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Thermochemical flows couple the Earth's inner core growth to mantle heterogeneity
 

Summary: LETTERS
Thermochemical flows couple the Earth's inner core
growth to mantle heterogeneity
Julien Aubert1
, Hagay Amit2
, Gauthier Hulot2
& Peter Olson3
Seismic waves sampling the top 100 km of the Earth's inner core
reveal that the eastern hemisphere (406 E1806 E) is seismically
faster1,2
, more isotropic2,3
and more attenuating4
than the western
hemisphere. The origin of this hemispherical dichotomy is a chal-
lenging problem for our understanding of the Earth as a system of
dynamically coupled layers. Previously, laboratory experiments
have established that thermal control from the lower mantle can
drastically affect fluid flow in the outer core5
, which in turn can
induce textural heterogeneity on the inner core solidification

  

Source: Amit, Hagay - Institut de Physique du Globe de Paris
Olson, Peter L. - Department of Earth and Planetary Sciences, Johns Hopkins University

 

Collections: Geosciences