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Experimental studies of planetary accretion and differentiation

Grant number: 10/05512-1
Support Opportunities:Research Grants - Young Investigators Grants
Duration: September 01, 2010 - November 30, 2013
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Guilherme Mallmann
Grantee:Guilherme Mallmann
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):10/15341-0 - Experimental studies of planetary accretion and differentiation, BP.JP


The term siderophile was introduced by Victor M. Goldschmidt to describe those elements that occur in the metallic phases of meteorites and, by inference, the metallic cores of planets. Their defining property of preferentially partitioning into metal relative to silicate phases provides unique insights into planetary accretion and differentiation. For instance, the absolute and relative abundances of siderophile elements may be used to identify the building blocks of terrestrial planets, trace core-mantle differentiation processes and the chemical interactions between these two reservoirs, as well as the late accretion histories of diverse planetary bodies like the Earth, Moon and Mars. Despite their importance, still very little is known about the geochemical properties of siderophile elements at the high temperature and pressure conditions relevant to planetary formation. Hence, the interpretation of an enormous amount of analytical data acquired by geochemists over the last two decades remains controversial. This is particularly so for the highly siderophile elements, HSE (Ru, Rh, Pd, Os, Ir, Pt, Au and Re). This proposal seeks support toinvestigate experimentally the geochemical behaviour of the HSEs, particularly in regardsto the effect of intensive variables such as temperature, pressure and oxygen fugacity onthe partitioning of these elements between metal, minerals and silicate melt. As an additionalbenefit, the first laboratory dedicated exclusively to experimental petrology andgeochemistry will be installed in Brazil, opening up the possibility of a vast range of futureresearch endeavours in the experimental area in the country and elevating the status of Brazilian petrology and geochemistry internationally. (AU)

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MALLMANN, GUILHERME; FONSECA, RAUL O. C.; SILVA, ADOLFO B.. An experimental study of the partitioning of trace elements between rutile and silicate melt as a function of oxygen fugacity. Anais da Academia Brasileira de Ciências, v. 86, n. 4, p. 1609-1629, . (10/05512-1)
FONSECA, RAUL O. C.; MALLMANN, GUILHERME; SPRUNG, PETER; SOMMER, JOHANNA E.; HEUSER, ALEXANDER; SPEELMANNS, IRIS M.; BLANCHARD, HENRIK. Redox controls on tungsten and uranium crystal/silicate melt partitioning and implications for the U/W and Th/W ratio of the lunar mantle. Earth and Planetary Science Letters, v. 404, p. 1-13, . (10/05512-1)
AVILA, JANAINA N.; IRELAND, TREVOR R.; GYNGARD, FRANK; ZINNER, ERNST; MALLMANN, GUILHERME; LUGARO, MARIA; HOLDEN, PETER; AMARI, SACHIKO. Ba isotopic compositions in stardust SiC grains from the Murchison meteorite: Insights into the stellar origins of large SiC grains. GEOCHIMICA ET COSMOCHIMICA ACTA, v. 120, p. 628-647, . (10/05512-1)
FONSECA, RAUL O. C.; LAURENZ, VERA; MALLMANN, GUILHERME; LUGUET, AMBRE; HOEHNE, NADINE; JOCHUM, KLAUS PETER. New constraints on the genesis and long-term stability of Os-rich alloys in the Earth's mantle. GEOCHIMICA ET COSMOCHIMICA ACTA, v. 87, p. 227-242, . (10/05512-1)
FARIAS VLACH, SILVIO ROBERTO; SALAZAR-NARANJO, ANDRES FABIAN; TORRES-CORREDOR, JOHAN SANTIAGO; DE CARVALHO, PAULO RAFAEL; MALLMANN, GUILHERME. Calibration of high-temperature furnace assemblies for experiments between 200 and 600 MPa with end-loaded piston-cylinder apparatuses. BRAZILIAN JOURNAL OF GEOLOGY, v. 49, n. 1, . (12/06082-6, 10/05512-1)
MALLMANN, GUILHERME; O'NEILL, HUGH ST C.. Calibration of an Empirical Thermometer and Oxybarometer based on the Partitioning of Sc, Y and V between Olivine and Silicate Melt. JOURNAL OF PETROLOGY, v. 54, n. 5, p. 933-949, . (10/05512-1)
FONSECA, RAUL O. C.; MALLMANN, GUILHERME; O'NEILL, HUGH ST C.; CAMPBELL, IAN H.; LAURENZ, VERA. Solubility of Os and Ir in sulfide melt: Implications for Re/Os fractionation during mantle melting. Earth and Planetary Science Letters, v. 311, n. 3-4, p. 339-350, . (10/05512-1)

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