Water and its influence on the lithosphere–asthenosphere boundary

David H. Green (), William O. Hibberson, István Kovács and Anja Rosenthal
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David H. Green: School of Earth Sciences and Centre for Ore Deposit Studies, University of Tasmania
William O. Hibberson: Research School of Earth Sciences, The Australian National University
István Kovács: Research School of Earth Sciences, The Australian National University
Anja Rosenthal: Research School of Earth Sciences, The Australian National University

Nature, 2010, vol. 467, issue 7314, 448-451

Abstract: Water in the upper mantle The presence of water in the Earth's mantle dramatically lowers the temperature for melting, but the magnitude of the effect is currently disputed. Green et al. have used a novel experimental approach to examine the role of water in the upper mantle at pressures of up to 6 gigapascals — equivalent to a depth of 190 kilometres. They find that the instability of the hydrous mineral pargasite at depths greater than 90–100 km causes a sharp drop in the water-storage capacity of a fertile upper-mantle mineralogy and, accordingly, a sharp drop in the material's solidus temperature. They conclude that this effect may define Earth's lithosphere–asthenosphere boundary.

Date: 2010
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DOI: 10.1038/nature09369

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