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SUMMARY:The TTG window and the formation of Earth’s earliest continental
  crust. - Richard White\, School of Earth and Environmental Sciences\, Uni
 versity of St Andrews
DTSTART:20240227T120000Z
DTEND:20240227T130000Z
UID:TALK210199@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:A large number of papers have been written on the processes re
 sponsible for the formation of the Earth's earliest continental crust.  Th
 ese range from plume-based processes\, through modern style plate tectonic
 s all the way through to formation from bombardment as the solar system pa
 ssed through galactic regions with high impact potential. Simultaneously\,
  numerous papers have Attempted to identify the melting sources for the ma
 gnetic suites that define early continental crust\, The Trondjhemite- Tona
 lite-Granodiorite suite. Despite the progress in these studies there remai
 ns considerable disagreement on sources and processes for TTG generation 
 – in part because of a tendency to try and identify a single process and
  a single source for all the earliest fragments of continental crust. In t
 his talk I will discuss a number of these issues and\, in particular\, whe
 ther or not a single source and single process is a geologically sensible 
 approach\, arguing instead that a number of different processes may operat
 e and may independently form crust that is sufficiently thick and buoyant 
 as to be preservable in the geological record.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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