Porphyry deposits and oxidized magmas

Sun, Weidong; Huang, Ruifang; He, Li; Hu, Yongbin; Zhang, Chan-chan; Sun, Shengsi; Zhang, Lipeng; Ding, Xing; Li, Congying; Zartman, Robert E.; Ling, Ming‐Xing

doi:10.1016/j.oregeorev.2014.09.004

Cited by 436 publications

(150 citation statements)

References 225 publications

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“…Porphyry Cu (Au) deposits are one of the most important economic mineral associations (Cooke et al, 2005;Sillitoe, 2010;Sun et al, 2013Sun et al, , 2015, mostly distributed along convergent margins, such as the circum-Pacific belt and the Tethys belt (Cooke et al, 2005;Qu et al, 2001;Sillitoe, 1997;Sun et al, 2010Sun et al, , 2011Sun et al, , 2012b. Considering that porphyry Cu deposits are usually closely associated with adakites (Ling et al, 2009(Ling et al, , 2013bOyarzun et al, 2001;Sun et al, 2011Sun et al, , 2013, it is very important to study the origin and relationship of adakites with the Gangdese porphyry copper deposits.…”

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confidence: 99%

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

Liu

Ling

et al. 2015

Lithos

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confidence: 99%

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

Liu

Ling

et al. 2015

Lithos

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“…Oxygen fugacity is an important factor for porphyry copper deposits (Mungall 2002;Sillitoe 2010;Sun et al 2013bSun et al , 2015a. Zircon is a good recorder of magmatic oxygen fugacity (Ballard et al 2002) (Ballard et al 2002;Liang et al 2006).…”

Section: Oxygen Fugacity Of Magmamentioning

confidence: 99%

“…Magmas of porphyry or skarn copper deposits generally have high oxygen fugacity, usually more than two orders of magnitude higher than the fayalite-magnetite-quartz (DFMQ ? 2) oxygen buffer (Mungall 2002), but lower than the hematite- magnetite oxygen buffer (Sun et al 2013b(Sun et al , 2015a. Oxygen fugacity strongly affects the sulfur species in magmas and their solubility.…”

Section: Oxygen Fugacity Of Magmamentioning

confidence: 99%

“…Copper is incompatible in sulfur-undersaturated magmas; when initial concentration of copper is high in oxidized magmas (Sun et al 2013b(Sun et al , 2015a, conditions are favorable for copper mineralization. The oxygen fugacity in convergent-margin magmas is usually higher than in other geologic settings (e.g., intraplate setting), which is related to plate subduction and release of oxidized fluids (Brandon and Draper 1996;Parkinson and Arculus 1999;Sun et al 2007aSun et al , b, 2010a.…”

Section: Oxygen Fugacity Of Magmamentioning

confidence: 99%

“…Porphyry or skarn copper deposits are the most important deposit types, accounting for *70%-80% of the world's total copper reserves (Sillitoe 2010;Sun et al 2015a), and mainly form along convergent belts; for example: the Andean region in South America. Copper deposits in the northeast part of the South China Block have been well-studied.…”

Section: Introductionmentioning

confidence: 99%

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Adakitic rocks associated with the Shilu copper–molybdenum deposit in the Yangchun Basin, South China, and their tectonic implications

Zhang

Liang

et al. 2017

Acta Geochim

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The competing effects of sulfide saturation versus degassing on the behavior of the chalcophile elements during the differentiation of hydrous melts

Jenner

Hauri

Bullock

et al. 2015

Geochem Geophys Geosyst

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There is a lack of consensus regarding the roles of sulfide saturation versus volatile degassing on the partitioning of Cu and Ag during differentiation and eruption of convergent margin magmas. Because of their oxidized character, volatile-rich magmas from the Eastern Manus Back-arc Basin (EMBB) only reach sulfide saturation following magnetite-driven reduction of the melt: the so-called ''magnetite crisis.'' If sulfide saturation typically precedes volatile saturation, the magnetite crisis will limit the proportion of Cu and Ag that can partition from the melt into an exsolving volatile-rich phase, which may contribute to the sporadic occurrence of magmatic-hydrothermal ore deposits at convergent margins. However, it is unclear whether the magnetite crisis is a common or rare event during differentiation of volatile-rich magmas. We report major and trace element data for submarine volcanic glasses from the Tonga arc-proximal Valu Fa Ridge (VFR; SW Pacific). Cu-Se-Ag systematics of samples erupting at the southern VFR suggest magnetite fractionation-triggered sulfide saturation. The similarity in chalcophile element systematics of the southern VFR and EMBB samples is unlikely to be coincidental, and may indicate that the magnetite crisis is a common event during differentiation of hydrous melts. However, unlike many convergent margin magmas, it is unlikely that the evolving VFR and EMBB were saturated in a S-bearing volatile phase prior to magnetite fractionation. Hence, the metal-depleting magnetite crisis may be restricted to back-arc basin magmas that do not degas volatiles prior to magnetite fractionation and potentially convergent margin magmas fractionating at high pressures in the continental crust.

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Porphyry deposits and oxidized magmas

Cited by 436 publications

References 225 publications

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

Adakitic rocks associated with the Shilu copper–molybdenum deposit in the Yangchun Basin, South China, and their tectonic implications

The competing effects of sulfide saturation versus degassing on the behavior of the chalcophile elements during the differentiation of hydrous melts

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