Mathematics – Logic
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789...30e&link_type=abstract
In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 30-32 (SEE N93-14288 04-91)
Mathematics
Logic
Convective Heat Transfer, Coronas, Geological Faults, Heat Transmission, Planetary Geology, Planetary Temperature, Tectonics, Venus (Planet), Venus Surface, Volcanoes, Volcanology, Dynamic Response, Elastic Plates, Estimates, Temperature Distribution, Temperature Gradients
Scientific paper
Knowledge of the thermal structure of a planet is vital to a thorough understanding of its general scheme of tectonics. Since no direct measurements of heat flow or thermal gradient are available for Venus, most estimates have been derived from theoretical considerations or by analog with the Earth. The flexural response of the lithosphere to applied loads is sensitive to regional thermal structure. Under the assumption that the yield strength as a function of depth can be specified, the temperature gradient can be inferred from the effective elastic plate thickness. Previous estimates of the effective elastic plate thickness of Venus range from 11-18 km for the foredeep north of Uorsar Rupes to 30-60 km for the annular troughs around several coronae. Thermal gradients inferred for these regions are 14-23 K km-1 and 4-9 K km-1 respectively. In this study, we apply the same techniques to investigate the uplifted flanks of an extensional rift. Hypotheses for the origin of uplifted rift flanks on Earth include lateral transport of heat from the center of the rift, vertical transport of heat by small-scale convection, differential thinning of the lithosphere, dynamical uplift, and isostatic response to mechanical uploading of the lithosphere. The 1st hypothesis is considered the dominant contributor to terrestrial rift flanks lacking evidence for volcanic activity, particularly for rift structures that are no longer active. In this study, we model the uplifted flanks of a venusian rift as the flexural response to a vertical end load.
Evans Susan A.
Simons Mark
Solomon Sean C.
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