Density profile of pyrolite under the lower mantle conditions

Geophysical Research Letters - Tập 36 Số 6 - 2009
A. Ricolleau1, Yingwei Fei1, Elizabeth Cottrell2,3, H. C. Watson1, Liwei Deng2,4, Li Zhang1, G. Fiquet5, Anne-Line Auzende5, Mathieu Roskosz6, G. Morard7,8, Vitali B. Prakapenka9
1Geophysical Laboratory, Carnegie Institution of Washington, Washington DC, USA
2Carnegie Institution of Washington, Geophysical Laboratory, Washington, DC, USA
3Smithsonian Institution Department of Mineral Sciences, National Museum of Natural History Washington DC USA
4Peking University School of Earth and Space Sciences Beijing China
5Institut de Physique du Globe de Paris IMPMC Paris France
6Laboratoire de Structure et Proprietes de l'Etat Solide Université des Sciences et Techniques de Lille Villeneuve d'Ascq France
7European Synchrotron Radiation Facility, Grenoble, France
8IMPMC Institut de Physique du Globe de Paris Paris France
9Center for Advanced Radiation Sources University of Chicago Argonne Illinois USA

Tóm tắt

The pyrolite model is one of the possible compositions of the Earth's lower mantle. The lower mantle's composition is generally modelled by comparing seismic observations with mineral physics data of possible lower mantle end‐member phases. Here, we report the compression behavior of a natural KLB‐1 peridotite (a representative composition of the pyrolite model) in a quasi‐hydrostatic environment at simultaneous high pressure (P) and temperature (T), covering the entire range of lower mantle P‐T conditions up to 112 GPa. This is the first experimentally determined density profile of pyrolite under the lower mantle conditions. The results allow us to directly compare the measured density of peridotite mantle along the geotherm with the Preliminary Reference Earth Model (PREM) derived from seismic observations, without extrapolation. The comparison shows significant mismatch between the two, which calls for a re‐evaluation of the PREM density model or a non‐pyrolite lower mantle composition.

Từ khóa


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Geophysical Research Letters

Tập 36 Số 6

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