Implications for plastic flow in the deep mantle from modeling dislocations in MgSi[O.sub.3] minerals
Article Abstract:
An alternative is described for direct atomistic simulations based on the framework of the Peierls-Nabarro model and shown that in perovskite, plastic deformation is strongly influenced by the orthorhombic distortions of the unit cell. The analysis has indicated that shear transformation and dislocation activity has involved different slip planes ({110} or (010)), leading to different lattice preferred orientation (LPO).
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
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Pressure sensitivity of olivine slip systems and seismic anisotropy of Earth's upper mantle
Article Abstract:
The formation of the Earth's upper mantle is mainly composed of the mineral olivine and so it governs the mechanical behavior and seismic anisotropy. However, the demonstrations at increased temperatures and average pressure along with the huge information on distorted mantle rocks indicates that the mineral olivine in the upper mantle distorts the dislocation creep along with the significant [100] slip.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Dislocation creep in MgSio3 perovskite at conditions of the Earth's uppermost lower mantle
Article Abstract:
The deformation experiments performed under uppermost lower-mantle conditions on polycrystals of silicate perovskite with the enstatite MgSio3 composition are studied. It showed that under uppermost lower-mantle conditions, MgSio3 perovskite deforms by dislocation creep and may therefore contribute to producing seismic anisotropy in rocks at such depths.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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