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<title lang=en>Diagenetic modulation of the magnetic properties in sediments from the Northern Indian Ocean </title>
<creator>Bouilloux, Alexandra</creator>
<creator>Valet, Jean-Pierre</creator>
<creator>Bassinot, Franck</creator>
<creator>Joron, Jean-Louis</creator>
<creator>Blanc-Valleron, Marie-Madeleine</creator>
<creator>Moreno, Eva</creator>
<creator>Dewilde, Fabien</creator>
<creator>Kars, Myriam</creator>
<creator>Lagroix, France</creator>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) - Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'Etudes des Eléments Légers (LEEL - UMR 3685) ; Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685) ; Centre National de la Recherche Scientifique (CNRS) - Institut Rayonnement Matière de Saclay (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay - Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay - Centre National de la Recherche Scientifique (CNRS) - Institut Rayonnement Matière de Saclay (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay - Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay</contributor>
<contributor>Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P) ; Muséum National d'Histoire Naturelle (MNHN) - Université Pierre et Marie Curie - Paris 6 (UPMC) - 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>
<description>International audience</description>
<source>ISSN: 1525-2027</source>
<source>EISSN: 1525-2027</source>
<source>Geochemistry, Geophysics, Geosystems</source>
<publisher>AGU and the Geochemical Society</publisher>
<identifier>insu-01311064</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01311064</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01311064/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01311064/file/ggge2013-14-3779-bouilloux.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01311064</source>
<source>Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2013, 14, pp.3779-3800. 〈10.1002/ggge.20234〉</source>
<identifier>DOI : 10.1002/ggge.20234</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1002/ggge.20234</relation>
<language>en</language>
<subject lang=en>paleomagnetism</subject>
<subject lang=en>paleoenvironment</subject>
<subject lang=en>goethite</subject>
<subject lang=en>magnetite</subject>
<subject lang=en>Indian ocean Index Terms: 1512 Environmental</subject>
<subject>[SDU] Sciences of the Universe [physics]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>[1] Large changes in magnetic mineral concentration dependent parameters by more than 1 order of magnitude occur over 50–150 cm intervals in two marine sediment cores from the oxygen minimum zone in the Gulf of Aden. High-resolution sedimentological and chemical analyses indicate that these intervals are not associated with turbiditic events or sediment reworking, they do not result from changes in carbonate dilution or differences in sediment properties, and they do not correspond to volcanic layers. Magnetic mineralogical analyses reveal a change in magnetic mineral concentration from a magnetite-goethite assemblage to pure magnetite within the peak. The peaks almost disappear when the abundance of magnetic minerals is calculated after correcting for the magnetic moments of each magnetic mineral. Therefore, under the assumption that the variability of the magnetic parameters results from postdepositional mineralogical transformations, a relatively constant amount of magnetite was present at the surface of the sediment. Changes in redox conditions and nonsteady state diagenesis transformations have effectively been observed along both cores. Large values of total organic carbon coincide with poor preservation of biogenic and detrital magnetite, which reflects reductive dissolution of the finer magnetite grains. At the same levels, Fe 2þ release from reductively dissolved magnetite favored precipitation of goethite. The susceptibility peaks coincide with episodes of magnetite preservation caused by reduced surface</description>
<date>2013-09-23</date>
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