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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Platinum-group element micronuggets and refertilization process in Lherz orogenic peridotite (northeastern Pyrenees, France)</title>
<creator>Lorand, Jean-Pierre</creator>
<creator>Alard, Olivier</creator>
<creator>Luguet, Ambre</creator>
<contributor>Laboratoire de minéralogie du Muséum National d'Histoire Naturelle (LMMNHN) ; Muséum National d'Histoire Naturelle (MNHN) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Steinmann Institut-Endogene Prozesse. Universität Bonn ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00486109</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00486109</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00486109</source>
<source>Earth and Planetary Science Letters, Elsevier, 2010, 289 (1-2), pp.298-310. 〈10.1016/j.epsl.2009.11.017〉</source>
<identifier>DOI : 10.1016/j.epsl.2009.11.017</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2009.11.017</relation>
<language>en</language>
<subject lang=en>highly siderophile elements</subject>
<subject lang=en>upper mantle</subject>
<subject lang=en>orogenic peridotites</subject>
<subject lang=en>platinum-group minerals</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Highly siderophile elements (Platinum-group elements, Au and Re) are currently assumed to reside inside base metal sulfides (BMS) in the convecting upper mantle. However, fertile lherzolites sampled by Pyrenean orogenic peridotite massifs are unexpectedly rich in 0.5-3 mu m large micronuggets of platinum-group minerals (PGM). Among those, sulfides from the laurite-erlichmanite series (Ru, Os(Ir)S(As)2), Pt-Ir-Os alloys and Pt-Pd-Te-Bi phases (moncheite-merenskyite) are predominant. Not only the BMS phases but also the PGM micronuggets must be taken into account in calculation of the PGE budget of orogenic fertile lherzolites. Laurite is a good candidate for equilibrating the whole-rock budget of Os, it and Ru while accounting for supra-chondritic Ru/Ir-N. Textural relationships between PGMs and BMS highlight heterogeneous mixing between refractory PGMs (laurite/Pt-Ir-Os alloys) inherited from ancient refractory lithospheric mantle and late-magmatic metasomatic sulfides precipitated from tholeiitic melts. "Low-temperature" PGMs, especially Pt-Pd bismuthotellurides should be added to the list of mineral indicators of lithosphere refertilization process. Now disseminated within fertile lherzolites, "lithospheric" PGMs likely account for local preservation of ancient Os model ages (up to 2 Ga) detected in BMS by in-situ isotopic analyses. These PGMs also question the reliability of orogenic lherzolites for estimating the PGE signature of the Primitive Silicate Earth.</description>
<date>2010</date>
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