Triggers for the formation of porphyry ore deposits in magmatic arcs
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TLDR
A review of the main processes that trigger porphyry ore formation suggests that sulphide saturation of the magmas that supply the metals could be the overriding mechanism that helps control the temporal and spatial distribution of the ore deposits.Abstract:
Porphyry ore deposits supply much of the copper, molybdenum, gold and silver used by humans. A review of the main processes that trigger porphyry ore formation suggests that sulphide saturation of the magmas that supply the metals could be the overriding mechanism that helps control the temporal and spatial distribution of the ore deposits.read more
Citations
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Porphyry deposits and oxidized magmas
Weidong Sun,Ruifang Huang,He Li,Yongbin Hu,Chan-chan Zhang,Sai-Jun Sun,Lipeng Zhang,Xing Ding,Congying Li,Robert E. Zartman,Ming-Xing Ling +10 more
TL;DR: Porphyry deposits supply most of the world's Cu and Mo resources Over 90% of the porphyry mines are found at convergent margins, especially above active subduction zones, with much fewer occurrences at postcollisional or other tectonic settings Porphyry Cu-(Mo)−(Au) deposits are essentially magmatic-hydrothermal systems, which are generally initiated by injection of oxidized magmas saturated with metal-rich aqueous fluids, i.e., the parental magmas need to be water rich and oxidized with most
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The oxidation state, and sulfur and Cu contents of arc magmas: implications for metallogeny
TL;DR: A review of the literature suggests that the elevated oxidation state in the asthenospheric mantle wedge source of arc magmas (ΔFMQ ≤ ǫ+1/ǫ±1) derives from the subduction of seawater-altered and oxidized oceanic crust and is transmitted into the mantle wedge via prograde metamorphic dehydration fluids carrying sulfate and other oxidizing components.
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Increasing Magmatic Oxidation State from Paleocene to Miocene in the Eastern Gangdese Belt, Tibet: Implication for Collision-Related Porphyry Cu-Mo +/- Au Mineralization
TL;DR: In this paper, the authors show that the later Oligo-Miocene-Eocene magmas were also more oxidized than the earlier Oligocene-Paleogene-Eogene magmas and that the amphibole results were systematically shifted to higher ΔFMQ compared to data from magnetite-ilmenite pairs.
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Oxygen fugacity and porphyry mineralization: A zircon perspective of Dexing porphyry Cu deposit, China
TL;DR: In this article, the authors determined trace element compositions and U-Pb ages of inherited zircon from Dexing porphyry Cu deposit, calculated Ce4+/Ce3+ of zircons and estimated the oxygen fugacity of their parental magmas.
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Generation of porphyry copper deposits by gas–brine reaction in volcanic arcs
TL;DR: The authors acknowledge research funding from BHP Billiton, a Benjamin Meaker Visiting Professorship to J.M.B., and a Royal Society Wolfson Research Merit Award and ERC======Advanced Grant (CRITMAG) to JMB.
References
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Book
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TL;DR: In this article, the authors define Orogenic Andesite and discuss its properties and properties, including the following: 1.1 Topography, gravity, heat flow, and conductivity.
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TL;DR: In this paper, the mass assimilation rate is an arbitrary fraction(r) of the fractional crystallization rate, where r < 1 is a combination of zone refining and fractional scaling.
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TL;DR: In this paper, Skinner et al. discuss the relationship between hydrous alteration and its relationship to hydrous fluid composition in the formation of sulfide-sulfide ores.
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Porphyry Copper Systems
TL;DR: Porphyry Cu systems are the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high and intermediate-sulfidation epithermal deposits as mentioned in this paper.
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Crustal contributions to arc magmatism in the Andes of Central Chile
Wes Hildreth,Stephen Moorbath +1 more
TL;DR: In this article, 15 andesite-dacite stratovolcanoes on the volcanic front of a single segment of the Andean arc show along-arc changes in isotopic and elemental ratios that demonstrate large crustal contributions to magma genesis.