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A comparative analysis of the rock stressed state in the sections of SG-3 and KTB superdeep wells and in their vicinities
Abstract. We have reported here temperature dependence of electrical resistivity, heat capacity of natural tremolite up to 1300 K for the first time. The samples used in the present study, are natural tremolites from the core samples of the Kola Superdeep well (SG-3) from the depth of 12148 meters and a surface sample from Idegondanahalli, Karnataka, India. Both samples have witnessed identical peak metamorphic conditions. The electrical resistivity of the tremolite from the SG-3 is found to be 1.02?1011 Ohm.cm at 415 K, and decreases exponentially with the increase of temperature up to 903 K, where the electrical resistivity increases from 1.412?106 Ohm.cm to 3.158?107 Ohm.cm. The transition is interpreted as thermally induced decomposition of tremolite, as the transition in the temperature range 903 K to 963 K is found to be irreversible in their electrical resistivity behaviour. This phase transition is also observed at 1050 K in differential thermal analysis (DTA). Temperature dependence of heat capacity of tremolite up to 1300 K also confirmed the phase transition. The phase transition observed in the SG-3 sample has been compared with the thermal behaviour of a surface sample of tremolite from Idegondanahalli.
Printed reference: Savchenko S.N., Kozyrev A.A. A comparative analysis of the rock stressed state in the sections of SG-3 and KTB superdeep wells and in their vicinities // Vestnik of MSTU. 2007. V. 10, No 2. P. -.
Electronic reference: Savchenko S.N., Kozyrev A.A. A comparative analysis of the rock stressed state in the sections of SG-3 and KTB superdeep wells and in their vicinities // Vestnik of MSTU. 2007. V. 10, No 2. P. -. URL: http://vestnik.mstu.edu.ru/v10_2_n27/articles/25_savch.pdf.
