Objective
The olivine-spinel transformation in the Earth's mantle is believed to have an important effect on the dynamics of subduction. It is possible that under P-T conditions of subducting slabs the transformation is kinetically inhibited. The possible metastable persistance of olivine to depths far below 400 km (which is a critical requirement in current models of deep-focus earthquakes) will be tested by determining the transformation kinetics experimentally .
Samples of mantle olivine are partially reacted at various P-T conditions (e.g. 18 GPa, 10000C) using a multianvil press. The microstructures of partially-reacted samples are characterised using optical and transmission electron microscopy. The time-dependence of the microtextures enables rates of nucleation and growth to be estimated as a function of P and T. Using appropriate kinetic rate equations, combined with thermal models, the experimental data will be used to quantify the depth of the olivine-spinel transformation in subduction zones.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences optics microscopy electron microscopy
- natural sciences earth and related environmental sciences geology seismology plate tectonics
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Coordinator
95440 BAYREUTH
Germany
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