Determination of Rock Thermal Properties

The purpose of this project was to determine, for 10 rock types, the viscosity and electrical conductivity as a function of temperature in the molten state, and the heat of vaporization. The rock types are (1) St. Cloud gray granodiorite (charcoal granite), (2) Westerly granite, (3) Barre granite, (...

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Bibliographic Details
Main Authors: Bacon, James F, Russell, Sidney, Carstens, Jeffrey P
Format: Report
Language:English
Subjects:
BASALT
CARBON DIOXIDE LASERS
ELECTRICAL CONDUCTIVITY
GABBRO
Geology, Geochemistry and Mineralogy
GRANITE
GRANODIORITE
HEAT OF VAPORIZATION
HEATING
LASER BEAMS
QUARTZITE
RHYOLITE
ROCK
SANDSTONE
THERMAL PROPERTIES
VISCOSITY
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Summary:The purpose of this project was to determine, for 10 rock types, the viscosity and electrical conductivity as a function of temperature in the molten state, and the heat of vaporization. The rock types are (1) St. Cloud gray granodiorite (charcoal granite), (2) Westerly granite, (3) Barre granite, (4) Dresser basalt, (5) Sioux quartzite, (6) Bera sandstone, (7) Tholeiitic basalt, (8) Duluth gabbro, (9) Newberry ryholite, and (10) granodiorite. Viscosity and electrical resistivity measurements were made at temperatures as high as 2200C, for all rocks except the quartizite. Using the resistivity data, an approximation of the thermal conductivity of the molten rocks was made using the Wiedemann-Franz-Lorenz law, which gives a relationship between the electrical and thermal conductivity. Heat of vaporization of the rocks was measured by vaporizing samples with a CO2 laser beam. Samples were vaporized in a calorimeter, which measures the partition of input energy among rock heating, rock vaporization, and other losses.