL: |
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| Anmerkungen: |
© 2024 by Mineralogical Society of America |
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| doi: |
10.2138/am-2022-8888 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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GRUY009487689 |
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| 520 | |a Abstract Elucidating metal transport agents is the key to understanding the genesis of deposits and tracking the locations of concealed orebodies. Here, we integrate H-O-S-Cu isotopic data from the shear-zone-hosted Lingyun Cu deposit, China, as a means to fingerprint metal transport agents. Sulfide mineralization can be divided into early and late stages, which consist of chalcopyrite + bornite + quartz veins and chalcopyrite + bornite + ankerite veinlets, respectively. Both $ δ^{18} $$ O_{fluid} $ and δD values of fluid inclusions hosted by quartz ($ δ^{18} $$ O_{fluid} $: 0.5‰ to 9.9‰, δD: –103.9‰ to –60.1‰) and $ δ^{65} $Cu values of sulfides (–1.85‰ to +0.39‰) from the early stage progressively decrease from the southeastern to northwestern portions of the Lingyun deposit, whereas sulfide $ δ^{34} $S simultaneously shifts toward heavier values (–14.4‰ to 5.0‰). The $ δ^{34} $S and $ δ^{65} $Cu values of sulfides from the late stage have restricted ranges from –11.2‰ to –9.3‰ and –0.30‰ to 0.05‰, respectively. The possibilities of meteoric water addition, water-rock interaction, inter-mineral Cu partitioning, diffusion, and oxidation could be ruled out as reasons for having caused systematic H-O-S-Cu isotope variations. Vapor-liquid separation resulted in preferential incorporation of light Cu, H, and O isotopes into the vapor phase. The decrease in oxygen fugacity in the fluids resulted in a shift toward heavier $ δ^{34} $S values as fluid flowed outward. Vapor-phases are the dominant transport agents for Cu in the Lingyun deposit, which may be widely applicable to shear-zone-hosted deposits. The direction of progressively increasing $ δ^{65} $Cu, δD, and $ δ^{18} $O values and decreasing $ δ^{34} $S values allows identification of potential locations of concealed orebodies. | ||
| 700 | 1 | |a Xue, Chunji |4 aut | |
| 700 | 1 | |a Liu, Sheng-Ao |4 aut | |
| 700 | 1 | |a Mathur, Ryan |4 aut | |
| 700 | 1 | |a Zhao, Xiaobo |4 aut | |
| 700 | 1 | |a Seltmann, Reimar |4 aut | |
| 700 | 1 | |a Jiao, Jiangang |4 aut | |
| 700 | 1 | |a Huang, Yongsen |4 aut | |
| 700 | 1 | |a Wang, Xuefeng |4 aut | |
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