Subduction and Obduction Processes

Chapter 2 Subduction and Obduction Processes The Fate of Oceanic Lithosphere Revealed by Blueschists, Eclogites, and Ophiolites Philippe Agard, Philippe Agard Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorMathieu Soret, Mathieu Soret Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, France Institut des Sciences de la Terre d'Orléans, Université d'Orléans, Orléans, FranceSearch for more papers by this authorGuillaume Bonnet, Guillaume Bonnet Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorDia Ninkabou, Dia Ninkabou Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorAlexis Plunder, Alexis Plunder BRGM (French Geological Survey), Université d'Orléans, Orléans, FranceSearch for more papers by this authorCécile Prigent, Cécile Prigent Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, FranceSearch for more papers by this authorPhilippe Yamato, Philippe Yamato Géosciences Rennes, Université de Rennes 1, Rennes, FranceSearch for more papers by this author Philippe Agard, Philippe Agard Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorMathieu Soret, Mathieu Soret Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, France Institut des Sciences de la Terre d'Orléans, Université d'Orléans, Orléans, FranceSearch for more papers by this authorGuillaume Bonnet, Guillaume Bonnet Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorDia Ninkabou, Dia Ninkabou Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, Paris, FranceSearch for more papers by this authorAlexis Plunder, Alexis Plunder BRGM (French Geological Survey), Université d'Orléans, Orléans, FranceSearch for more papers by this authorCécile Prigent, Cécile Prigent Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, FranceSearch for more papers by this authorPhilippe Yamato, Philippe Yamato Géosciences Rennes, Université de Rennes 1, Rennes, FranceSearch for more papers by this author Book Editor(s):Elizabeth J. Catlos, Elizabeth J. CatlosSearch for more papers by this authorİbrahim Çemen, İbrahim ÇemenSearch for more papers by this author First published: 19 May 2023 https://doi.org/10.1002/9781119773856.ch2Book Series:Geophysical Monograph Series AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Summary Fragments of ancient oceanic lithosphere preserved in mountain belts, though volumetrically subordinate, provide essential insights into past geodynamics and formation and destruction of oceanic lithosphere. This contribution shows how the two types of oceanic fragments, blueschists and eclogites, on one hand, and ophiolites on the other, preserve crucial information on the dynamics of oceanic convergence, that is, subduction and obduction. Their mutual relationships, as well as the similarities and differences in the mechanisms leading to their preservation, allow tracking the evolution of the subduction process through time, from the onset of intraoceanic subduction to the cessation of continental subduction, and, in some cases, to the obduction of ophiolites. Fragments located at the base and immediately below unmetamorphosed (true) ophiolites represent witnesses of intraoceanic subduction initiation and reveal, in particular, initial mechanical resistance to subduction, subsequent cooling, and gradual strain localization. Subducted fragments of oceanic lithosphere metamorphosed as blueschists and eclogites, scraped off the downgoing slab episodically, at shallow or great depths, provide direct access to the composition, structure, and rheology of rocks at the plate interface. 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