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<datestamp>2018-01-11</datestamp>
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<title lang=en>Determination of selenium and tellurium concentrations in Pyrenean peridotites (Ariege, France): New insight into S/Se/Te systematics of the upper in mantle samples</title>
<creator>Lorand, Jean-Pierre</creator>
<creator>Alard, Olivier</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>
<description>International audience</description>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00544577</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00544577</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00544577</source>
<source>Chemical Geology, Elsevier, 2010, 278 (1-2), pp.120-130. 〈10.1016/j.chemgeo.2010.09.007〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2010.09.007</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2010.09.007</relation>
<language>en</language>
<subject lang=it>Selenium</subject>
<subject lang=it>Tellurium</subject>
<subject lang=it>Upper mantle</subject>
<subject lang=it>Peridotites</subject>
<subject lang=it>Chondrites</subject>
<subject lang=it>Refertilization</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>Whole-rock concentrations of Se and Te were determined in 53 peridotite samples collected in orogenic bodies from the Eastern Pyrenees, including the Lherz massif (33 samples), the type-locality of Iherzolite. Orogenic Iherzolites tectonically emplaced into the continental crust escaped devolatilisation that may strongly alter concentrations of those volatile trace elements in basalt-hosted peridotite xenoliths. The Se and Te concentration ranges (<3.5-100.7 ppb; <1-11 ppb) are consistent with the few analyses of mantle samples yet available, yet extending to higher Se concentrations. In-situ analyses performed by LAM-ICPMS on base metal sulfides indicate that the Se budget is controlled by sulfides whereas a large fraction of Te (50 +/- 30%) does not reside in sulfides. The missing fraction is accounted for by fractional crystallization of Pt-Pd tellurides from Cu-Ni sulfide melts. A maximum of one third of the S budget of Eastern Pyrenean peridotites was added by assimilation of crustal sulfides, which crystallized as pyrite. Disregarding those contaminated samples, some features of the Se and Te systematics (e.g. bivariate plots vs. fertility index) cannot be explained by partial melting processes. The best fit for 33 peridotites (mostly from Lherz) yields higher than chondritic S/Se (3.1213 +/- 500; r(2) = 0.96) for near chondritic Se/Te (8.6 +/- 2; r(2) = 0.9). Our study suggest that such superchondritic S/Se ratios are better explained by petrogenetic processes involving refertilization of harzburgitic lithosphere by metal (Cu,Ni)-rich sulfide melts precipitated along with clinopyroxene and Al-spinel from silicate melts en-route to the surface.</description>
<date>2010</date>
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