The latter may have originated as dispersed parts of ancient mantle plumes
similar to a modern plume responsible for the formation of the intraplate Bowie Seamount.
HARD EVIDENCE In the 1960s, scientists first conceived of mantle plumes
as long cylinders of buoyant rock that gradually flatten and spread into mushroom shapes as the molten masses rise through the mantle.
do not exist and hot-spot trails are seen as the result of propagating cracks in the lithosphere.
1998, Detection of mantle plumes
in the lower mantle by diffraction tomography: Hawaii: Earth and Planetary Science Letters, v.
2002, Extraterrestrial influences on mantle plume
activity: Earth and Planetary Science Letters, v.
88 Ga dyke, the NW-trending Pickle Crow dyke [#8c] crossing the interior of western Superior Province provides a link between the Animikie Basin and Thompson Belt magmatic activity, and may suggest a mantle plume
model for the western part of the 1.
According to their theory, the breakup of continents is directly linked with mantle plumes
Most important, perhaps, has been the overall shift in thinking away from general geology and economics and towards tectonics, with much of the volcanic activity east of the Cascade Mountains now being attributed to hot spots or mantle plumes
Venus hosts at least nine volcanic hot spots, or mantle plumes
, similar to the plumes thought to power the Hawaiian island chain, Smrekar and colleagues suggested in Science last year.
Other topics of the 21 papers include the formation of Martian river valleys by impacts, oceanic island basalts and mantle plumes
, frictional melting processes in planetary materials, spatial patterns in isotopic biogeochemistry, and glacial earthquakes in Greenland and Antarctica.
Hart is a geologist and isotope geochemist whose recent research has focused on the origin of hot spots and mantle plumes
and on the dynamics and evolution of the deep Earth.
In their analysis of recent scientific findings, Rampino and Prokoph observe that mantle plumes
coincide with cyclical surface changes, suggesting that the plumes themselves may be cyclical in nature.