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SUMMARY:The capture of the Tsangpo by the Brahmuputra River and rapid exhu
 mation of the Namche Barwa eastern syntaxis of the Himalaya:  testing the 
 erosion-tectonic feedback hypothesis by new  provenance methods using ruti
 le and zircon U-Pb in situ dating\, and im - Randy Parrish\, NIGL and Univ
 ersity of Leicester
DTSTART:20120124T163000Z
DTEND:20120124T173000Z
UID:TALK33783@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The easternmost Himalaya is a very interesting place\, geologi
 cally.  Many structures and tectonostratigraphic elements converge where t
 he structural trends bend sharply around the corner of NE India\, and the 
 Namche Barwa Massif is one of the earth’s most rapidly rising mountainou
 s areas.  The rapid rise there\, documented by low temperature thermochron
 ometers by several workers\, has been suggested to arise from a tectonic-e
 rosional feedback mechanism that followed headward erosion and capture of 
 the Tsangpo by the Brahmuputra River\, implying that one should be able to
  test this idea by dating capture and acceleration of uplift.  Other featu
 res relevant are the Neogene rise of the Shillong Plateau\, and continuing
  southerly translation of the Himalaya in Bhutan and Aranachal Pradesh ove
 r the Indian foreland.  This talk will describe this problem and the appli
 cation of innovative dating methods using zircon and rutile\, and how this
  new data sheds light on whether capture took place\, its age\, and when t
 he acceleration of exhumation started\, using an archive of sediments depo
 sited by the palaeo-Brahmaputra River in Bangladesh.  The data point to th
 e Quaternary as being a particular exciting time tectonically.  This appro
 ach’s power in  answering these questions will be illustrated by the new
  data\, and the advantages of using rutile in provenance studies will be d
 iscussed more generally.
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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