Partial melting and retrogression during exhumation of high-grade metapelites,the Tatra Mountains,Western Carpathians |
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| Institution: | 1. Department of Geological Sciences, Salem State University, 352 Lafayette St., Salem, MA 01970, USA;2. Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA;3. Department of Geology, Colorado College, Colorado Springs, CO 80903, USA;4. U.S. Geological Survey, Denver Federal Center, MS 963, Denver, CO 80225, USA;5. Research School Earth Sciences, Australian National University, Canberra, ACT 0200, Australia;1. Geophysics, Department of Physics, University of Oulu, Finland;2. Department of Earth Sciences, Geophysics, Uppsala University, Uppsala, Sweden;3. Institute of Geophysics, ETH Zürich;1. Department of Earth Science, University of Bergen, Allégaten 41, N-5007 Bergen, Norway.;2. Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, N-0316 Oslo, Norway;3. Geology Section, Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Institut des Sciences de la Terre d''Orléans, Université d''Orléans, 45067 Orléans Cedex 2, France;1. University of Kentucky, Department of Earth and Environmental Sciences, 101 Slone Building, Lexington, KY 40506-0053, USA;2. Auburn University, Department of Geology and Geography, 210 Petrie Hall, Auburn, AL 36849, USA;3. University of Oslo, Department of Geosciences, Postboks 1047 Blindern, 0316 Oslo, Norway |
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| Abstract: | Partial melting and retrogression have been recognized in high-grade metapelites of the Tatra Mountains, Western Carpathians (Slovakia) related to exhumation during Variscan orogeny. Reaction textures and phase equilibria define a clockwise P-T path. The prograde metamorphism from ca 600 °C and 9–10 kbar to >700 °C at 11–12 kbar resulted in muscovite dehydration-melting in the kyanite stability field. Further heating at decreasing pressure led to the dehydration-melting of biotite at >750 °C in the sillimanite stability field. This was followed by nearly isothermal decompression down to 4–5 kbar, producing cordierite and some additional melt. Later nearly isobaric cooling led to melt crystallization and sub-solidus retrogression. CO2-N2 fluids (5–30 mol. % N2) were generated at pressures <6 kbar by interaction between the melt-derived water and graphite at oxidizing conditions. |
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