A spatially fixed or at least internally rigid hotspot reference frame has been assumed for determining relative plate motions on Earth. Recent 1:5,000,000 scale mapping of Venus, a planet without terrestrial-style plate tectonics and ocean cover, reveals a systematic age and dimensional progression of corona-like arachnoids occurring in an uncinate chain. The nonrandom associations between arachnoids indicate they likely formed from a deep-seated mantle plume in a manner similar to terrestrial hotspot features. However, absence of expected convergent "plate" margin deformation suggests that the arachnoids are the surface expression of a migratory mantle plume beneath a stationary surface. If mantle plumes are not stationary on Venus, what if any are the implications for Earth?
|Title||A migratory mantle plume on Venus: Implications for Earth?|
|Authors||Mary G. Chapman, Randolph L. Kirk|
|Publication Subtype||Journal Article|
|Series Title||Journal of Geophysical Research B: Solid Earth|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Astrogeology Science Center|