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Title:
Thermal stress tectonics on the satellites of Saturn and Uranus
Authors:
Hillier, John; Squyres, Steven W.
Affiliation:
AA(Cornell University, Ithaca, NY), AB(Cornell University, Ithaca, NY)
Publication:
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 25, 1991, p. 15,665-15,674. Research supported by NASA. (JGR Homepage)
Publication Date:
08/1991
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
Planetary Evolution, Saturn Satellites, Tectonics, Temperature Distribution, Uranus Satellites, Astronomical Models, Heat Transfer, Icy Satellites, Phase Transformations, Viscoelasticity
DOI:
10.1029/91JE01401
Bibliographic Code:
1991JGR....9615665H

Abstract

Thermal stress histories of the Saturnian and Uranian satellites are investigated. To this end, the thermal evolution of an icy satellite subjected to accretional and radiogenic heating, thermal conduction, and solid-state convection is modeled, and changes in the internal stress that occur during satellite evolution are examined. Results show that internal temperature changes that occur during normal evolution of many of the satellites of Saturn and Uranus can be expected to generate large extensional stresses in the satellites' outer regions. These stresses arise from three sources: (1) radiogenic warming, causing thermal expansion of materials in the satellite's deep interior; (2) radiogenic warming in larger satellites that can induce a phase transition from ice II to ice I and to produce a volume increase in the deep interior; and (3) accretional heating depositing heat in the satellite'e outer regions.
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