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Science 29 March 1996:
Vol. 271. no. 5257, pp. 1841 - 1845
DOI: 10.1126/science.271.5257.1841
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Reports

Alpe Arami: A Peridotite Massif from Depths of More Than 300 Kilometers

Larissa Dobrzhinetskaya, Harry W. Green II, * Su Wang

The abundance of FeTiO3 and chromite precipitates in olivine of the Alpe Arami peridotite massif, Switzerland, requires a much higher solubility for highly charged cations than is found in mantle xenoliths from depths of 250 kilometers. Three previously unknown crystal structures of FeTiO3 were identified that indicate that the originally exsolved phase was the high-pressure perovskite polymorph of ilmenite, implying a minimum depth of origin of 300 kilometers. These observations, coupled with the unique lattice preferred orientation of olivine, further suggest that the original composition of olivine may reflect that of a precursor phase, perhaps wadsleyite, that is stable only at depths greater than 400 kilometers.

Institute of Geophysics and Planetary Physics and Department of Earth Sciences, University of California, Riverside, CA 92521, USA.
* To whom correspondence should be addressed.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Quantitative 3D measurement of ilmenite abundance in Alpe Arami olivine by confocal microscopy: Confirmation of high-pressure origin.
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Fossilized high pressure from the Earth's deep interior: The coesite-in-diamond barometer.
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