Details of Award
NERC Reference : NER/B/S/2003/00188
What minerals control the Nb-Ta budget of subducted slabs?
Grant Award
- Principal Investigator:
- Professor JD Blundy, University of Bristol, Earth Sciences
- Grant held at:
- University of Bristol, Earth Sciences
- Science Area:
- Earth
- Overall Classification:
- Earth
- ENRIs:
- Natural Resource Management
- Global Change
- Environmental Risks and Hazards
- Science Topics:
- Properties Of Earth Materials
- Mantle & Core Processes
- Abstract:
- The distinctive Nb-Ta depletion of arc magmas and their typically subchondritic Nb/Ta ratios place constraints on the residual mineralogy in the subducted slab. The conventional interpretation is that residual rutile retains Nb and Ta, although it cannot cause significant reduction in Nb/Ta. Preliminary experiments in a simple system at 800?C and 2.2 GPa, show that Nb and Ta are compatible in garnet in equilibrium with an H2O-rich silicate melt and that the sense of Nb-Ta fractionation is consistent with a residue having superchondritic Nb/Ta. We ascribe this unusual behaviour to the very low, but realistic, temperature and high pressure of the experiments. We seek funding to explore a wider range of pressure, temperature and composition to establish how widespread this behaviour is, and whether it is observed in other slab minerals, such as amphibole, clinopyroxene and zoisite.
- NERC Reference:
- NER/B/S/2003/00188
- Grant Stage:
- Completed
- Scheme:
- Small Grants Pre FEC
- Grant Status:
- Closed
- Programme:
- Small Grants
This grant award has a total value of £30,300
FDAB - Financial Details (Award breakdown by headings)
| Total - Staff | Total - T&S | Total - Other Costs | Total - Indirect Costs |
|---|---|---|---|
| £16,845 | £968 | £4,740 | £7,749 |
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