Interaction of rising and sinking mantle plumes

Details Interaction of rising and sinking mantle plumes Interaction of rising and sinking mantle plumes

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..455s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 3, p. 455-458

Physics

22

Tectonophysics: Dynamics, Convection Currents And Mantle Plumes

Scientific paper

The frequency of plume formation in fully-developed thermal convection is determined experimentally. Because the fluid has a temperature-dependent viscosity, the cold and hot thermal boundary layers have different thicknesses and viscosities. As a result, plumes are released from these layers with different frequencies. There also appears to be a direct temporal interaction between the cold and hot boundary layers. In particular, whereas there is a single frequency for cold plume formation, hot plumes form with multiple frequencies, one of which is similar to the frequency of cold plumes. The measurements thus suggest that cold sinking ``plumes'' may induce hot rising plumes.

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