Temperature dependence of Pt and Rh solubilities in a haplobasaltic melt

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doi: 10.1016/S0016-7037(02)01047-5
Authors:Fortenfant, Sophie S.; Günther, D.; Dingwell, D. B.; Rubie, D. C.
Author Affiliations:Primary:
University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany
Other:
ETH Zürich, Switzerland
University of Munich, Federal Republic of Germany
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 67(1), p.123-131. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:2003
Note:In English. 29 refs.; illus., incl. 2 tables
Summary:The temperature dependence of the solubilities of Pt and Rh in a haplobasaltic (anorthite-diopside 1-bar eutectic composition) melt has been investigated at 1 bar and 1300 to 1550°C using the mechanically assisted equilibration technique (Dingwell et al., 1994). The experiments were performed at almost constant oxygen fugacity (log fO2 = -2.5±0.3) over the entire temperature range. Major element concentrations in the quenched glass samples were determined using an electron microprobe. Pt and Rh concentrations were obtained by laser ablation inductive coupled plasma mass spectrometry. From our data, we obtain the following expressions for the solubilities of pure Pt and pure Rh in anorthite-diopside eutectic melt at 1 bar and log fO2 = -2.5: log[Pt](ppm) = -3320(340)/T(K)+2.0(0.2) r2 = 0.96, log[Rh](ppm) = -5440(450)/T(K)+3.9(0.3) r2 = 0.97. Metal-silicate partition coefficients estimated from these results at likely conditions of core formation (3000 K and an oxygen fugacity 2 orders of magnitude below the iron-wustite oxygen buffer; e.g., Righter and Drake, 1997) are 6.1×108 and 3.9×106 for Pt and Rh, respectively. On the basis of these results, high temperature is not sufficient to explain the abundances of these highly siderophile elements in the Earth's mantle as a consequence of metal-silicate equilibrium during core formation. Abstract Copyright (2003) Elsevier, B.V.
Sections:Experimental mineralogy
Subsections:General
Subjects:Anorthite; Basaltic composition; Chain silicates; Clinopyroxene; Concentration; Diopside; Electron probe data; Experimental studies; Feldspar group; Framework silicates; Geochemistry; ICP mass spectra; Laboratory studies; Laser ablation; Laser methods; Major elements; Mantle; Mass spectra; Melts; Metals; Partition coefficients; Phase equilibria; Plagioclase; Platinum; Platinum group; Pyroxene group; Rhodium; Siderophile elements; Silicates; Solubility; Spectra; Temperature; Trace elements
Abstract Numbers:03M/2709
Record ID:2003018187
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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