Determination of fluid/melt partition coefficients by LA-ICPMS analysis of co-existing fluid and silicate melt inclusions: Controls on element partitioning

Zajacz, Zoltán; Halter, Werner E.; Pettke, Thomas; Guillong, Marcel

doi:10.1016/j.gca.2008.01.034

Cited by 425 publications

(212 citation statements)

References 86 publications

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“…36 Haplogranite melt composition, aqueous fluid with HCl and HF, 2 kbar, 750 C. 37 1-10 GPa, 1750-2100 °C, 0-28 wt% S, and fO 2 2 log units below IW (core conditions). 38 Granitic and peralkaline melts, melts with high chlorinities (1-14 mole/kg), log fO 2 = NNO−1.7 to NNO+4. 40 Haplogranite melt composition, aqueous fluid with HCl and HF, 2 kbar, 750 C. 41 The silicate constituent was either a MORB or a composition close to the 1.5 GPa eutectic composition in the system anorthite-diopside-forsterite (An 50 Di 28 Fo 22 ).…”

Section: Metal Partition Coefficientsmentioning

confidence: 99%

A distinct metal fingerprint in arc volcanic emissions

2018

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Section: Metal Partition Coefficientsmentioning

confidence: 99%

A distinct metal fingerprint in arc volcanic emissions

2018

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“…8). Importantly, Cu has the stronger affinity to partition into an exsolving magmatic volatile phase as shown by volatile-silicate melt partition coefficients between 10 and 100 (Candela and Holland 1984;Zajacz et al 2008;Guo and Audétat 2017). In contrast, the volatile-silicate melt partition coefficients for Mo is between 0.1 and 4 (Candela and Holland 1984;Guo and Audétat 2017).…”

Section: Evidence For Cu Degassing In the Brothers Magmatic Systemmentioning

confidence: 99%

Constraints on the source of Cu in a submarine magmatic-hydrothermal system, Brothers volcano, Kermadec island arc

Keith

Haase

Klemd

et al. 2018

Contrib Mineral Petrol

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Most magmatic-hydrothermal Cu deposits are genetically linked to arc magmas. However, most continental or oceanic arc magmas are barren, and hence new methods have to be developed to distinguish between barren and mineralised arc systems. Source composition, melting conditions, the timing of S saturation and an initial chalcophile element-enrichment represent important parameters that control the potential of a subduction setting to host an economically valuable deposit. Brothers volcano in the Kermadec island arc is one of the best-studied examples of arc-related submarine magmatic-hydrothermal activity. This study, for the first time, compares the chemical and mineralogical composition of the Brothers seafloor massive sulphides and the associated dacitic to rhyolitic lavas that host the hydrothermal system. Incompatible trace element ratios, such as La/Sm and Ce/Pb, indicate that the basaltic melts from L'Esperance volcano may represent a parental analogue to the more evolved Brothers lavas. Copper-rich magmatic sulphides (Cu > 2 wt%) identified in fresh volcanic glass and phenocryst phases, such as clinopyroxene, plagioclase and Fe-Ti oxide suggest that the surrounding lavas that host the Brothers hydrothermal system represent a potential Cu source for the sulphide ores at the seafloor. Thermodynamic calculations reveal that the Brothers melts reached volatile saturation during their evolution. Melt inclusion data and the occurrence of sulphides along vesicle margins indicate that an exsolving volatile phase extracted Cu from the silicate melt and probably contributed it to the overlying hydrothermal system. Hence, the formation of the Cu-rich seafloor massive sulphides (up to 35.6 wt%) is probably due to the contribution of Cu from a bimodal source including wall rock leaching and magmatic degassing, in a mineralisation style that is hybrid between Cyprus-type volcanic-hosted massive sulphide and subaerial epithermal-porphyry deposits.

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“…1), the majority of samples in this study (with the exception of a few ultrapotassic samples in the Bingham district; Maughan et al, 2002), including limited data for Miocene ultrapotassic rocks of the EPRIM (Kay et al, 1994;Redwood and Rice, 1997;Sandeman and Clark, 2004;Maria and Luhe, 2008;Gómez-Tuena et al, 2011) and southern Tibet (Miller et al, 1999;Ding et al, 2003Ding et al, , 2006Williams et al, 2004;Gao et al, 2007b;Zhao et al, 2009;Chen et al, 2012), do not contain high concentrations of Cu (<130 ppm). However, these mantle-derived potassic and ultrapotassic magmas are typically enriched in the LILE, LREE, and volatiles such as H 2 O, CO 2 , F, and Cl (e.g., Rock, 1987;Rock et al, 1990;Behrens et al, 2009), all of which likely enhance the solubility of chalcophile elements, such as Cu and Au, in high-temperature aqueous fluids (e.g., Heinrich et al, 1992;Pokrovski et al, 2005Pokrovski et al, , 2008Simon et al, 2005Simon et al, , 2006Zajacz et al, 2008Zajacz et al, , 2011Seo et al, 2009). This indicates that the generally high K 2 O concentrations (K 2 O/Na 2 O > 0.5) in magmas associated with porphyry Cu mineralization are most likely produced by mixing between melts derived from the underplated basaltic lower crust and ascending mantle-derived potassic and ultrapotassic magmas (e.g., Pettke et al, 2010;Yang et al, 2014).…”

Section: Accepted M Manuscriptmentioning

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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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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Determination of fluid/melt partition coefficients by LA-ICPMS analysis of co-existing fluid and silicate melt inclusions: Controls on element partitioning

Cited by 425 publications

References 86 publications

A distinct metal fingerprint in arc volcanic emissions

A distinct metal fingerprint in arc volcanic emissions

Constraints on the source of Cu in a submarine magmatic-hydrothermal system, Brothers volcano, Kermadec island arc

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

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