Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96..301b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Jan. 10, 1991, p. 301-315.
Physics
11
Gravity Anomalies, Pioneer Venus 1 Spacecraft, Planetary Gravitation, Planetary Mantles, Venus Surface, Lithosphere, Magellan Project (Nasa), Planetary Geology, Plates (Tectonics), Topography
Scientific paper
Pioneer Venus orbiter (PVO) gravity profiles over Aphrodite Terra are compared with profiles predicted from models of thermal isostasy, mantle convection, and Airy compensation. Topography profiles across Aphrodite are compared to model spreading-ridge profiles in order to further assess this model. Airy compensation depths and convection-layer thicknesses are greater under eastern Aphrodite than western Aphrodite. Compensation depths in the east are greater than most estimates of lithospheric thickness, suggesting that this part of the ridge is dynamically supported. In parts of western Aphrodite, the spreading-ridge model gravity provides a better fit to the data than either Airy compensation or mantle convection. Best-fit spreading rates are between 0.3 and 1.6 cm/yr. Airy compensation and mantle convection cannot be distinguished in most places using only PVO data.
Black Martin T.
McAdoo David C.
Zuber Maria T.
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