Comparative ReOs, SmNd and RbSr isotope and trace element systematics for Archean komatiite flows from Munro Township, Abitibi Belt, Ontario

Walker, Richard J.; Shirey, Steven B.; Stecher, Ole

doi:10.1016/0012-821x(88)90060-x

Cited by 151 publications

(33 citation statements)

References 42 publications

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“…4). To our knowledge, only picritic basalts from the Siberian Traps (Horan et al, 1995) and komatiitic lavas from Munro Township (Walker et al, 1988) and Gorgona Island (Walker et al, 1991) have comparable Os concentrations at similar MgO contents. Figure 5 shows PGE, Ni and Cr abundances plotted (Anders and Grevesse, 1989) as proposed by Bennett et al (2000).…”

Section: Resultsmentioning

confidence: 83%

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

et al. 2005

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We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-basalt lavas of the Emeishan large igneous province, SW China. The absolute concentrations of Os in most of the Emeishan picrites are higher than in picrites from ocean islands and other continental flood basalt provinces, and in estimated primitive mantle. A roughly positive correlation between MgO and Cr and Ni, and no overall correlation of Os or Ir with MgO, show that no Cu-Ni sulfide fractionated during differentiation but rather that olivine and chromite fractionated, implying that the initial picritic magma was sulfide-undersaturated. In addition, Os/Ir ratios are unusually high, suggesting that the picritic magmas may have been contaminated by black shales. Modeling shows that a 7% partial melt of primitive mantle containing 0.01 wt% of sulfides can account for the observed Os, Ir and Ru concentrations in the most primitive picrite if the melt is contaminated by 10 wt% of black shale en route to the surface.

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Section: Resultsmentioning

confidence: 83%

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

et al. 2005

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“…Partition coefficients between the major mantle phases and melt are unknown and bulk distribution coefficients (between bulk solid and liquid) can at best be guessed at. Bulk distribution coefficients estimated for Re and Os vary greatly; values for Re from 1 (Jones and Drake, 1986) to .001 (Walker, et al, 1988) have been reported, as have Os values from .08 (Watson, et al, 1987) to 140 (Walker, et al, 1988). The following discussion will attempt to narrow the reasonable ranges of these values.…”

Section: Re and Os Partitioningmentioning

confidence: 94%

“…There have been two major approaches to estimating Re and Os partition coefficients for silicate melting: inverse calculation based on the concentrations of Re and Os in average basalt and peridotite xenoliths (Walker, et al, 1988 and partitioning experiments on synthetic systems (Jones and Drake, 1986;Watson, et al 1987).…”

Section: Re and Os Partitioningmentioning

confidence: 99%

“…This is done based on simple models involving incremental batch equilibrium. H fractional melting or incremental batch equilibrium is assumed, the very low values of DRe inferred by Walker, et al (1988; are not required to explain the concentrations of Rein basalts and residual peridotites. H the batch melting equation is defined in the normal way:…”

Section: Re Partitioningmentioning

confidence: 99%

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The isotope geochemistry of abyssal peridotites and related rocks

Snow¹

1993

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“…High-precision ages and isotopic data for the mafic-ultramafic rocks are required to constrain this model, notably in the Eastern Tianshan Orogenic Belt. (Lambert et al 1994), Duluth Complex (Ripley et al 1999), Sudbury (Walker et al 1991), Noril'sk-Talnakh (Walker et al 1994), komatiite-associated Ni sulfide ores from Kambalda (Foster et al 1996), Archean lithospheric mantle xenoliths from the Kaapvaal and Siberian cratons ; mantle melts, which include komatiites (Walker et al 1988;Foster et al 1996) and basalts (Martin 1991;Hauri and Hart 1993;Snow and Reisberg 1995); Lewisian lower crustal gneisses ; metalliferous S-rich sediments (Ravizza and Turekian 1992) and chondritic mantle abundances (Walker and Morgan 1989).…”

Section: Tectonic Setting Of the Mafic-ultramafic Associationmentioning

confidence: 99%

SIMS U-Pb zircon dating and Re-Os isotopic analysis of the Hulu Cu-Ni deposit, eastern Tianshan, Central Asian Orogenic Belt, and its geological significance

Han¹,

Xiao

Zhao³

et al. 2013

J. Geosci.

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Exploration of the Hulu Cu-Ni-Co sulfide deposit in Eastern Tianshan, Central Asian Orogenic Belt, has detected horizons of sulfide mineralization in pyroxenite and peridotite units. SIMS U-Pb zircon ages of the gabbro-hosting Cu-Ni-Co sulfide deposit indicate that the Hulu intrusion was emplaced at 282.3 ± 1.2 Ma (95% confidence level, MSWD = 3.30, n = 13). Osmium isotopic data suggest that the Hulu intrusion and associated Cu-Ni mineralization were derived from crustally-contaminated mantle melts. The intrusions clearly show island-arc geochemical signatures, such as negative Nb, Ta, Zr and Ti anomalies and enrichment in LILE. These geochemical tracers indicate that the Hulu mafic-ultramafic intrusions, along with the Cu-Ni deposit, formed as a result of subduction of oceanic crust in the Early Permian. The arc-related geodynamic setting of the Hulu Cu-Ni deposit is unusual for magmatic sulfide deposits. This new type of ore deposit offers an alternative perspective for Cu and Ni exploration.

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Comparative ReOs, SmNd and RbSr isotope and trace element systematics for Archean komatiite flows from Munro Township, Abitibi Belt, Ontario

Cited by 151 publications

References 42 publications

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

The isotope geochemistry of abyssal peridotites and related rocks

SIMS U-Pb zircon dating and Re-Os isotopic analysis of the Hulu Cu-Ni deposit, eastern Tianshan, Central Asian Orogenic Belt, and its geological significance

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