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Title: Thermal diffusivity of igneous rocks at elevated pressure and temperature

Abstract

Thermal diffusivity measurements of seven igneous rocks were made to temperatures of 400 /sup 0/C and pressures of 200 MPa. The measuring method was based on the concept of cylindrical symmetry and periodic heat pulses. The seven rocks measured were Westerly (Rhode Island) granite, Climax Stock (Nevada) quartz monzonite, Pomona (Washington) basalt, Atikokan (Ontario, Canada) granite, Creighton (Ontario, Canada) gabbro, East Bull Lake (Ontario, Canada) gabbro, and Stripa (Sweden) granite. The diffusivity of all the rocks showed a positive linear dependence on inverse temperature and, excluding the East Bull Lake gabbro, showed a linear dependence on quartz content. (Quartz content varied from 0 to 31% by volume.) Diffusivity in all cases rose or remained steady with increasing confining pressure. The pressure effect was strongest at lowest pressures and vanished by levels between 10 and 100 MPa, depending on rock type. The pressure effect (measured as a percentage change in diffusivity) is stronger in the four rocks of granite composition than in the three of basaltic composition. Our results agree well with existing thermal diffusivity measurements at atmospheric pressure.

Authors:
; ;
Publication Date:
Research Org.:
University of California, Lawrence Livermore National Laboratory, Livermore, California
OSTI Identifier:
5515857
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 92:B11
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; IGNEOUS ROCKS; THERMAL DIFFUSIVITY; CHEMICAL COMPOSITION; HIGH TEMPERATURE; PRESSURE DEPENDENCE; THERMAL CONDUCTIVITY; VERY HIGH PRESSURE; PHYSICAL PROPERTIES; ROCKS; THERMODYNAMIC PROPERTIES; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989)

Citation Formats

Durham, W B, Mirkovich, V V, and Heard, H C. Thermal diffusivity of igneous rocks at elevated pressure and temperature. United States: N. p., 1987. Web. doi:10.1029/JB092iB11p11615.
Durham, W B, Mirkovich, V V, & Heard, H C. Thermal diffusivity of igneous rocks at elevated pressure and temperature. United States. https://doi.org/10.1029/JB092iB11p11615
Durham, W B, Mirkovich, V V, and Heard, H C. 1987. "Thermal diffusivity of igneous rocks at elevated pressure and temperature". United States. https://doi.org/10.1029/JB092iB11p11615.
@article{osti_5515857,
title = {Thermal diffusivity of igneous rocks at elevated pressure and temperature},
author = {Durham, W B and Mirkovich, V V and Heard, H C},
abstractNote = {Thermal diffusivity measurements of seven igneous rocks were made to temperatures of 400 /sup 0/C and pressures of 200 MPa. The measuring method was based on the concept of cylindrical symmetry and periodic heat pulses. The seven rocks measured were Westerly (Rhode Island) granite, Climax Stock (Nevada) quartz monzonite, Pomona (Washington) basalt, Atikokan (Ontario, Canada) granite, Creighton (Ontario, Canada) gabbro, East Bull Lake (Ontario, Canada) gabbro, and Stripa (Sweden) granite. The diffusivity of all the rocks showed a positive linear dependence on inverse temperature and, excluding the East Bull Lake gabbro, showed a linear dependence on quartz content. (Quartz content varied from 0 to 31% by volume.) Diffusivity in all cases rose or remained steady with increasing confining pressure. The pressure effect was strongest at lowest pressures and vanished by levels between 10 and 100 MPa, depending on rock type. The pressure effect (measured as a percentage change in diffusivity) is stronger in the four rocks of granite composition than in the three of basaltic composition. Our results agree well with existing thermal diffusivity measurements at atmospheric pressure.},
doi = {10.1029/JB092iB11p11615},
url = {https://www.osti.gov/biblio/5515857}, journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 92:B11,
place = {United States},
year = {Sat Oct 10 00:00:00 EDT 1987},
month = {Sat Oct 10 00:00:00 EDT 1987}
}