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SUMMARY:Thermal models of dyke intrusion during development of Continent-O
 cean Transition - Katherine Daniels
DTSTART:20130523T120000Z
DTEND:20130523T130000Z
UID:TALK45400@talks.cam.ac.uk
CONTACT:Yves Moussallam
DESCRIPTION:A consensus has emerged in recent years from a variety of geos
 cientific disciplines that extension during continental rifting is achieve
 d only partly by plate stretching: dyke intrusion also plays an important 
 role. Magma intrusion can accommodate extension at lower yield stresses th
 an are required to extend thick\, strong\, unmodified continental lithosph
 ere mechanically\, thereby aiding the breakup process. Dyke intrusion is a
 lso expected to thermally modify the rheology of the extending plate\, but
  the extent of its influence and the timescales over which it operates are
  poorly understood.\n\nTo address this issue\, a numerical solution to the
  heat flow equation is developed here to quantify the thermal effects of d
 yke intrusion on the continental crust during rifting. Finite difference m
 odels demonstrate that magmatic extension rate exerts a first order contro
 l on crustal thermal structure.Once dyke intrusion supersedes faulting and
  stretching as the principal extensional mechanism the crust will heat and
  weaken rapidly (<<1 Ma). The thermal models are benchmarked against a pri
 ori constraints on crustal structure and dyke intrusion episodes in Ethiop
 ia.\n
LOCATION:Harker II\, Geology Department
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