untitled
<OAI-PMH schemaLocation=http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd>
<responseDate>2018-01-15T18:26:11Z</responseDate>
<request identifier=oai:HAL:hal-01236013v1 verb=GetRecord metadataPrefix=oai_dc>http://api.archives-ouvertes.fr/oai/hal/</request>
<GetRecord>
<record>
<header>
<identifier>oai:HAL:hal-01236013v1</identifier>
<datestamp>2018-01-11</datestamp>
<setSpec>type:ART</setSpec>
<setSpec>subject:sdu</setSpec>
<setSpec>collection:CNRS</setSpec>
<setSpec>collection:ENSC-LILLE</setSpec>
<setSpec>collection:INRA</setSpec>
<setSpec>collection:GM</setSpec>
<setSpec>collection:UNIV-LORRAINE</setSpec>
<setSpec>collection:AGROPOLIS</setSpec>
<setSpec>collection:INC-CNRS</setSpec>
<setSpec>collection:INSU</setSpec>
<setSpec>collection:UNIV-AG</setSpec>
<setSpec>collection:OTELO-UL</setSpec>
<setSpec>collection:B3ESTE</setSpec>
<setSpec>collection:UNIV-MONTPELLIER</setSpec>
</header>
<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>The role of grain boundaries in the storage and transport of noble gases in the mantle</title>
<creator>Burnard, Pete g.</creator>
<creator>Demouchy, Sylvie</creator>
<creator>Delon, Remi</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Marrocchi, Yves</creator>
<creator>Cordier, Patrick</creator>
<creator>Addad, Ahmed</creator>
<contributor>Centre de Recherches Pétrographiques et Géochimiques (CRPG) ; Université de Lorraine (UL) - 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>Manteau et Interfaces ; 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) - 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>Dynamique de la Lithosphere ; 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) - 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>Unité Matériaux et Transformations - UMR 8207 (UMET) ; Institut National de la Recherche Agronomique (INRA) - Université de Lille, Sciences et Technologies - Ecole Nationale Supérieure de Chimie de Lille (ENSCL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-01236013</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01236013</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01236013</source>
<source>Earth and Planetary Science Letters, Elsevier, 2015, 430, pp.260-270. 〈10.1016/j.epsl.2015.08.024〉</source>
<identifier>DOI : 10.1016/j.epsl.2015.08.024</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2015.08.024</relation>
<language>en</language>
<subject lang=en>noble gases</subject>
<subject lang=en>grain boundaries</subject>
<subject lang=en>olivine</subject>
<subject lang=en>diffusion</subject>
<subject lang=en>partition coefficient</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Mantle noble gases record important and ancient isotopic heterogeneities, which fundamentally influence our understanding of mantle geodynamics, yet these heterogeneities are difficult to fully interpret without understanding the basic mechanisms of noble gas storage and transport in mantle minerals. A series of annealing experiments that mimic mantle conditions (i.e. sub-solidus with natural, polycrystalline, texturally equilibrated olivines at low noble gas partial pressures) show that intergranular interfaces (grain boundaries) are major hosts for noble gases in the mantle, and that interfaces can dramatically fractionate noble gases from their radio-parents (U + Th and K). Therefore, noble gas isotopic heterogeneities in the mantle could result from grain size variations. Fine-grained lithologies (mylonites and ultramylonites, for example) with more grain boundaries will have lower U/3He ratios (compared to a coarse grained equivalent), which, over time, will preserve higher 3He/4He ratios. As predicted by theory of points defect diffusivity, these results show that noble gas diffusion along interfaces is different from those in the grain lattice itself at low temperatures. However, for grain size relevant of the Earth's mantle, the resulting effective correlated activation energies (Ea)(Ea) and pre-exponential factors (Do/a2)(Do/a2) produce similar diffusivities at mantle temperatures for interface- and lattice-hosted helium. Therefore, grain boundaries do not significantly affect helium transport at mantle conditions and length scales.</description>
<date>2015-11-15</date>
</dc>
</metadata>
</record>
</GetRecord>
</OAI-PMH>
