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<title lang=en>Trace element evidence for anatexis at oceanic magma chamber roofs and the role of partial melts for contamination of fresh MORB</title>
<creator>Fischert, Lennart a.</creator>
<creator>Erdmann, Martin</creator>
<creator>France, Lyderic</creator>
<creator>Wolff, Paul e.</creator>
<creator>Deloule, Etienne</creator>
<creator>Zhang, Chao</creator>
<creator>GODARD, Marguerite</creator>
<creator>Koepke, J.</creator>
<contributor>Institut für Mineralogie, Leibniz Universität Hannover</contributor>
<contributor>Institut für Mineralogie, Leibniz Universität Hannover</contributor>
<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>Institut für Mineralogie, Leibniz Universität Hannover ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0024-4937</source>
<source>Lithos</source>
<publisher>Elsevier</publisher>
<identifier>hal-01419949</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01419949</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01419949</source>
<source>Lithos, Elsevier, 2016, 260, pp.1-8. 〈10.1016/j.lithos.2016.05.001〉</source>
<identifier>DOI : 10.1016/j.lithos.2016.05.001</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2016.05.001</relation>
<language>en</language>
<subject lang=en>Partial melting</subject>
<subject lang=en>Fast-spreading mid-ocean ridge</subject>
<subject lang=en>Oceanic plagiogranite</subject>
<subject lang=en>Granoblastic hornfels</subject>
<subject lang=en>MORB contamination</subject>
<subject lang=en>Conductive boundary layer</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>At oceanic spreading centers, interactions between magma and hydrothermal convecting systems trigger major physical, thermal, and chemical exchanges. The two-pyroxene hornfels recovered from the base of the sheeted dike sequence at Integrated Ocean Drilling Program (IODP) Site 1256 (equatorial Eastern Pacific) are interpreted as a conducting boundary layer between the underlying axial melt lens and the hydrothermally cooled sheeted dikes. They are cut by numerous small, felsic veins, which were recently interpreted as a product of hydrous partial melting of sheeted dikes. Here, we present trace element compositions of products (melts and residues) of hydrous partial melting experiments using basalts and hornfels from IODP Site 1256 as starting material. The experimental products generated between 910 °C and 970 °C match the natural lithologies from Site 1256 in terms of major and trace element compositions. The compositions of the anatectic melts correspond to the compositions of the felsic veins, while the residual minerals match the compositions of the two-pyroxene hornfels, evidencing that hydrous partial melting is an important magmatic process in the gabbro/dike transition of fast-spreading mid-oceanic ridges. Our results complement previous experimental studies on anatectic processes occurring at the roof of the magma chambers from fast-spreading mid-ocean ridges. Moreover, calculations of mixing and assimilation fractional crystallization using the experimental partial melts as contaminant/assimilant showed that anatectic melts can only be a minor contributor to the contamination process.</description>
<date>2016-09-01</date>
</dc>
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