Chalcophile elemental compositions of MORBs from the ultraslow-spreading Southwest Indian Ridge and controls of lithospheric structure on S-saturated differentiation

Yang, Alexandra Yang; Zhou, Mei‐Fu; Zhao, Taiping; Deng, Xiaoyun; Qi, Liang; Xu, Ji‐Feng

doi:10.1016/j.chemgeo.2014.05.019

Cited by 35 publications

(35 citation statements)

References 68 publications

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“…Previous studies identified partial melting and the segregation of immiscible sulfide liquids as the key processes able to explain the fractionation of PGEs during the magmatic evolution of MORBs (e.g., Hamlyn et al, 1985;Rehkämper et al, 1999;Bézos et al, 2005;Yang et al, 2014). In particular, the highly fractionated CI-normalized HSE patterns of MORBs are generally attributed to the higher compatibility of Os, Ir and Ru in residual mantle phases, i.e., monosulfide solid solution (Mss) and/or Pt-group minerals (PGMs, e.g., Os-Ir-Ru sulfides and alloys), compared to Pt and Pd (e.g., Lorand et al, 1999Lorand et al, , 2013Luguet et al, 2003Luguet et al, , 2007Bockrath et al, 2004;Ballhaus et al, 2006;Fonseca et al, 2012;Marchesi et al, 2013;Mungall and Brenan, 2014).…”

Section: Introductionmentioning

confidence: 99%

Selenium and tellurium systematics in MORBs from the southern Mid-Atlantic Ridge (47–50°S)

Lissner

König

Luguet

et al. 2014

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Selenium and tellurium systematics in MORBs from the southern Mid-Atlantic Ridge (47–50°S)

Lissner

König

Luguet

et al. 2014

Geochimica et Cosmochimica Acta

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“…This idea appears to be supported by previous studies, which suggest that aqueous S-and Cl-bearing magmatic volatiles are the main source and transport medium for Cu in submarine hydrothermal arc systems, such as Brothers volcano (de Ronde et al 2005;Berkenbosch et al 2012;Gruen et al 2014). Therefore, economic mineralisation within an island arc can be controlled by sulphide liquid immiscibility during silicate melt evolution, which is highly sensitive to changes in pressure, temperature, oxygen fugacity (fO 2 ), the degree of fractional crystallisation and the initial Fe and S contents of the melt (Mavrogenes and O'Neill 1999;Jenner et al 2010;Yang et al 2014;Keith et al 2017). Arc magmas characteristically show higher fO 2 (up to FMQ + 2) and H 2 O contents (up to 6-8 wt%) and are enriched in incompatible trace elements and volatiles (e.g., S and Cl) compared to mid-ocean ridge magmas (Wallace 2005;Richards 2011;Kelley and Cottrell 2012;Lee et al 2012).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

“…Previous studies have shown that it is important to define the physicochemical conditions (T, p, fO 2 , H 2 O) in a fractionating magma because they control the S solubility limit in a silicate melt and therefore the behaviour of chalcophile metals and the composition of potential immiscible sulphide liquids (Distler et al 1983;Mavrogenes and O'Neill 1999;Ackermand et al 2007;Yang et al 2014).…”

Section: Thermodynamic Investigations On the Brothers Magmatic Systemsmentioning

confidence: 99%

“…The presented dataset was supplemented by previously published magmatic sulphide data from Brothers volcano (n = 128; Keith et al 2017) and from mid-ocean ridges of the Atlantic (Kanehira et al 1973;MacLean 1977;Mathez 1980;Petersen 1984;Patten et al 2012Patten et al , 2013Marchesi et al 2013), Pacific (Mathez and Yeats 1976;Foder et al 1980;Distler et al 1983;Schrader and Stow 1983;Francis 1990;Ackermand et al 2007;Patten et al 2012) and Indian Ocean (Francis 1990;Yang et al 2014). …”

Section: Electron Probe Microanalysismentioning

confidence: 99%

“…2). The S concentration at sulphide saturation in silicate melts is controlled by temperature, pressure, fO 2 , the degree of fractional crystallisation and the initial S and Fe contents of the magma (Mathez and Yeats 1976;Distler et al 1983;Mavrogenes and O'Neill 1999;Ackermand et al 2007;Yang et al 2014). However, fO 2 seems to be by far the most important parameter controlling the solubility of S (Jenner et al 2010;Jugo et al 2010;Keith et al 2017).…”

Section: Formation Of Magmatic Sulphides and Their Potential Role As mentioning

confidence: 99%

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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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Deep sourced magma and ore-metal mobility in the D. João de Castro submarine volcano (Azores): a mineral chemistry and melt inclusion study

Marques

Madureira

Zajacz

et al. 2022

Contrib Mineral Petrol

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The D. João de Castro is a submarine volcano with known hydrothermal activity located in the Terceira ultra-slow spreading rift within the Azores triple junction (ATJ). Several well-known mafic and ultramafic rock-hosted seafloor hydrothermal systems lay along the Mid-Atlantic Ridge, to the north and to the south of the Azores platform, yet little is known about seafloor hydrothermal activity, ore-metal availability, and magmatic-hydrothermal interactions within the ATJ. Here, we investigate multi-phase melt inclusions hosted in early formed phenocrysts (olivine, clinopyroxene and plagioclase), and metallic precipitates found in groundmass vesicles. Combining detailed petrographic observations with geochemical data and thermobarometry calculations, we assess P-T conditions of early formed phenocrysts, melt pathways towards surface, timing of sulfide saturation and composition of immiscible sulfide melts. Results show that D. João de Castro is characterized by a multi-level magmatic system where primary melt segregated from the upper mantle and moved up through the oceanic crust with little residence time. Sulfide saturation with the formation of immiscible magmatic sulfide liquid (Fe-Ni-Cu) occurred early in primitive magmas with clinopyroxene and olivine crystallization and continued during plagioclase crystallization. At shallower levels, the magmatic degassing of volatiles carrying base metals (Cu-Zn-Pb-Co) and Ba have contributed to the element budget of the D. João de Castro hydrothermal system. The study of multi-phase melt inclusions and vesicles at D. João de Castro submarine volcano contributes to the understanding of source to surface magmatic processes at the Terceira Rift and underline the importance of magmatic degassing into seafloor hydrothermal systems.

show abstract

Chalcophile elemental compositions of MORBs from the ultraslow-spreading Southwest Indian Ridge and controls of lithospheric structure on S-saturated differentiation

Cited by 35 publications

References 68 publications

Selenium and tellurium systematics in MORBs from the southern Mid-Atlantic Ridge (47–50°S)

Selenium and tellurium systematics in MORBs from the southern Mid-Atlantic Ridge (47–50°S)

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

Deep sourced magma and ore-metal mobility in the D. João de Castro submarine volcano (Azores): a mineral chemistry and melt inclusion study

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