Behaviour of Ni–PGE–Au–Cu in mafic–ultramafic volcanic suites of the 2.7Ga Kambalda Sequence, Kalgoorlie Terrane, Yilgarn Craton

Said, Nuru; Kerrich, Robert; Maier, Wolfgang D.; McCuaig, T. Campbell

doi:10.1016/j.gca.2011.02.032

Cited by 31 publications

(28 citation statements)

References 122 publications

(204 reference statements)

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“…The nature and stability of the metamorphic fluids in host mineralogy also plays a vital role during secondary processes (Said et al, 2011). Wood (2002) demonstrated that Au, Pt and Pd have variable degrees of mobility but PGE are commonly immobile during hydrothermal alteration and low-grade metamorphism.…”

Section: Pge Mobility During Alteration and Metamorphismmentioning

confidence: 99%

“…Experimental studies and investigation of natural samples have demonstrated that PGE are transported by fluids within a wide range of temperature and variable compositions. According to Wood (2002) Pd, Pt and Au exhibit variable degrees of mobility during hydrothermal alteration and low grade metamorphism, while the other PGEs are relatively immobile (Pan and Wood, 1994;Baker et al, 2001;Peregoedova et al, 2006;Hanley et al, 2008;Cabral et al, 2002;Olivo et al, 2001;Auge et al, 2002;Said et al, 2011). Studies of Neoarchean greenstone belts have indicated extensive mobility of gold (Au) and copper (Cu) in many instances (Wyman et al, 1995;Goldfarb et al, 2005;Feng et al, 1993).…”

Section: Pge Mobility During Alteration and Metamorphismmentioning

confidence: 99%

“…PGE data on komatiites (>3.3-2.6 Ga) have suggested that there is a trend of increase in Pt and Pd abundances to younger ages in both Al-undepleted and Al-depleted komatiites (Puchtel et al, 2004). The Pt/Pd ratios (0.4-1.6) in Bababudan komatiites may be ascribed to HSE depletion during core formation followed by their addition during the long term event, and mixing into Earth's deep mantle (Maier et al, 2009;Said et al, 2011). Based on Re/Os isotopic data, it has been argued that Post-Archean basalts derived from continental lithospheric mantle have relatively low Pt, Pd and Pd/Ir ratios (Irvine et al, 2003;Pearson et al, 2004;Griffin et al, 2009;Said et al, 2011).…”

Section: Bababudan Komatiitesmentioning

confidence: 99%

“…The Pt/Pd ratios (0.4-1.6) in Bababudan komatiites may be ascribed to HSE depletion during core formation followed by their addition during the long term event, and mixing into Earth's deep mantle (Maier et al, 2009;Said et al, 2011). Based on Re/Os isotopic data, it has been argued that Post-Archean basalts derived from continental lithospheric mantle have relatively low Pt, Pd and Pd/Ir ratios (Irvine et al, 2003;Pearson et al, 2004;Griffin et al, 2009;Said et al, 2011). The PGE abundances of Bababudan komatiites are marked by variable Pd (2.8-19 ppb) and Pt (1.4-16.2 ppb) concentrations and a wide range in Pd/Ir ratios from 1.2 to 37.5 suggesting that the PGE compositions of these rocks were influenced by contributions from continental lithospheric mantle and PGE extraction during sulphide segregation.…”

Section: Bababudan Komatiitesmentioning

confidence: 99%

“…These variations indicate low Pd/Ir ratios at low degree of partial melting and high Pd/Ir ratios at high degree of partial melting. When the partial melting reaches up to 20%, sulphides will be consumed which result in increase of Pd content (Barnes and Lightfoot, 2005;Said et al, 2011). Due to this reason, at very higher degrees of partial melting the Pd/Ir ratios will be low (Barnes and Lightfoot, 2005).…”

Section: Bababudan Komatiitesmentioning

confidence: 99%

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Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Saha

Manikyamba

Santosh

et al. 2015

Journal of Asian Earth Sciences

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Section: Pge Mobility During Alteration and Metamorphismmentioning

confidence: 99%

Section: Pge Mobility During Alteration and Metamorphismmentioning

confidence: 99%

Section: Bababudan Komatiitesmentioning

confidence: 99%

Section: Bababudan Komatiitesmentioning

confidence: 99%

Section: Bababudan Komatiitesmentioning

confidence: 99%

See 3 more Smart Citations

Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Saha

Manikyamba

Santosh

et al. 2015

Journal of Asian Earth Sciences

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Platinum group element geochemistry and whole‐rock systematics of the Vempalle sills, Cuddapah Basin, India: Implications on sulphur saturation history, mantle processes, and tectonic setting

Singh

Manikyamba

2019

Geological Journal

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The intracratonic Cuddapah Basin of southern peninsular India has multiple phases of magmatism exposed as mafic intrusives and extrusives in the Vempalle and Tadpatri formations. We report platinum group element geochemistry along with whole‐rock systematics of the mafic sills from the Vempalle Formation to understand their sulphur saturation history, source characteristics, and tectonic setting. These sills are medium‐ to fine‐grained dolerites with plagioclase and pyroxenes as essential minerals exhibiting sub‐ophitic to intergranular texture. Geochemically, they are characterized by moderate MgO (6.3–8.5 wt.%), Ni (55–105 ppm), Cr (20–130 ppm), and ∑PGE (22–61 ppb) contents and exhibit transitional to calc‐alkaline in nature. Primitive mantle‐ and chondrite‐normalized trace and rare earth element patterns display relative enrichment of LILE–LREE over HFSE, suggesting plume‐related intraplate magmatism with contributions from subcontinental lithospheric mantle (SCLM), lithosphere–asthenosphere interaction, crustal contamination, and fractional crystallization. Their REE relationship indicates the generation of parent magma from a heterogeneous source marked by 10–25% polybaric partial melting within spinel and garnet lherzolite domain. Platinum group elements (PGE) geochemistry reveals their sulphur‐undersaturated nature, and sulphide fractionation played a key role in the distribution of PGEs, which is evidenced by their enriched character, moderate degrees of partial melting, and crustal contamination. Further, the negative platinum anomalies in these sills indicate its removal during fractional crystallization, and the enrichment of Pd over Pt endorses the decoupling nature of these elements prior to their emplacement. Diagnostic trace element signatures and their relationship corroborate a riftogenic intraplate tectonic regime for the emplacement of the Vempalle sills through an ocean–continent transition zone.

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Refertilization of depleted mantle peridotite in the Nagaland–Manipur ophiolite, north‐east India: Constraints from PGE, mineral, and whole‐rock geochemistry

Chaubey

Singh

et al. 2022

Geological Journal

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This paper discusses whole‐rock geochemistry, mineral chemistry, and platinum group element (PGE) systematics of depleted mantle rocks (harzburgite and dunite) from the northern part of Nagaland–Manipur Ophiolite (NMO), north‐east India, to comprehend their source features, fractionation behaviour of PGE during magmatic evolution, and its tectonic origin. The studied ultramafic rocks are characterized by a low concentration of CaO (0.57–0.71 wt%), Al2O3 (0.18–0.92 wt%) with ∑REE of 1.135–2.702 ppm and high concentrations of MgO (38.70–44.21 wt%), Cr (1,843–4,572 ppm), and Ni (894–4,138 ppm). They show U‐shaped REE patterns [LREE and HREE enrichment (La/Sm)N = 1.85–4.11, (Dy/Yb)N = 0.51–0.85]. Olivine ranges Fo 88.18 to Fo92.23, whereas Cpx and Opx range En44.84 to En47.89 and En86.37 to En93.37 respectively. The chrome spinel Cr# [Cr/(Cr + Al)] and Mg# [Mg/(Mg + Fe2+)] are 0.47–0.83 and 0.31–0.60, respectively, which indicates recrystallization from a boninitic magma in a Supra‐Subduction Zone setting. Conventional thermometry indicates the equilibration temperatures of the dunite sample yielded high temperatures of ~850°C, suggesting their formation due to later interaction with high‐temperature percolating melts. The PGE contents in harzburgite are low (125.6–142.8 ppb) as compared to the dunite (248–360 ppb). They have high PPGE/IPGE and negative Pt* (Pt/Pt* = 0.73) anomaly, which is characteristic of re‐entry of PPGE into the system via reaction with percolating basaltic melt in the mantle wedge. Significantly higher concentration of PPGEs than IPGEs in the samples, indicating recrystallization of PPGEs with early sulphide fractionation. The presence of significant Rh and Pd enhancements relative to Pt in all samples suggests that Pt was removed during PGE fractionation. This could be one of the reasons for both harzburgite and dunite's sulphide undersaturation. PGE distribution in NMO ultramafic rocks was therefore validated as being governed by sulphide saturation in parental magma and altered not only by partial melting but also by fractionation during their production in the Supra‐Subduction Zone environment.

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Behaviour of Ni–PGE–Au–Cu in mafic–ultramafic volcanic suites of the 2.7Ga Kambalda Sequence, Kalgoorlie Terrane, Yilgarn Craton

Cited by 31 publications

References 122 publications

Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Platinum group element geochemistry and whole‐rock systematics of the Vempalle sills, Cuddapah Basin, India: Implications on sulphur saturation history, mantle processes, and tectonic setting

Refertilization of depleted mantle peridotite in the Nagaland–Manipur ophiolite, north‐east India: Constraints from PGE, mineral, and whole‐rock geochemistry

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