Investigation of slickenside nanocrystals from seismic dislocation zone
Category: 16-4UDC 552.31; 543.424
G.A. Sobolev(1), V.I. Vettegren(2), V.V. Ruzhich(3), S.M. Kireenkova(1), A.I. Smulskaja(1), R.I. Mamalimov(2), V.B. Kulik(2)
(1) Schmidt Institute of Physics of the Earth RAS, Moscow, Russia
(2) Ioffe Institute RAS, Saint Petersburg, Russia
(3) Institute of the Earth's Crust of the Siberian Branch of the RAS, Irkutsk, Russia
Abstract. The structure of the slickenside on the surface of a porphyrite specimen was studied using Raman and infrared spectroscopy. The specimen was taken from the area of the extended Gobi-Altai seismic dislocation, created as a result of a catastrophic earthquake circa 350–250 million years ago in South Mongolia, near the Orok-Noor Lake. It was discovered that the slickenside contains epidote nanocrystals and water. It is asserted that such structure of the slickenside leads to reduction of the coefficient of friction and to creation of unstable stick-slip.
Keywords: slickenside, dislocation, nanocrystals, coefficient of friction.
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