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SUMMARY:The lithospheric structure of Pangea - Professor Dan McKenzie (Uni
 versity of Cambridge)
DTSTART:20150313T130000Z
DTEND:20150313T133000Z
UID:TALK58435@talks.cam.ac.uk
CONTACT:Jack Wright
DESCRIPTION:Lithospheric thickness of continents\, obtained from Rayleigh 
 wave tomography\, is used to make maps of the lithospheric thickness of Pa
 ngea by reconstructing the continental arrangement in the Permian.  This a
 pproach assumes that lithosphere moves with the overlying continents\, and
  therefore that the arrangement of both can be obtained using the poles of
  rotation obtained from magnetic anomalies and fracture zones.  The result
 ing reconstruction shows that a contiguous arc of thick lithosphere underl
 ay eastern Pangea. Beneath the western convex side of this arc there is wi
 de belt of thinner lithosphere\, underlying what is believed to have been 
 the active margin\, here named the Pangeides.  On the inner side of the ar
 c is another large area of thin lithosphere beneath the Pan-African belts 
 of North Africa\nand Arabia.  The arc of thick lithosphere is crossed by b
 ands of slightly thinner lithosphere that lie beneath the Pan-African and 
 Brasiliano mobile belts of S. America\, Africa\, India\, Madagascar\, Arab
 ia and Antarctica. This geometry suggests that lithospheric thickness has 
 an important influence on continental deformation and accretion.
LOCATION:Tilley Lecture Theater\, Department of Earth Sciences
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