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<title lang=en>Internal structure of basalt flows: insights from magnetic and crystallographic fabrics of the La Palisse volcanics, French Massif Central</title>
<creator>Boiron, T.</creator>
<creator>Bascou, Jerôme</creator>
<creator>Camps, Pierre</creator>
<creator>Ferré, E.C.</creator>
<creator>Maurice, C.</creator>
<creator>Guy, B.</creator>
<creator>Gerbe, Marie-Christine</creator>
<creator>Launeau, P.</creator>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] - Institut Mines-Télécom [Paris]</contributor>
<contributor>Département Géochimie, environnement, écoulement, réacteurs industriels et cristallisation (GENERIC-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] - Institut Mines-Télécom [Paris] - SPIN</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>Department of Geology (DG) ; Southern Illinois University [Carbondale] (SIU)</contributor>
<contributor>École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris]</contributor>
<contributor>Département GéoSciences et Environnement (GSE-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] - Institut Mines-Télécom [Paris] - SPIN</contributor>
<contributor>Environnement Ville Société (EVS) ; Centre National de la Recherche Scientifique (CNRS) - École nationale supérieure d'architecture de Lyon (ENSAL) - Ecole Nationale Supérieure des Mines de Saint-Etienne - École Nationale des Travaux Publics de l'État (ENTPE) - Université Jean Monnet [Saint-Étienne] (UJM) - Université Jean Moulin - Lyon III - Université Lumière - Lyon 2 (UL2) - École normale supérieure - Lyon (ENS Lyon)</contributor>
<contributor>Laboratoire de Planétologie et Géodynamique de Nantes (LPGN) ; Université de Nantes (UN) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0956-540X</source>
<source>EISSN: 1365-246X</source>
<source>Geophysical Journal International</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>hal-00903561</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903561</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903561/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903561/file/TB-GJI-193-2-Orig.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903561</source>
<source>Geophysical Journal International, Oxford University Press (OUP), 2013, 193 (2), pp.585-602. 〈10.1093/gji/ggs115〉</source>
<identifier>DOI : 10.1093/gji/ggs115</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggs115</relation>
<language>en</language>
<subject lang=en>Europe</subject>
<subject lang=en>Effusive volcanism</subject>
<subject lang=en>Magnetic fabrics and anisotropy</subject>
<subject lang=en>Magnetic mineralogy and petrology</subject>
<subject lang=en>Rock and mineral magnetism</subject>
<subject lang=en>Microstructure</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We present a new interpretation of anisotropy of magnetic susceptibility (AMS) fabrics in basaltic lava flows based on the detailed study of magnetic mineralogy and silicate crystallographic fabric of a Quaternary lava flow from the French Massif Central (La Palisse). We consider the model of AMS fabric imbrication between magnetic foliation and flow surface, as initially proposed for dykes. At the two sampling sites, the concordance between the flow direction deduced from the AMS foliation and that deduced from field observations indicates that the imbrication model could apply to the lava flows. However, the flow senses inferred fromAMSare systematically opposed between the two sampling sites suggesting permutations between K1 and K3 AMS axes, a configuration referred to as inverse fabric. Electron backscatter diffraction (EBSD) measurements show strong lattice-preferred orientations (LPO) for plagioclase, especially the (010) plagioclase plane, which tends to be parallel to the flow. Clinopyroxene LPO remains less marked than plagioclase LPO, whereas titanomagnetite does not display a significant LPO. Comparison between magnetic and crystallographic fabrics suggests that the AMS fabric of the lava flow results from the distribution of titanomagnetite grains, which is in turn controlled by the fabric of the silicate framework. Magnetic hysteresis parameters and anisotropy of remanent magnetization (ARM) measurements exclude a significant contribution from single-domain grains, often called upon to explain inverse magnetic fabrics. The origin of the observed inverse magnetic fabric may relate to the dip of the palaeosurface, which is the only remarkable difference between the two sampling sites. AMS appears as a good tool to determine the direction of basaltic lava flows and coupling with local crystallographic fabric data provides a valuable control of relationships between magnetic fabrics and flow and thus contributes to better constrain the AMS signature of lava flows.</description>
<date>2013</date>
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