Towards a Better Understanding of the Fibrolite Problem: the Effect of Reaction Overstepping and Surface Energy Anisotropy |
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| Authors: | SASSI R; MAZZOLI C; SPIESS R; CESTER T |
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| Institution: | 1 DEPARTMENT OF MINERALOGY AND PETROLOGY, UNIVERSITY OF PADOVA, C.SO GARIBALDI 37, 35137 PADOVA, ITALY
2 IST. GEOSCIENZE GEORISORSE, CNR, C.SO GARIBALDI 37, 35137 PADOVA, ITALY |
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| Abstract: | Trachytes from the Euganean Hills District (Italy) contain metapeliticxenoliths that have been pyrometamorphosed during incorporationin the melt. In xenoliths containing sillimanite crystallizedduring a previous regional HT/LP metamorphism, fibrolite systematicallynucleates at the grain boundaries of sillimanite prisms andwithin plagioclase crystals. Ternary feldspar thermometry showsthat plagioclase in contact with sillimanite plots along the750°C solvus that reflects near-equilibrium conditions ofregional metamorphism. Plagioclase containing fibrolite plotscloser towards the 950°C solvus, reflecting the tendencyof plagioclase to re-equilibrate at high temperature duringpyrometamorphism by a fibrolite-forming reaction: |
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| Keywords: | : andalusite breakdown fibrolite pelitic xenoliths reaction overstepping sillimanite |
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