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Melting of (Mg,Fe)_2SiO_4 at the Core-Mantle Boundary of the Earth

Holland, Kathleen G. and Ahrens, Thomas J. (1997) Melting of (Mg,Fe)_2SiO_4 at the Core-Mantle Boundary of the Earth. Science, 275 (5306). pp. 1623-1625. ISSN 0036-8075. doi:10.1126/science.275.5306.1623.

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The lower mantle of the Earth is believed to be largely composed of (Mg,Fe)O (magnesiowüstite) and (Mg,Fe)SiO_3 (perovskite). Radiative temperatures of single-crystal olivine [(Mg_(0.9),Fe_(0.1))_2SiO_4] decreased abruptly from 7040 ± 315 to 4300 ± 270 kelvin upon shock compression above 80 gigapascals. The data indicate that an upper bound to the solidus of the magnesiowüstite and perovskite assemblage at 4300 ± 270 kelvin is 130 ± 3 gigapascals. These conditions correspond to those for partial melting at the base of the mantle, as has been suggested occurs within the ultralow-velocity zone beneath the central Pacific.

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Alternate Title:Melting of (Mg,Fe)2SiO4 at the Core-Mantle Boundary of the Earth
Additional Information:© 1997 American Association for the Advancement of Science. Received 20 May 1996; accepted 24 January 1997. Research supported by NSF. Division of Geological and Planetary Science, California Institute of Technology, contribution 5672. We thank A. Scherer for the use of his sputtering apparatus, and G. Rossman for the use for of his optical transmission apparatus. We thank P. Wyllie, E. Ohtani, D. Stevenson, M. Gurnis, D. Helmberger, and the reviewers for comments. We also thank E. Gelle, M. Long, and A. Devora for their help in conducting the laboratory experiments.
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Caltech Division of Geological and Planetary Sciences5672
Issue or Number:5306
Record Number:CaltechAUTHORS:20141024-085011066
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Official Citation:Melting of (Mg,Fe)2SiO4 at the Core-Mantle Boundary of the Earth Kathleen G. Holland and Thomas J. Ahrens Science 14 March 1997: 275 (5306), 1623-1625. [DOI:10.1126/science.275.5306.1623]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50767
Deposited By: Tony Diaz
Deposited On:24 Oct 2014 18:28
Last Modified:10 Nov 2021 19:00

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