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Water solubility and diffusivity in olivine: its role in planetary tectonics

Published online by Cambridge University Press:  05 July 2018

K. Regenauer-Lieb*
Affiliation:
Institut für Geophysik, ETH Zürich Hönggerberg HPP, 8093 Zürich, Switzerland
T. Kohl
Affiliation:
Institut für Geophysik, ETH Zürich Hönggerberg HPP, 8093 Zürich, Switzerland

Abstract

New constraints on the thermodynamic equation of state of water and the predicted water fugacity dependence of OH-solubility at elevated P-T conditions along with its influence on dislocation dynamics in olivine are reviewed. Water is shown to control the style of tectonics of a planetary lithosphere by switching on highly localized weak faulting instead of a broad, slow creeping flow. The transition occurs above a water concentration of 200 ppm H/Si. We argue that this changeover in style of tectonics has important implications for the mechanics of subduction and for plate tectonics in general. Efficient recycling of water is only given if the top strong part of the lithosphere can fail and be dragged down into the mantle in a steady way. Due to different starting conditions and differences in accretion through planetismals, Venus may have never have reached a water content above 200 ppm H/Si in the upper mantle while Mars would have now left the plate tectonic regime due to fast cooling.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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Footnotes

Current address: CSIRO Mining and Exploration, 26 Dick Perry Avenue, Technology Park, Perth, WA 6151, Australia

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