OxTalks will soon move to the new Halo platform and will become 'Oxford Events.' There will be a need for an OxTalks freeze. This was previously planned for Friday 14th November – a new date will be shared as soon as it is available (full details will be available on the Staff Gateway).
In the meantime, the OxTalks site will remain active and events will continue to be published.
If staff have any questions about the Oxford Events launch, please contact halo@digital.ox.ac.uk
Geodynamic models have long modelled plumes originating from the bottom of the mantle. From this perspective, hot-spot magmatism provides a sample of the deepest mantle and potentially might carry evidence of on-going chemical exchange from core to mantle. Implicating protracted core-mantle interaction from the geochemistry of hot-spot magmas has been a sporadically popular notion over the last fifty years. In the last decade, unradiogenic values of 182W/184W have been reported in some hot-spot lavas, which provides perhaps the most convincing evidence of leakage from core to mantle. In this talk, I will assess this idea against alternative theories to account for unradiogenic 182W/184W in oceanic basalts and explore its implications for the longer term evolution of the mantle.
