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Absorption spectrum of shock-compressed Fe^(2+)-bearing MgO and the radiative conductivity of the lower mantle

Goto, Tsuneaki and Ahrens, Thomas J. and Rossman, George R. and Syono, Yasuhiko (1980) Absorption spectrum of shock-compressed Fe^(2+)-bearing MgO and the radiative conductivity of the lower mantle. Physics of the Earth and Planetary Interiors, 22 (3-4). pp. 277-288. ISSN 0031-9201. doi:10.1016/0031-9201(80)90044-8. https://resolver.caltech.edu/CaltechAUTHORS:20130416-114115408

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Abstract

New shock wave measurements of the optical absorption spectrum from 410 to 580 nm of 0.14 and 0.26 mole percent Fe^(2+)-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 Fe^(2+)-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 Fe^(2+)), in qualitative agreement with the effect of pressure on more Fe^(2+)-rich samples, the absolute values of the absorptivity coefficients observed are ∼10^2 lower than those inferred from static high pressure spectral data for iron-rich materials probably containing relatively more ferric iron. The spectra for (Mg_(0.9), Fe_(0.1))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 Fe^(3+) content is believed to be less than 5% of the total iron, are extrapolated to a typical mantle Fe^(2+) 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 Fe^(2+)-depleted minerals under highly reducing conditions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0031-9201(80)90044-8DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/0031920180900448PublisherUNSPECIFIED
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 1980 Elsevier Scientific Publishing Company. Received April 17, 1979; accepted for publication August 7, 1979. This research was supported under N.S.F. Grant EAR 75-15006A01 and the U.S.—Japan Cooperative Science Program (N.S.F. Grant INT 76-00573). We appreciate the experimental assistance of I. Jackson, H. Richeson, E. Gelle and R. Smith and the comments of H.K. Mao, P.M. Bell, R. Jeanloz and A. Duba.
Funders:
Funding AgencyGrant Number
NSFEAR 75-15006A01
U.S.-Japan Cooperative Science ProgramUNSPECIFIED
NSFINT 76-00573
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3194
Issue or Number:3-4
DOI:10.1016/0031-9201(80)90044-8
Record Number:CaltechAUTHORS:20130416-114115408
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130416-114115408
Official Citation:Tsuneaki Goto, Thomas J Ahrens, George R Rossman, Yasuhiko Syono, Absorption spectrum of shock-compressed Fe2+-bearing MgO and the radiative conductivity of the lower mantle, Physics of the Earth and Planetary Interiors, Volume 22, Issues 3–4, June 1980, Pages 277-288, ISSN 0031-9201, 10.1016/0031-9201(80)90044-8. (http://www.sciencedirect.com/science/article/pii/0031920180900448)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37971
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:16 Apr 2013 22:01
Last Modified:09 Nov 2021 23:32

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