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SUMMARY:The story of Mt Everest: metamorphism\, deformation\, and the 1933
  summit attempt - Dr Dave Waters\, University of Oxford
DTSTART:20181030T120000Z
DTEND:20181030T130000Z
UID:TALK106645@talks.cam.ac.uk
CONTACT:Owen Weller
DESCRIPTION:The high-grade\, partially melted metamorphic core of the Hima
 laya formed at depth after the collision of India with Asia\, was extruded
  southwards at about 25 and 15 Myr ago\, and now forms a slab of crystalli
 ne rocks (the Greater Himalayan Sequence) along the full length of the Him
 alaya. It happens that its upper boundary\, a system of extensional faults
  and ductile shear zones (the South Tibetan Detachment System)\, passes th
 rough Mt Everest\, where the summit is of Ordovician limestone\, while the
  base camps are in granite and migmatitic gneiss. On the 1933 British Ever
 est Expedition\, L.R. Wager\, later Professor of Geology at Oxford Univers
 ity\, collected more than 60 samples across the transition in the Rongbuk 
 Valley and on Everest itself. After retracing his steps (in the virtual re
 alm) to relocate the samples\, I have combined structural and metamorphic 
 studies on them\, along with existing data\, to produce the most complete 
 account to date of the mechanism and timing of the ductile shear zone resp
 onsible for exhuming the Himalayan metamorphic core.
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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