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SUMMARY:Tracking the Earth's Mantle Through Space and Time - Dr Tiffany Ba
 rry\, University of Leicester
DTSTART:20211108T180000Z
DTEND:20211108T190000Z
UID:TALK164389@talks.cam.ac.uk
CONTACT:Eloise Matthews
DESCRIPTION:Viscosity measurements for the upper mantle imply that on a la
 rge-scale\, over geological periods of time\, the upper mantle should be a
  relatively well-mixed reservoir within the Earth. However\, ocean-scaled 
 geochemical differences across the upper mantle have been known since the 
 1980’s\, with the identification of isotopic anomalies such as the DUPAL
  anomaly and SOPAL. Furthermore\, isotopic characteristics of depleted\, I
 ndian Ocean mid-ocean-ridge-basalts (MORB)\, which is often synonymous wit
 h the DUPAL anomaly\, have been documented in Neo-Tethys and Paleo-Tethys 
 MORB prior even to the formation of the Indian Ocean\, suggesting that per
 haps the upper mantle is not so well mixed as we might anticipate. However
 \, it is not clear how isotopic anomalies could persist in the upper mantl
 e through successive plate re-organisations given the 100-1000’s million
 s of years of radiogenic ingrowth necessary to generate differences in dep
 leted mantle composition. I will explore this question using 3D spherical 
 numerical mantle circulation models embedded with geological paleo-tectoni
 c reconstructions.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences\, Downing S
 ite
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