Metamorphic sole formation,emplacement and blueschist facies overprint: early subduction dynamics witnessed by western Turkey ophiolites |
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| Authors: | Alexis Plunder Philippe Agard Christian Chopin Mathieu Soret Aral I Okay Hubert Whitechurch |
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| Institution: | 1. Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris (ISTeP), Paris, France;2. CNRS, UMR 7193, ISTeP, Paris, France;3. IUF, Paris, France;4. Laboratoire de Géologie, Ecole Normale Supérieure – CNRS, UMR 8538, Paris, France;5. Eurasia Institute of Earth Sciences and Department of Geology, Istanbul Technical University, Maslak, Istanbul, Turkey;6. Université de Strasbourg, Strasbourg Cedex, France |
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| Abstract: | The largest ophiolite on Earth, in western Turkey, is a key place to study obduction and early subduction dynamics. Ophiolite remnants derived from the same Neotethyan branch (preserved as a result of long‐lived Late Cretaceous continental subduction and later obduction) are underlain by hundred‐metre‐thick extensive metamorphic soles. These soles formed synchronously, at c. 93 Ma, and were welded to the base of the ophiolite, thereby dating the start of intra‐oceanic subduction. This contribution focuses on the structure, petrology and pressure–temperature evolution of the soles and other subduction‐derived units. Peak pressure–temperature conditions were estimated at 10.5 ± 2 kbar and 800 ± 50 °C for the sole by means of pseudosection calculations using Theriak/Domino and at 12 kbar and 425 °C for the unique, enigmatic blueschist facies overprint of the sole. This study provides clues to the mechanisms of sole underplating during early subduction, later cooling, and the nature of the western Turkey ophiolite. |
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