Impact of gneissic layering and localized incipient melting upon melt flow during experimental deformation of migmatites |
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| Institution: | 1. Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris (iSTeP), 4 place Jussieu 75005 Paris, France;2. Univ. d’Orléans, UMR 7327, ISTO, F-45071 Orleans, France;3. CNRS/INSU, UMR 7327, ISTO, F-45071 Orleans, France;4. BRGM, ISTO, UMR 7327, F-45071 Orleans, France;5. Université de Franche Comté, UMR 6249, Laboratoire Chrono-environnement, F-25030 Besancon, France;1. Space Weather Monitoring Center (SWMC), Faculty of Science, Helwan University, Egypt;2. LPP/Polytechnique/UPMC, CNRS, 4 Avenue de Neptune, 94107 Saint-Maur des fossés, France;3. ICTP, Trieste, Italy;4. Lab-STICC UMR 6285 Mines-Télécom Télécom Bretagne, CS 83818, 29288 Brest, Cedex 3, France;1. Université de Lyon, INL, France;2. Université de Lyon, CITI, France;1. Normandie Univ, France; ULH, LMAH, F-76600 Le Havre; FR CNRS 3335, ISCN, 25 rue Philippe Lebon, 76600 Le Havre, France;2. CNRS, LAAS, 7 avenue du Colonel Roche, F-31400 Toulouse, France;3. Université de Toulouse, UPS, LAAS, F-31400 Toulouse, France;4. Université de Toulouse, LAAS, F-31400 Toulouse, France;1. INRA, UMR 1331, Toxalim, Research Centre in Food Toxicology, F-31027 Toulouse, France;2. Université de Toulouse, ENVT, INP, Toxalim, F-31076 Toulouse, France;1. Department of Geology and Mining, College of Natural Resources and Environmental Studies, University of Juba, South Sudan;2. Department of Geosciences and MARUM – Center for Marine Environmental Sciences, University of Bremen, D-28334 Bremen, Germany;3. Department of Mineralogy–Petrology, Technical University Berlin, Ackerstrasse 76, D-13355 Berlin, Germany |
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| Abstract: | In this study, we test experimentally the role of compositional layering as a key parameter for controlling melt flow in a natural migmatite during coaxial deformation. We performed in – situ pure-shear experiments on two natural gneisses. The first gneiss is weakly foliated with minerals homogenously distributed. The second gneiss shows a pronounced compositional layering of alternating quartz – feldspar – rich and biotite – muscovite – rich layers. Experimental conditions were selected to obtain homogeneous melt distribution in the homogeneous gneiss and heterogeneous melt distribution in the layered gneiss. Initial melt distribution is not modified by deformation in experiments on the homogeneous gneiss, implying that melting products did not migrate from their initiation sites. In contrast, melt flowed in shear zones or in inter-boudin positions during experimental deformation of the heterogeneous gneiss. These experiments attest to the strong influence of initial gneissic layering on melting pattern, melt segregation and flow during deformation of partially molten rocks. |
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| Keywords: | Anisotropy Natural gneiss Pure-shear deformation Partially molten |
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