Mathematics – Logic
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261..591c&link_type=abstract
Science (ISSN 0036-8075), vol. 261, no. 5121, p. 591-595.
Mathematics
Logic
36
Planetary Geology, Tectonics, Venus (Planet), Volcanology, Convection, Magellan Spacecraft (Nasa), Magma, Planetary Mantles, Venus, Volcanism, Tectonics, Concentration, Rifting, Upwelling, Flow, Mantle, Crust, Circulation, Distribution, Surface, Features, Origin, Formation, Anomalies, Dynamics, Patterns, Analysis, Density, Ridges, Fractures, Position (Location)
Scientific paper
Global analysis of Magellan image data indicates that a major concentration of volcanic centers covering about 40 percent of the surface of Venus occurs between the Beta, Atla, and Themis regions. Associated with this enhanced concentration are geological characteristics commonly interpreted as rifting and mantle upwelling. Interconnected low plains in an annulus around this concentration are characterized by crustal shortening and infrequent volcanic centers that may represent sites of mantle return flow and net downwelling. Together, these observations suggest the existence of relatively simple, large-scale patterns of mantle circulation similar to those associated with concentrations of intraplate volcanism on earth.
Aubele Jayne C.
Crumpler Larry S.
Head James W.
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