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- W1640923193 abstract "Extraction of metal-rich core likely resulted in strong depletion of the silicate portion of Earth in highly siderophile elements (HSE), including Re, Os, and Pt. Replenishment of HSE through a ‘late veneer’, or high-pressure equilibrium between metal and silicate have been proposed to explain the excess of HSE relative to that expected from core extraction at lower pressures. To address these issues on core extraction, late accretion and terrestrial mantle evolution, 30 Os-rich alloys from upper mantle peridotites, and 13 samples of carbonaceous, enstatite and ordinary chondrites, were measured for high-precision Os isotopic compositions on the JSC Triton. Two of the Os-rich alloys with present-day Os/Os of 0.1095 and 0.1096 have Os/Os of 0.1198320 and 0.1198329, respectively. They have Os model ages of 2.8 Ga. The measured Os/Os for these two samples are within uncertainty of the initial ratio of 0.1198323±09 for 2.7 Ga Pyke Hill komatiites and constrains the Pt-Os upper mantle evolution curve. The remaining 28 Os-rich alloys with Os/Os from 0.1167 to 0.1596 have a range in Os/Os from 0.1198352 to 0.1198408, with an average of 0.1198382±29 (2σ). Carbonaceous chondrites have Os/Os of ≤ 0.1198352 (n=3). Ordinary chondrites have Os/Os from 0.1198345 to 0.1198408 (n=7), and enstatite chondrites from 0.1198335 to 0.1198401 (n=3), with averages of 0.1198387±12, and 0.1198374±40, respectively. The enstatite and ordinary chondrite time evolution curves match those for the Pyke Hill komatiites and the 2.8 Ga Osrich alloy mantle sources. These Os/Os relationships between Os-rich alloys and enstatite and ordinary chondrites are consistent with previous arguments based on Os/Os systematics for a late veneer of similar types of materials controlling the HSE budget of the upper mantle. Unless liquid metal/silicate melt partition coefficients for Pt and Os are within about 10% of each other, a high pressure core extraction model will not alone explain these Os/Os compositions. Pt-Re-Os isotope and HSE systematics of 2.8 Ga komatiites I.S. PUCHTEL, A.D. BRANDON, M. HUMAYUN AND R.J. WALKER Department of Geology, University of Maryland, College Park, MD 20742, USA (ipuchtel@umd.edu) NASA Johnson Space Center, Mail Code SR, Building 31, Houston, TX 77058, USA NHMFL & Department of Geological Sciences, Florida State University, Tallahassee, FL 32310, USA" @default.
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- W1640923193 date "2005-05-01" @default.
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- W1640923193 title "Platinum-Osmium isotope evolution of the Earth's mantle" @default.
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