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March 6, 2014

Earth core mantle.jpg


Dr Ian Wood

Senior Lecturer, Department of Earth Sciences, UCL

Tuesday 11 March - 4.00 pm

Basement, WEB 05, the previous Mineralogy Seminar Room


If we are to understand large-scale Earth processes such as the formation and evolution of the core, the magnetic field, and the transfer of heat through the mantle, it is essential that we know the physical properties of the minerals present in the Earth’s deep interior, i.e. in its lower mantle and core. However, as the core-mantle boundary in the Earth lies at a depth of nearly 3000 km, at which point the pressure and temperature are around 1.3 million atmospheres and 4000 K, direct experimentation is extremely challenging. A more effective route for determining the structures and properties of these deep-Earth phases is, therefore, to combine X-ray and neutron diffraction studies with computer simulations of both actual and low-pressure “analogue” systems. In this talk I shall concentrate on recent work on the FeSi – NiSi system, a possible inner-core component of terrestrial planets, and on studies of ABX3 analogues of MgSiO3 perovskite, with particular relevance to the perovskite to post-perovskite phase transition that occurs in MgSiO3 just above the Earth’s core-mantle boundary.


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