Lithospheric thickness and mantle/lithosphere density contrast beneath Beta Rigio, Venus

Details Lithospheric thickness and mantle/lithosphere density contrast beneath Beta Rigio, Venus Lithospheric thickness and mantle/lithosphere density contrast beneath Beta Rigio, Venus

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..429m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 429-432

Physics

22

Geoids, Lithosphere, Planetary Geology, Planetary Mantles, Thickness, Topography, Venus (Planet), Volcanoes, Density Distribution, Regression Analysis, Volcanology

Scientific paper

The spatial variation of the geoid/topography ratio over the large Venusian volcanic highland Beta Regio is suggestive of thermal compensation, i.e., support of the highland's topography by lithospheric thinning. Both the thickness of the lithosphere and the density contrast at its base can be inferred from a quadratic regression of suitably filtered (600 km less than wavelength less than 4000 km) geoid vs. topography data. The regression yields a mean lithospheric thickness of 270 km and a density contrast of magnitude 2.5% to 3.0%. Simple isostatic balance of the long-wavelength topography at Beta Regio requires thinning of the lithosphere by 50-60% beneath the rise.

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