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SUMMARY:Tectonics and magmatism in collision zones\; observations from the
  Himalaya and Caucasus - Professor Nigel Harris (The Open University)
DTSTART:20111128T170000Z
DTEND:20111128T180000Z
UID:TALK33735@talks.cam.ac.uk
CONTACT:Ekbal
DESCRIPTION:The basic architecture of the Himalayan orogen is well establi
 shed. Two colliding continents have greatly thickened the continental crus
 t by both ductile and brittle deformation causing the metamorphic core of 
 the orogen to be being rapidly extruded southwards. Melting of this metamo
 rphic core is widespread\, resulting in migmatites and leucogranites distr
 ibuted across the breadth of the orogen. What is less clear is the role th
 is anatexis may have played in the extrusion process\, perhaps enhanced by
  rapid erosion at the surface due to the focused monsoon precipitation on 
 the southwards facing slopes of the Lesser Himalaya.\n\nIn this talk I tra
 ce the causes and mechanisms of melting and explore the role of anatexis i
 n the tectonic evolution of the Himalaya. I then draw comparisons with the
  Caucasus orogen that shares many similarities yet differs in one key resp
 ect: the highest Caucasian peaks are massive stratovolcanoes that are enti
 rely lacking in the Himalaya.\n
LOCATION:Harker Room 1\, Department of Earth Sciences
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