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Super deep rock formation and upper mantle move in concert
March 06, 2002European Highlight from Geophysical Research Letters (GRL)
In a finding that contradicts conventional wisdom, results from a
new technique to survey the super-deep upper mantle of southern
Africa show that underground volcanic rock shifted with the
lithospheric plates in the area. Previously, researchers thought that
the motion of the two objects was independent. Vinnik and Farra
["Subcratonic low-velocity layer and flood basalts"] analyzed
seismic recordings down to 360 kilometers [220 miles] and were
able to create images of two areas exposed to similar basalt
emplacement more than 200 million years ago. They then
compared the known motions of the upper mantle's plates to the
location of the two rock formations and found that the formation
seemed to have migrated along with the plates. The novel
technique used shear waves converted to compression mode to
examine the low-velocity layer of the craton, waves that are often
distorted or too weak for accurate signal detection. The observation
indicates that the mantle in these regions is quite viscous relative to
the convecting upper mantle.
Lev Vinnik, Institute of Physics of the Earth, Moscow, Russia;
Veronique Farra, Institut de Pysique du Globe de Paris, Paris,
France.
American Geophysical Union (AGU)
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