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• W2789333046 endingPage "662" @default.
• W2789333046 startingPage "649" @default.
• W2789333046 abstract "Ore-forming fluid exsolution in a shallow magma chamber is a critical step in the formation of porphyry Cu ± Mo ± Au deposits but one for which direct evidence is rarely found. Here, Cl abundance, major-trace element content and H isotope analysis of amphibole in diorite and barren granodiorite porphyry samples from the Duolong porphyry-epithermal Cu-Au district are presented in order to reveal processes associated with fluid exsolution and magma evolution. Low-Al Mg-hornblende formed in ore-bearing diorite at ∼750–860 °C and ∼80–200 MPa. On primitive mantle-normalized diagrams, these low-Al amphibole grains have slightly convex upward REE patterns with distinctly negative Eu anomalies and negative anomalies in Pb, Sr, Eu, Zr, Hf, and Ti anomalies, suggesting crystallization from the same arc magma after plagioclase and magnetite crystallization. A large variation in estimated melt H2O (∼6 to 3 wt%) and Cl content (0.09–0.38 wt%), as well as low δD values (−103 to −113‰) indicate that the magma underwent large-scale fluid exsolution, contributing to the formation of Duolong Cu-Au mineralization. Additionally, amphibole from a barren granodiorite porphyry shows two distinct populations, distinguished by their Al content. This intrusion has low-Al amphibole (Mg-hornblende) which formed at similar conditions to low-Al amphiboles in the diorite (∼790–870 °C and ∼100–230 MPa), whereas high-Al amphibole (tschermakite) formed at ∼880–970 °C and ∼210–400 MPa. Some high-Al amphibole phenocrysts have slightly convex REE patterns with no negative Eu anomalies, a depletion in Nb, Zr, and Hf, and positive Sr, Ba, and Pb anomalies, likely consistent with amphibole crystallization from more mafic basaltic-andesitic melts. Low-Al amphibole in the granodiorite porphyry shows different compositional trends compared to those in the diorite, suggesting that they crystallized from different magmas. Considering the evidence for mafic magma replenishment suggested by the positive correlation between AlIV and Mg# values in high-Al amphibole, the low-Al amphibole in the barren granodiorite porphyry likely crystallized from a new hybrid magma with mafic to intermediate-felsic magma compositions. Meanwhile, smaller variations in Cl content (0.08–0.24 wt%) in low-Al amphibole was dominantly controlled by magma evolution (shown by variable Mg#) rather than fluid exsolution. Thus, the low δD values (−102 to −122‰) were likely inherited from evolved dioritic magmas that underwent fluid exsolution. Importantly, the Cl compositional variation of amphibole has a potential application as a powerful tool to identify ore-bearing and barren intrusions within porphyry Cu ± Mo ± Au deposits." @default.
• W2789333046 created "2018-03-29" @default.
• W2789333046 creator A5017759300 @default.
• W2789333046 creator A5022640967 @default.
• W2789333046 creator A5029858738 @default.
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• W2789333046 creator A5081472876 @default.
• W2789333046 creator A5083508445 @default.
• W2789333046 creator A5083847024 @default.
• W2789333046 date "2018-04-01" @default.
• W2789333046 modified "2023-10-12" @default.
• W2789333046 title "Volatile variations in magmas related to porphyry Cu-Au deposits: Insights from amphibole geochemistry, Duolong district, central Tibet" @default.
• W2789333046 cites W1064157222 @default.
• W2789333046 cites W1194866897 @default.
• W2789333046 cites W1492000624 @default.
• W2789333046 cites W1529815382 @default.
• W2789333046 cites W1539519935 @default.
• W2789333046 cites W1541336545 @default.
• W2789333046 cites W1564307735 @default.
• W2789333046 cites W1915808768 @default.
• W2789333046 cites W1964778571 @default.
• W2789333046 cites W1965292304 @default.
• W2789333046 cites W1970363584 @default.
• W2789333046 cites W1976348616 @default.
• W2789333046 cites W1979634508 @default.
• W2789333046 cites W1989302906 @default.
• W2789333046 cites W1991589759 @default.
• W2789333046 cites W2002132035 @default.
• W2789333046 cites W2003785447 @default.
• W2789333046 cites W2004780129 @default.
• W2789333046 cites W2006434547 @default.
• W2789333046 cites W2009280724 @default.
• W2789333046 cites W2009958649 @default.
• W2789333046 cites W2019748000 @default.
• W2789333046 cites W2023320566 @default.
• W2789333046 cites W2024418086 @default.
• W2789333046 cites W2026295157 @default.
• W2789333046 cites W2027541945 @default.
• W2789333046 cites W2028917031 @default.
• W2789333046 cites W2030023077 @default.
• W2789333046 cites W2032663604 @default.
• W2789333046 cites W2033048387 @default.
• W2789333046 cites W2035185474 @default.
• W2789333046 cites W2044159830 @default.
• W2789333046 cites W2047938785 @default.
• W2789333046 cites W2054368497 @default.
• W2789333046 cites W2057218369 @default.
• W2789333046 cites W2063013976 @default.
• W2789333046 cites W2064289896 @default.
• W2789333046 cites W2067685960 @default.
• W2789333046 cites W2068157565 @default.
• W2789333046 cites W2068668821 @default.
• W2789333046 cites W2070503199 @default.
• W2789333046 cites W2072976733 @default.
• W2789333046 cites W2075701080 @default.
• W2789333046 cites W2082583308 @default.
• W2789333046 cites W2106129266 @default.
• W2789333046 cites W2107506859 @default.
• W2789333046 cites W2113274161 @default.
• W2789333046 cites W2115518283 @default.
• W2789333046 cites W2115785205 @default.
• W2789333046 cites W2116745296 @default.
• W2789333046 cites W2124226325 @default.
• W2789333046 cites W2126229897 @default.
• W2789333046 cites W2126466768 @default.
• W2789333046 cites W2128405318 @default.
• W2789333046 cites W2133763451 @default.
• W2789333046 cites W2136579838 @default.
• W2789333046 cites W2138522501 @default.
• W2789333046 cites W2142319362 @default.
• W2789333046 cites W2146140700 @default.
• W2789333046 cites W2151425269 @default.
• W2789333046 cites W2151685608 @default.
• W2789333046 cites W2159868744 @default.
• W2789333046 cites W2160102246 @default.
• W2789333046 cites W2162974904 @default.
• W2789333046 cites W2164870492 @default.
• W2789333046 cites W2165394332 @default.
• W2789333046 cites W2165495127 @default.
• W2789333046 cites W2286069485 @default.
• W2789333046 cites W2312756368 @default.
• W2789333046 cites W2319555640 @default.
• W2789333046 cites W2323158429 @default.
• W2789333046 cites W2334145322 @default.
• W2789333046 cites W2387329638 @default.
• W2789333046 cites W2409985158 @default.
• W2789333046 cites W2413094107 @default.
• W2789333046 cites W2468660937 @default.
• W2789333046 cites W2489149528 @default.
• W2789333046 cites W2491226624 @default.
• W2789333046 cites W2503566979 @default.
• W2789333046 cites W2509716077 @default.
• W2789333046 cites W2586637931 @default.
• W2789333046 cites W2605831567 @default.
• W2789333046 cites W2768212454 @default.
• W2789333046 cites W341179640 @default.
• W2789333046 cites W777367899 @default.
• W2789333046 cites W786077987 @default.

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