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<title lang=en>The Chenaillet Ophiolite in the French/Italian Alps: An ancient analogue for an Oceanic Core Complex?</title>
<creator>Manatschal, Gianreto</creator>
<creator>Sauter, Daniel</creator>
<creator>Karpoff, Anne Marie</creator>
<creator>Masini, Emmanuel</creator>
<creator>Mohn, Geoffroy</creator>
<creator>Lagabrielle, Yves</creator>
<contributor>Dylbas ; Institut de physique du globe de Strasbourg (IPGS) ; Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS)</contributor>
<contributor>Dynamique de la Lithosphere ; 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>
<description>International audience</description>
<source>ISSN: 0024-4937</source>
<source>Lithos</source>
<publisher>Elsevier</publisher>
<identifier>hal-00617678</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617678</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00617678</source>
<source>Lithos, Elsevier, 2011, 124 (3-4), pp.169-184. 〈10.1016/j.lithos.2010.10.017〉</source>
<identifier>DOI : 10.1016/j.lithos.2010.10.017</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2010.10.017</relation>
<language>en</language>
<subject lang=en>Alpine ophiolites</subject>
<subject lang=en>Oceanic core complexes</subject>
<subject lang=en>Slow spreading ridges</subject>
<subject lang=en>Chenaillet ophiolite</subject>
<subject lang=en>Alpes</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Chenaillet Ophiolite in the Franco-Italian Alps represents a well-exposed ocean-floor sequence that was only weakly overprinted by Alpine metamorphism during its emplacement in the Alpine nappe stack. Pillow lavas showing a Mid Ocean Ridge Basalt (MORB) signature overlie tectonically exhumed gabbros and serpentinized mantle rocks similar to oceanic core complexes (OCC) described from present-day slow- to ultraslow-spreading ridges. Based on detailed mapping it can be shown that: 1) syn-magmatic high-temperature shear zones are truncated by oceanic detachment faults; 2) sediments consisting exclusively of clasts derived from the footwall of the detachment are overlain by voluminous lavas, and 3) emplacement of lavas is linked with high-angle faulting that overprint the oceanic detachment fault. Based on stratigraphic and cross cutting relationships we conclude that: 1) a complex relation between high- and low-temperature shear zones exists, 2) oceanic detachment faults may be obliterated by later emplaced of MOR basalts, and 3) high-angle faults may serve at shallow levels as feeder channels for the overlying pillow basalts. These observations raise questions about the relative relations in time and space between magmatic, hydrothermal and tectonic processes at spreading systems. We propose that the observed change from exhumation along an oceanic detachment fault to high-angle faulting associated with extrusion of volcanic rocks may represent an evolution within a life cycle of a spreading system that may be comparable to present-day slow- to ultraslow-spreading ridges.</description>
<date>2011</date>
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