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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Geochemistry of a long in-situ section of intrusive slow-spread oceanic lithosphere: Results from IODP Site U1309 (Atlantis Massif, 30 degrees N Mid-Atlantic-Ridge)</title>
<creator>Godard, Marguerite</creator>
<creator>Awaji, S.</creator>
<creator>Hansen, H.</creator>
<creator>Hellebrand, E.</creator>
<creator>Brunelli, D.</creator>
<creator>Johnson, K.</creator>
<creator>Yamasaki, T.</creator>
<creator>Maeda, J.</creator>
<creator>Abratis, M.</creator>
<creator>Christie, D.</creator>
<creator>Kato, Y.</creator>
<creator>Mariet, C.</creator>
<creator>Rosner, M.</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>Department of Geosystem Engineering, University of Tokyo ; Université du Québec</contributor>
<contributor>University of Bergen, Department of Earth Science ; Université du Québec</contributor>
<contributor>University of Hawaii, Dept. of Geology and Geophysics, Honolulu ; Université du Québec</contributor>
<contributor>Dipartimento di Scienze della Terra, Università di Modena ; Université du Québec</contributor>
<contributor>Univ Hyogo, Dept Mat Sci & Engn, ; Univ Hyogo</contributor>
<contributor>Institute of Geosciences, University of Jena ; Université du Québec</contributor>
<contributor>West Coast & Polar Regions Undersea Research Center, University of Alaska, Fairbanks ; Université du Québec</contributor>
<contributor>Laboratoire Pierre Süe (LPS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>University of Bremen, Petrology of the Oceanic Crust ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00413562</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00413562</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00413562</source>
<source>Earth and Planetary Science Letters, Elsevier, 2009, 279 (1-2), pp.110-122. 〈10.1016/j.epsl.2008.12.034〉</source>
<identifier>DOI : 10.1016/j.epsl.2008.12.034</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.12.034</relation>
<language>en</language>
<subject lang=en>Mid-Atlantic Ridge</subject>
<subject lang=en>oceanic gabbro</subject>
<subject lang=en>bulk-hole composition</subject>
<subject lang=en>geochemistry</subject>
<subject lang=en>ICP-MS</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>IODP Site U1309 was drilled at Atlantis Massif, an oceanic core complex, at 30 degrees N on the Mid-Atlantic Ridge (MAR). We present the results of a bulk rock geochemical study (major and trace elements) carried out on 228 samples representative of the different lithologies sampled at this location. Over 96% of Hole U1309D is made up of gabbroic rocks. Diabases and basalts cross-cut the upper part of the section; they have depleted MORB compositions similar to basalts sampled at MAR 30 degrees N. Relics of mantle were recovered at shallow depth. Mantle peridotites show petrographic and geochemical evidence of extensive melt-rock interactions. Gabbroic rocks comprise: olivine-rich troctolites (>70% modal olivine) and troctolites having high Mg# (82-89), high Ni (up to 2300 ppm) and depleted trace element compositions (Yb 0.06-0.8 ppm); olivine gabbros and gabbros (including gabbronorites) with Mg# of 60-86 and low trace element contents (Yb 0.125-2.5 ppm); and oxide gabbros and leucocratic dykes with low Mg# (<50), low Ni (similar to 65 ppm) and high trace element contents (Yb up to 26 ppm). Troctolites and gabbros are amongst the most primitive and depleted oceanic gabbroic rocks. The main geochemical characteristics of Site U1309 gabbroic rocks are consistent with a formation as a cumulate sequence after a common parental MORB melt, although (lack of systematic) downhole variations indicate that the gabbroic series were built by multiple magma injections. In detail, textural and geochemical variations in olivine-rich troctolites and gabbronorites suggest chemical interaction (assimilation?) between the parental melt and the intruded lithosphere. Site U1309 gabbroic rocks do not represent the complementary magmatic product of 30 degrees N volcanics, although they sample the same mantle source. The bulk trace element composition of Site U1309 gabbroic rocks is similar to primitive MORB melt compositions; this implies that there was no large scale removal of melts from this gabbro section. The occurrence of such a large magmatic sequence implies that a high magmatic activity is associated with the formation of Atlantis Massif. Our results suggest that almost all melts feeding this magmatic system stays trapped into the intruded lithosphere.</description>
<date>2009</date>
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