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<datestamp>2018-01-11</datestamp>
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<title lang=en>Isotopic decoupling during porous melt flow: A case-study in the Lherz peridotite</title>
<creator>Le Roux, Véronique</creator>
<creator>Bodinier, Jean-Louis</creator>
<creator>Alard, Olivier</creator>
<creator>O'Reilly, S. Y.</creator>
<creator>Griffin, W. L.</creator>
<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>ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC) ; Macquarie University</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00413135</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00413135</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00413135</source>
<source>Earth and Planetary Science Letters, Elsevier, 2009, 279 (1-2), pp.76-85. 〈10.1016/j.epsl.2008.12.033〉</source>
<identifier>DOI : 10.1016/j.epsl.2008.12.033</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.12.033</relation>
<language>en</language>
<subject lang=en>isotopic decoupling</subject>
<subject lang=en>melt transport</subject>
<subject lang=en>diffusion</subject>
<subject lang=en>melt-rock reaction</subject>
<subject lang=en>Lherz peridotites</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Most peridotite massifs and mantle xenoliths show a wide range of isotopic variations, often involving significant decoupling between Hf, Nd and Sr isotopes. These variations are generally ascribed either to mingling of individual components of contrasted isotopic compositions or to time integration of parent-element enrichment by percolating melts/fluids, superimposed onto previous depletion event(s). However, strong isotopic decoupling may also arise during porous flow as a result of daughter-elements fractionation during solid-liquid interaction. Although porous flow is recognized as an important process in mantle rocks, its effects on mantle isotopic variability have been barely investigated so far. The peridotites of the Lherz massif (French Pyrenees) display a frozen melt percolation front separating highly refractory harzburgites from refertilized lherzolites. Isotopic signatures observed at the melt percolation front show a strong decoupling of Hf from Nd and Sr isotopes that cannot be accounted for by simple mixing involving the harzburgite protolith and the percolating melt. Using one dimensional percolation-diffusion and percolation-reaction modeling, we show that these signatures represent transient isotopic compositions generated by porous flow. These signatures are governed by a few critical parameters such as daughter element concentrations in melt and peridotite, element diffusivity, and efficiency of isotopic homogenization rather than by the chromatographic effect of melt transport and the refertilization reaction. Subtle variations in these parameters may generate significant inter-isotopic decoupling and wide isotopic variations in mantle rocks. (C) 2009 Elsevier B.V. All rights reserved.</description>
<date>2009</date>
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