Abstract
A search is conducted to detect nanocrystals in a sample of apogranitic pseudotachylite, which is a product of extremely strong crushing of granite in a seismogenic fault. Raman spectroscopy revealed nanocrystals of quartz measuring approximately 17 to 25 nm and low-temperature albite ranging from 8 to 30 nm. The crystallographic cell in the nanocrystals is deformed. The internal stresses which might have been responsible for these deformations vary from approximately −300 (compression) to +480 (tension) MPa. It is found that after having been exposed to high pressure (1 GPa) and temperature (470–500°C for 10 minutes and 550–600°C for 16 minutes), the nanocrystals of quartz reduced in size to ≈10 nm, and the nanocrystals of albite, to 13 nm. At the same time, the level of tension in the lattice spacing of quartz increased.
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Original Russian Text © G.A. Sobolev, Yu. S.Genshaft, S.M. Kireenkova, Yu.A. Morozov, A.I. Smul’skaya, V.I. Vettegren’, V.B. Kulik, 2011, published in Fizika Zemli, 2011, No. 6, pp. 3–12.
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Sobolev, G.A., Genshaft, Y.S., Kireenkova, S.M. et al. Effects of high pressure and temperature on the properties of nanocrystals in rocks: Evidences from Raman spectroscopy. Izv., Phys. Solid Earth 47, 465–474 (2011). https://doi.org/10.1134/S1069351311050053
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DOI: https://doi.org/10.1134/S1069351311050053