Details of Award
NERC Reference : NE/B506086/1
Anelastic and plastic behaviour of minerals at high-P and T studied by novel portable high-P/T stress cell for synchroton and neutron diffraction.
Grant Award
- Principal Investigator:
- Professor S Redfern, University of Cambridge, Earth Sciences
- Co-Investigator:
- Professor MT Dove, Queen Mary University of London, Physics
- Grant held at:
- University of Cambridge, Earth Sciences
- Science Area:
- Earth
- Overall Classification:
- Earth
- ENRIs:
- Environmental Risks and Hazards
- Science Topics:
- Properties Of Earth Materials
- Abstract:
- The quantitative study of the rheological properties of minerals under the conditions of the Earth's mantle has been limited by the technical difficulties associated with carrying out accurate measurements of stress and strain while applying high containing pressures as well as temperature to mineral and rock samples Recently, Wang et al (2003) described a novel variant of the DIA multi-anvil apparatus capable of applying controlled differential stress to samples held at high pressure, for use at a synchrotron radiation source. While this apparatus offers one way forward, it must be built and run at the synchrotron beam line, mainly due to the very large loading frame and scale of the apparatus. his limited in the range of strains it can apply, and in the rather slow time response of the system to applied stress. Here, we propose a development of the small and portable Paris-Edinburgh loading frame, building on our existing programme of work, in which controlled shear stresses will be applied between opposed anvils, allowing high-pressure high-temperature measurements of samples subjected to a wide range of strain regimes This will allow the study of rheological phenomena in situ by synchrotron and neutron diffraction methods. We shall apply the method to the study of anelasticity in olivine, allowing the time-resolved measurement of grain boundary relaxation in olivine at high temperature and pressure, including the pressure-dependence of such relaxation. The shear stresses applied to pyroxenes will allow the first measurements of martensitic transformation in rock-forming minerals at the conditions of Earth's mantle, and the pressure dependence of oxygen-vacancy-mediated anelasticity in perovskite and elastic softening due to order-disorder in spinet will be determined, allowing us to both determine the activation volumes of such processes, and ascertain their relative importance for models of mantle rheology.
- NERC Reference:
- NE/B506086/1
- Grant Stage:
- Completed
- Scheme:
- Capital Equipment Pre FEC
- Grant Status:
- Closed
- Programme:
- Capital Equipment
This grant award has a total value of £249,133
FDAB - Financial Details (Award breakdown by headings)
| Total - Staff | Total - T&S | Total - Other Costs | Total - Indirect Costs | Total - Equipment |
|---|---|---|---|---|
| £111,037 | £6,864 | £20,426 | £51,077 | £59,729 |
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