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<datestamp>2018-01-11</datestamp>
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<title lang=en>Chondrule trace element geochemistry at the mineral scale</title>
<creator>Jacquet, Emmanuel</creator>
<creator>Alard, Olivier</creator>
<creator>Gounelle, Matthieu</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>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>Institut Universitaire de France (IUF) ; Ministère de l'Éducation nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)</contributor>
<description>International audience</description>
<source>ISSN: 1086-9379</source>
<source>EISSN: 1945-5100</source>
<source>Meteoritics and Planetary Science</source>
<publisher>Wiley</publisher>
<identifier>hal-00795434</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00795434</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00795434</source>
<source>Meteoritics and Planetary Science, Wiley, 2012, 47 (11), pp.1695-1714. 〈10.1111/maps.12005〉</source>
<identifier>DOI : 10.1111/maps.12005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/maps.12005</relation>
<language>en</language>
<subject lang=de>geochemistry</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>We report trace element analyses from mineral phases in chondrules from carbonaceous chondrites (Vigarano, Renazzo, and Acfer 187), carried out by laser ablation inductively coupled plasma-mass spectrometry. Results are similar in all three meteorites. Mesostasis has rare earth element (REE) concentrations of 10-20 × CI. Low-Ca pyroxene has light REE (LREE) concentrations near 0.1 × CI and heavy REE (HREE) near 1 × CI, respectively. Olivine has HREE concentrations at 0.1-1 × CI and LREE around 10−2 × CI. The coarsest olivine crystals tend to have the most fractionated REE patterns, indicative of equilibrium partitioning. Low-Ca pyroxene in the most pyroxene-rich chondrules tends to have the lowest REE concentrations. Type I chondrules seem to have undergone a significant degree of batch crystallization (as opposed to fractional crystallization), which requires cooling rates slower than 1-100 K h−1. This would fill the gap between igneous calcium-aluminum-rich inclusions (CAIs) and type II chondrules. The anticorrelation between REE abundances and pyroxene mode may be understood as due to dilution by addition of silica to the chondrule melt, as in the gas-melt interaction scenario of Libourel et al. (2006). The rapid cooling rate (of the order of 1000 K h−1) which seems recorded by low-Ca pyroxene, contrasted with the more diverse record of olivine, may point to a nonlinear cooling history or suggest that formation of pyroxene-rich chondrule margins was an event distinct from the crystallization of the interior.</description>
<date>2012-11</date>
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