moonkoon wrote:Re the chapter on "Carbon in the Core, Bin Chen and Jie Li"
... iron carbide, Fe7C3, provides a good match for the density and sound velocities of Earth's inner core under the relevant conditions.
... seismic waves called S waves travel through the inner core at about half the speed expected for most iron-rich alloys under relevant pressures.
Some researchers have attributed the S-wave velocities to the presence of liquid, calling into question the solidity of the inner core. In recent years, the presence of various light elements—including sulfur, carbon, silicon, oxygen and hydrogen—has been proposed to account for the density deficit of Earth's core.
... "This model challenges the conventional view that the Earth is highly depleted in carbon ...
http://ns.umich.edu/new/releases/22547- ... l-suggests
Note that this iron carbide model is just that, ...a model. The modelers acknowledge that it is provocative and speculative.
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