Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle

Details Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...22..272g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 22, Issue 3-4, p. 272-276.

Physics

6

Scientific paper

New shock wave measurements of the optical absorption spectrum from 410 to 580 nm of 0.14 and 0.26 mole percent Fe2+-bearing MgO (synthetic periclase) have been carried out to pressures of 42 GPa, and demonstrate considerably lower opacities at short wavelengths than inferred from static high pressure measurements on more Fe2+-rich samples. Although the spectra obtained under dynamic pressure conditions demonstrate a marked increase in the absorption coefficient at 410 nm (e.g., from 0.3 to 0.65 cm-1 for 0.26 mole percent Fe2+), in qualitative agreement with the effect of pressure on more Fe2+-rich samples, the absolute values of the absorptivity coefficients observed are ~102 lower than those inferred from static high pressure spectral data for iron-rich materials probably containing relatively more ferric iron. The spectra for (Mg0.9, Fe0.1)O inferred from Mao and Bell's (1977) static results to 31 GPa imply that radiative thermal conductivity for the lower mantle (~3000 K) is effectively blocked by significant opacity in the optical range. When the present shock-wave results, for which the Fe3+ content is believed to be less than 5% of the total iron, are extrapolated to a typical mantle Fe2+ composition, temperatures of ~3000 K and pressure of 31 GPa, a significant radiative thermal conductivity, 4 J (s K m)-1 is calculated, implying that significant radiative thermal conductivity of the lower mantle may take place in Fe2+-depleted minerals under highly reducing conditions.

Affiliated with

Also associated with

No associations

Rating

Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1218134