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<publisher>HAL CCSD</publisher>
<title lang=en>Unravelling the effects of melt depletion and secondary infiltration on mantle Re-Os isotopes beneath the French Massif Central</title>
<creator>Harvey, J.</creator>
<creator>Gannoun, A.</creator>
<creator>Burton, K. W.</creator>
<creator>Schiano, P.</creator>
<creator>Rogers, N. W.</creator>
<creator>Alard, Olivier</creator>
<contributor>Department of Earth and Environmental Sciences, The Open University, Milton Keynes ; Université du Québec</contributor>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - 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: 0016-7037</source>
<source>EISSN: 0016-7037</source>
<source>Geochimica et Cosmochimica Acta</source>
<publisher>Elsevier</publisher>
<identifier>hal-00454537</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00454537</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00454537</source>
<source>Geochimica et Cosmochimica Acta, Elsevier, 2010, 74 (1), pp.293-320. 〈10.1016/j.gca.2009.09.031〉</source>
<identifier>DOI : 10.1016/j.gca.2009.09.031</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2009.09.031</relation>
<language>en</language>
<subject lang=en>spinel-peridotite xenoliths</subject>
<subject lang=en>subcontinental lithospheric mantle</subject>
<subject lang=en>platinium group elements</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>Spinel lherzolite xenoliths from Mont Briancon, French Massif Central, retain evidence for multiple episodes of melt depletion and melt/fluid infiltration (metasomatism). Evidence for primary melt depletion is still preserved in the co-variation of bulk-rock major elements (MgO 38.7-46.1 wt.%; CaO 0.9-3.6 wt.%), and many samples yield unradiogenic bulk-rock Os isotope ratios (Os-187/Os-188 = 0.11541-0.12626). However, many individual xenoliths contain interstitial glasses and melt inclusions that are not in equilibrium with the major primary minerals. Incompatible trace element mass balance calculations demonstrate that metasomatic components comprise a significant proportion of the bulk-rock budget for these elements in some rocks, ranging to as much as 25%, of Nd and 40% of Sr Critically, for Re-Os geochronology, melt/fluid infiltration is accompanied by the mobilisation of Sulfide. Consequently, bulk-rock isotope measurements, whether using lithophile (e.g. Rb-Sr, Sm-Nd) or siderophile (Re-Os) based isotope systems, may only yield a perturbed and/or homogenised average of these multiple events.;Osmium mass balance calculations demonstrate that bulk-rock Os in peridotite is dominated by contributions from two populations of sulfide grain: (i) interstitial, metasomatic Sulfide with low [Os] and radiogenic Os-187/Os-188, and (ii) primary sulfides with high [Os] and unradiogenic Os-187/Os-188, which have been preserved within host silicate grains and shielded from interaction with transient melts and fluid. The latter can account for >97% of bulk-rock Os and preserve geochronological information of the melt from which they originally precipitated as an immiscible liquid. The Re-depletion model ages of individual primary sulfide grains preserve evidence for melt depletion beneath the Massif Central from at least 1.8 Gyr ago despite the more recent metasomatic event(s). (C) 2009 Elsevier Ltd. All rights reserved.</description>
<date>2010</date>
</dc>
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