Other
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.3173d&link_type=abstract
In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 3. (A77-34651 15-91) New York, Pergamon
Other
5
Electrical Resistivity, Lunar Temperature, Pyroxenes, Selenography, Thermal Mapping, Apollo Flights, Magnetometers, Temperature Effects
Scientific paper
The electrical conductivity of orthopyroxene from Bamle, Norway has been measured in the 100, 010, and 001 directions to 1550 C. Measurements were made at 0.5 GPa in an Ar-CO2-CO mixture. The resulting oxygen fugacity allowed orthopyroxene to be maintained within its stability field at this pressure to at least 1400 C. Multiple measurements in each direction were reversible with no hysteresis to 1400 C. At higher temperatures, electrical conductivity became time-dependent and irreversible, presumably due to phase transformation(s). Assuming that orthopyroxene is the dominant conductor in the moon, a selenotherm may be derived from these data and from the electrical conductivity vs depth observations of Apollo magnetometer experiments. This selenotherm approaches the solidus within about 150 C at 400 to 600 km. These results agree with previous selenotherms based on extrapolated sigma data for pyroxene.
Duba A.
Heard H. C.
Schock R. N.
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