Development of diapiric structures in the upper mantle due to phase transitions

Details Development of diapiric structures in the upper mantle due to phase transitions Development of diapiric structures in the upper mantle due to phase transitions

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252.1836l&link_type=abstract

Science (ISSN 0036-8075), vol. 252, June 28, 1991, p. 1836-1839. NASA-supported research.

Physics

49

Earth Mantle, Earth Planetary Structure, Phase Transformations, Volcanoes, Free Convection, Plumes, Solid State

Scientific paper

Solid-state phase transition in time-dependent mantle convection can induce diapiric flows in the upper mantle. When a deep mantle plume rises toward phase boundaries in the upper mantle, the changes in the local thermal buoyancy, local heat capacity, and latent heat associated with the phase change at a depth of 670 kilometers tend to pinch off the plume head from the feeding stem and form a diapir. This mechanism may explain episodic hot spot volcanism. The nature of the multiple phase boundaries at the boundary between the upper and lower mantle may control the fate of deep mantle plumes, allowing hot plumes to go through and retarding the tepid ones.

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