Mantle plumes control magnetic reversal frequency

Details Mantle plumes control magnetic reversal frequency Mantle plumes control magnetic reversal frequency

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..437l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 3-4, Dec. 1991, p. 437-447. Research supported by NSF.

Physics

106

Earth Mantle, Geodynamics, Geomagnetism, Paleomagnetism, Cretaceous Period, Earth Core, Earth Crust, Free Convection, Tectonics

Scientific paper

A sequence of events is adduced to prove the contention that mantle plumes control magnetic reversal frequency. Mantle plumes rise from the D-arcsec seismic layer just above the core/mantle boundary, thinning D arcsec to fuel the plumes. This increases core cooling by allowing heat to be conducted more rapidly across the core/mantle boundary. Outer core convective activity increases to restore the abnormal heat loss, causing a decrease in magnetic reversal frequency in accordance with the model predictions for both alpha-squared and alpha-omega dynamos. When core convective activity increases above a critical level, a magnetic superchron results. The pulse of plume activity that caused the Cretaceous superchron resulted in a minimum increase in core heat loss of about 1200 GW over the present-day level, which corresponds to an increase in the Joule heat production of about 120 GW within the core.

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