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SUMMARY:Life and times in the Cambrian and its stratigraphic constraints o
 n Himalayan geology\, tectonics\, and uplift history - Prof. Nigel Hughes\
 , University of California\, Riverside
DTSTART:20121023T153000Z
DTEND:20121023T163000Z
UID:TALK38982@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The advent of the Cambrian was pivotal in geological history \
 , and was associated with a major increase in both animal diversity and in
  magmatic activity in Gondwanaland. As a time of high stand\, Cambrian roc
 ks are widely represented worldwide\, but remain poorly known in some area
 s\, such as the Himalaya. The Himalaya is key to our understanding of proc
 esses associated\nwith continent-continent collision. Such understanding r
 elies on the\nrecognition of the major "lithotectonic zones" of the Himala
 ya which show\n fundamental differences in lithology\, geochemistry and pr
 ovenance. How do\nthese lithotectonic zones relate to the condition of the
  margin prior to\ncollision? This question is critical for understanding n
 ot only the history\nof the margin prior to collision\, but also to constr
 aining the uplift and\nerosional history since collision. By focusing on r
 ocks of a particular\nstratigraphic unit - the Cambrian System - along and
  across the Himalayan\nmargin\, we have shown original continuity of the m
 argin throughout the major\nlithotectonic zones of the Himalaya. Such a re
 sult raises questions about\nsome established ideas in Himalayan geology a
 nd may have implications for\nconsiderations of Neogene uplift history\, p
 articularly of that of the Lesser\nHimalaya. Our results also bear on envi
 ronmental changes taking place during the Cambrian\, and their possible ro
 le in guiding the Cambrian and Ordovician evolutionary radiations. 
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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