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Journal: EARTH PLANET. SCI. LETT. 458 [2017] 80-91
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Journal: QUATERNARY GEOCHRON. 37 [2017] 15-31
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Journal: GEOLOGY 45 [2017] 79-82
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Journal: EARTH PLANET. SCI. LETT. 457 [2017] 227-237
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Journal: EARTH PLANET. SCI. LETT. 458 [2017] 394-404
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Journal: EARTH PLANET. SCI. LETT. 457 [2017] 149-159
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Journal: J. GEOCHEM. EXPLORATION 173 [2017] 99-109
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Journal: J. GEOL. SOC. LONDON 173 [2016] 76-93
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  • Document
We report combined Re-Os isotope and highly siderophile element data for whole-rock and whole-sulfide grains from Spitsbergen peridotites. The Os-Ir contents in whole-rocks are elevated compared to those of the primitive mantle, but the Pt-Pd-Re contents are depleted, reflecting refractory monosulfide solid solution (Mss) control during mantle melting. There are two general types of sulfide documented in global mantle samples: primary residual Mss with subchondritic Pd/Ir ratios and secondary metasomatic sulfides with suprachondritic Pd/Ir ratios. Most Spitsbergen sulfides have elevated Ir contents, and belong to the residual group. Most but not all Spitsbergen sulfides, however, are unusual in that they show a fractionation of Os (and Ru) from Ir which cannot be reconciled with a simple partial melting process. The Os(+ Ru) fractionation from Ir is most notable in a sample containing mantle-derived carbonate-bearing pockets. Infiltration of carbonate-rich S-undersaturated melt into the Spitsbergen lithospheric mantle may result in the formation of localized S-rich liquid by dissolving residual Mss. Such melt compositions may promote laurite crystallization before Mss, causing the combined depletion of Os + Ru relative to Ir in later-formed Mss. The Re-depletion model ages of residual sulfide grains from Spitsbergen peridotites coincide with crustal ages determined for Spitsbergen, indicating coupled mantle-crust evolution, and furthermore, they coincide with the previously proposed major peaks of pulsed crustal formation periods in Earth at ca. 2.7, 1.9 and 1.2. Ga.
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Journal: MINERAL. PETROL. 110 [2016] 247-268
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