FT-IR Spectroscopic Investigation of Hydrous Components in Sillimanite from Eastern Ghat Granulite Belt, India |
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| Authors: | RV Karanth George Mathew TK Gundu Rao |
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| Institution: | aDepartment of Geology, M. S, University of Baroda, Vadodara - 390 002, India;bRegional Sophisticated Instrumentation Centre, IIT, Powai, Mumbai - 400 076, India |
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| Abstract: | FT-IR spectra of sillimanite samples from high grade regionally metamorphosed rocks belonging to the granulite terrain (amphibolite to pyroxene granulite facies) deciphers prominent OH features. Heating experiments indicate growth of prominent band at 3161cm−1. Heating above 1000°C all OH features disappear in intensity into broad features with slight shift of bands towards lower energies. Complete dehydration requires temperatures above 1000°C. Coexistence of boron and OH features are also observed in all sillimanite samples. The high temperature behaviour of sillimanite from the granulite terrain discerns that the hydrous species in sillimanite were incorporated much below 700°C, however, secondary hydration due to pegmatite activity, retrograde metamorphism and migmatisation is not ruled out. Thus a near anhydrous condition were probably not achieved during the granulite facies metamorphism in Eastern ghat granulite terrain. |
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| Keywords: | FT-IR Sillimanite hydrous boron granulite metamorphism |
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