Fractionation of the noble metals by physical processes

Ballhaus, Chris; Bockrath, Conny; Wohlgemuth‐Ueberwasser, Cora C.; Laurenz, Vera; Berndt, Jasper

doi:10.1007/s00410-006-0126-z

Cited by 208 publications

(122 citation statements)

References 84 publications

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“…m" 3 (Ballhaus et al, 2006). This speed is negligible compare to speed of magma rising at eruption which is in the order of meters per seconds (Schubert et al, 2001).…”

Section: Sulphide Droplets Transport To the Surfacementioning

confidence: 90%

Étude du comportement des éléments hautement sidérophiles et chalcophiles dans les gouttelettes sulfurées de MORB /

Patten¹

2012

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“…m" 3 (Ballhaus et al, 2006). This speed is negligible compare to speed of magma rising at eruption which is in the order of meters per seconds (Schubert et al, 2001).…”

Section: Sulphide Droplets Transport To the Surfacementioning

confidence: 90%

Étude du comportement des éléments hautement sidérophiles et chalcophiles dans les gouttelettes sulfurées de MORB /

Patten¹

2012

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“…During melting, Ir and Os are strongly partitioned into the MSS, whereas Cu, Pt and Pd are partitioned into the coexisting melt (Brenan et al 2016 this volume). Monosulfide solid solution at 900-1100 ºC can accommodate > 10 4 µg·g −1 of Os, Ir, Ru, and Rh (Li et al 1996;Alard et al 2000;Brenan 2002;Mungall et al 2005;Ballhaus et al 2006), while pentlandite, chalcopyrite, and pyrrhotite can accommodate from 10 2 -10 3 µg·g −1 of each PGE (e.g., Peach et al 1990;Fleet et al 1996;Fonseca et al 2011). …”

Section: Base-metal Sulfide Occurrence Major Element Geochemistry Anmentioning

confidence: 99%

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Harvey¹,

Warren²,

Shirey³

2016

Highly Siderophile and Strongly Chalcophile Elements in High-Temperature Geochemistry and Cosmochemistry

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“…Ballhaus et al, 2006). During partial melting of fertile mantle rocks, base metal sulfides melt to form a Cu-rich-sulfide melt and a more refractory sulfide solid-solution residue which concentrates the compatible PGE, namely Os, Ir, and Ru (Bockrath et al, 2004;Ballhaus et al, 2006;Luguet et al, 2007;Fonseca et al, 2012).…”

Section: The Formation Of Os-rich Alloysmentioning

confidence: 99%

Osmium isotope compositions of detrital Os-rich alloys from the Rhine River provide evidence for a global late Mesoproterozoic mantle depletion event

Dijkstra

Dale

Oberthür

et al. 2016

Earth and Planetary Science Letters

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Citation for published item:hijkstrD eFrF nd hleD gFF nd yerth¤ urD F nd xowellD qFwF nd ersonD hFqF @PHITA 9ysmium isotope ompositions of detritl ysErih lloys from the hine iver provide evidene for glol lte wesoproterozoi mntle depletion eventF9D irth nd plnetry siene lettersFD RSP F ppF IISEIPPF Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractWe report osmium isotopic compositions for 297 mantle-derived detrital Ru-Os-Ir alloy grains found in gold and platinumgroup mineral bearing placers of the Rhine River. These alloys were likely formed as a result of high degree melting in the convective mantle and derived from residual Paleozoic mantle peridotites in the Alps of Central Europe that were accreted as part of a collage of Gondwana-derived 'Armorican' terranes before the Variscan Orogeny. The 187 Os/ 188 Os isotope ratios of the Os-rich alloys show a wide distribution, with two modes at 0.1244 and 0.1205. These two modes correspond to rhenium depletion ages, interpreted to correspond with episodes of high-degree mantle melting, at ~0.5 and ~1.1 Ga. The data confirm the ability of the oceanic mantle to preserve evidence of ancient melting events. Our new data, in combination with published data on Os-rich alloys from the Urals and Tasmania and with data for abyssal peridotites, indicate a geographically widespread record of a major global Late Mesoproterozoic (1.0-1.2 Ga) high-degree melting event in Paleozoic oceanic mantle rocks. This model age peak is essentially absent from the crustal record of Central-Western Europe, but does coincide with the apparent peak in global continental crust zircon ages at this time. Thus, high-degree mantle melting peaking in the 1.0-1.2 Ga interval may have affected a large part of Earth's mantle. This interval occurred during a period of relative super-continental stability, which may have been accompanied in the oceanic realm by rapid seafloor spreading and extensive subduction, and by unusually high activity of mantle plumes forming two active mantle superswells.

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Fractionation of the noble metals by physical processes

Cited by 208 publications

References 84 publications

Étude du comportement des éléments hautement sidérophiles et chalcophiles dans les gouttelettes sulfurées de MORB /

Étude du comportement des éléments hautement sidérophiles et chalcophiles dans les gouttelettes sulfurées de MORB /

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Osmium isotope compositions of detrital Os-rich alloys from the Rhine River provide evidence for a global late Mesoproterozoic mantle depletion event

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