ICE AGE STRIKES EARTH'S CORE AS MODELERS LOWER
TEMPERATURE ESTIMATE 1000 DEGREES
A DREAM MEME FOR HEARTLAND
AND THE CO2 COALITIONA cooler core for Earth
Brent Grocholski Science
The boundary between the liquid outer core and solid inner core provides a key checkpoint for understanding the temperature structure of Earth. However, determining the melting temperature of iron at a pressure more than 3 million times greater than atmospheric pressure is challenging.
Sinmyo et al. measured the melting temperature of iron at these extreme pressures using diamond anvil cells and found it to be 500 to 1000 kelvin lower than some previous estimates...
Earth and Planetary Science Letters, 510, 45 (2019).Melting curve of iron to 290 GPa determined in a
resistance-heated diamond-anvil cell
Author links open overlay panelRyosukeSinmyo,KeiHirose & Yasuo OhishiHighlightsMelting temperature of iron is 5500 K at ICB pressure.
Upper bound for the temperature at the CMB is 3760 K.
Such low present-day CMB temperature suggests that the lowermost mantle has avoided
global melting, at least since the early Proterozoic Eon.
