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Thermal Expansion Behavior of Igneous Rocks

Thermal Expansion Behavior of Igneous Rocks

EOS Transactions American Geophysical Union 55(4): 423-424

ISSN/ISBN: 0096-3941

DOI: 10.1016/0148-9062(74)91111-5

New experimental data on the thermal expansion of several igneous rocks over the range 25–550°C show that the observed thermal expansion is a function of crack porosity, heating rate, and previous maximum temperature as well as mineralogical composition and preferred crystal orientation. For heating rates if2°C/min and a maximum temperature 250°C; expansion curves are reproducible, may show a small hysteresis but no permanent strain, and the coefficient of thermal expansion () is approximately that calculated from the single crystal values of the constituent minerals. For highly cracked rocks is significantly less than the calculated value. For heating rates >2°C/min or T > 35°C, new cracks and hence permanent strain are produced in the sample and is systematically decreased. Recycling to the same temperature produces additional cracks until a steady state is reached after 2–5 cycles.

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Accession: 020478098

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