High Sr/Y Magmas Reflect Arc Maturity, High Magmatic Water Content, and Porphyry Cu ± Mo ± Au Potential: Examples from the Tethyan Arcs of Central and Eastern Iran and Western Pakistan

Richards, Jeremy P.; Spell, Terry L.; Rameh, Esmaeil; Razique, Abdul; Fletcher, Tim D.

doi:10.2113/econgeo.107.2.295

Cited by 405 publications

(162 citation statements)

References 92 publications

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“…The Cenozoic Sungun-Dalli-Sar cheshmeh porphyry Cu belt mainly occurred during Miocene times (e.g., Shafiei et al, 2009;Haschke et al, 2010;Richards et al, 2012;Ayati et al, 2013;Asadi et al, 2014;Richards, 2014).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…1a; e.g., Mitchell and Garson, 1972;Jorhan et al, 1983;Bektas et al, 1990;Solomon, 1990;Rui et al, 2004). More recent discoveries have highlighted the occurrence and formation of porphyry Cu (-Mo-Au) deposits in continent-continent collisional settings, such as in southern Tibet, Iran, and western Pakistan (e.g., Rui et al, 1984;Hou et al, 2001Hou et al, , 2003Hou et al, , 2004Hou et al, , 2011Qu et al, 2001;Richards, 2009Richards, , 2011aShafiei et al, 2009;Pettke et al, 2010;Richards et al, 2012;Ayati et al, 2013;Asadi et al, 2014;Fig. 1a, b).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical differences between subduction- and collision-related copper-bearing porphyries and implications for metallogenesis

Chen

Wang

et al. 2015

Ore Geology Reviews

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Porphyry Cu (-Mo-Au) deposits occur not only in continental margin-arc settings (subduction-related porphyry Cu deposits, such as those along the eastern Pacific Rim (EPRIM)), but also in continent-continent collisional orogenic belts (collision-related porphyry Cu deposits, such as those in southern Tibet). These Cu-mineralized porphyries, which develop in contrasting tectonic settings, are characterized by some different trace element (e.g., Th, and Y) concentrations and their ratios (e.g., Sr/Y, and La/Yb), suggesting that their source magmas probably developed by different processes. Subduction-related porphyry Cu mineralization on the EPRIM is associated with intermediate to felsic calc-alkaline magmas derived from primitive basaltic magmas that pooled beneath the lower crust and underwent melting, assimilation, storage, and homogenization (MASH), whereas K-enriched collision-related porphyry Cu mineralization was associated with underplating of subduction-modified basaltic materials beneath the lower crust (with subsequent transformation into amphibolites and eclogite amphibolites), and resulted from partial melting of the newly formed thickened lower crust. These different processes led to the collision-related porphyry Cu deposits associated with adakitic magmas enriched by the addition of melts, and the subduction-related porphyry Cu deposits associated with magmas comprising all compositions between normal arc rocks and adakitic rocks, all of which were associated with fluid-dominated enrichment process.In subduction-related Cu porphyry magmas, the oxidation state (fO 2 ), the concentrations of chalcophile metals, and other volatiles (e.g., S and Cl), and the abundance of water were directly controlled by the composition of the primary arc basaltic magma. In contrast, the high Cu concentrations and fO 2 values of collision-related Cu porphyry magmas were indirectly derived from subduction modified magmas, and the large amount of water and other volatiles in these magmas were controlled in part by partial melting of amphibolite derived from arc basalts that were underplated beneath the lower crust, and in part by the contribution from the rising potassic and ultrapotassic magmas. Both subduction-and collision-related porphyries are enriched in potassium, and were associated with crustal thickening. Their high K 2 O contents were primarily as a result of the inheritance of enriched mantle components and/or mixing with contemporaneous ultrapotassic magmas.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical differences between subduction- and collision-related copper-bearing porphyries and implications for metallogenesis

Chen

Wang

et al. 2015

Ore Geology Reviews

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“…Malekzadeh (2009) Chah-Shaljami porphyritic granitoids were dated by Arjmandzadeh et al (2011), using the Rb-Sr isotopic systematics of minerals and whole rock, at 33.5 ± 1 Ma. Richards et al (2012) obtained an identical age (33.72 ± 0.08 Ma), within error, using the 40 Ar/ 39 Ar method in a sample from a quartz monzonite intrusion from the same area. The Chah-Shaljami rocks constitute a suite with high-K calc-alkaline features, although some trace element characteristics reveal an adakitic affinity.…”

Section: Discussionmentioning

confidence: 64%

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

Arjmandzadeh

Santos

2013

Int J Earth Sci (Geol Rundsch)

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The Dehsalm Cu-Mo-bearing porphyritic granitoids belong to the Lut Block volcanic-plutonic belt (central eastern Iran). These rocks range in composition from gabbro-diorite to granite, with dominance of monzonites and quartz monzonites, and have geochemical features of high-K calc-alkaline to shoshonitic volcanic arc suites. Primitive mantle-normalized trace element spider diagrams display strong enrichment in large-ion lithophile elements such as Rb, Ba and Cs and depletions in some high-field strength elements, e.g., Nb, Ti, Y and HREE. Chondrite-normalized plots display significant LREE enrichments, high La N /Yb N and a lack of Eu anomaly. High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb-Sr whole rock-feldspar-biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geochronological result in Chah-Shaljami granitoids, further northwest within the Lut Block. ( 87 Sr/ 86 Sr) i and eNd i isotopic ratios range from 0.70481 to 0.70508 and from

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“…12). Additionally, the suppression of early plagioclase crystallization and the promotion of amphibole crystallization can generate high whole-rock Sr/Y ratios (Richards et al, 2012), high whole-rock La/Yb ratios (Castillo et al, 1999;Richards and Kerrich, 2007;Tiepolo et al, 2011) and the adakitic geochemical signatures reported for the PDL igneous rocks by previous research (e.g., Leng et al, 2007;Ren et al, 2011).…”

Section: Zircon Oxygen Isotope and Te Systematics: Implications For Cmentioning

confidence: 84%

“…In particular, these patterns are depleted in the MREE (Fig. 13), probably suggesting that these melts have crystallized amphibole, the mineral that preferentially partitions the MREE (Rooney et al, 2011;Richards et al, 2012), before forming the PDL zircons. The MREEdepleted patterns in whole-rock normalized REE diagrams also agree with the fractional crystallization of amphibole (Fig.…”

Section: Zircon Oxygen Isotope and Te Systematics: Implications For Cmentioning

confidence: 99%

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

Kong

Chen

2016

Chemical Geology

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High Sr/Y Magmas Reflect Arc Maturity, High Magmatic Water Content, and Porphyry Cu ± Mo ± Au Potential: Examples from the Tethyan Arcs of Central and Eastern Iran and Western Pakistan

Cited by 405 publications

References 92 publications

Geochemical differences between subduction- and collision-related copper-bearing porphyries and implications for metallogenesis

Geochemical differences between subduction- and collision-related copper-bearing porphyries and implications for metallogenesis

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

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