Partitioning of potassium between iron and silicate at the core-mantle boundary

Details Partitioning of potassium between iron and silicate at the core-mantle boundary Partitioning of potassium between iron and silicate at the core-mantle boundary

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3308303h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 8, CiteID L08303

Physics

7

Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Tectonophysics: Heat Generation And Transport

Scientific paper

Chemical reactions and the partitioning of potassium between metallic iron and potassium-silicate were studied at the core-mantle boundary (CMB) condition, 2900 km deep in the Earth, in a laser-heated diamond-anvil cell (LHDAC). Analytical transmission electron microscope (ATEM) analysis of the recovered samples from 134 GPa and 3500 K, prepared with Focused Ion Beam (FIB) techniques, revealed significant dissolution of potassium (0.8 wt.%) into molten iron, indicating that the partition coefficient of potassium between iron and silicate is 0.15. Our results show that the Earth's core can contain 35 ppm total potassium, i.e., 4.1 × 10-3 ppm of 40K, which could serve as a heat source corresponding to 0.23 TW in the Earth's core.

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