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SUMMARY:Modelling magma migration through the continental lithosphere: the
  importance of multiple pulses and channelized flow. - Boris Kaus (Johanne
 s Gutenberg-Universität Mainz\; University of Southern California)
DTSTART:20160607T134500Z
DTEND:20160607T143000Z
UID:TALK66376@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Oliver Jagoutz (MIT)\, Wenrong Cao (Rice University)\, Scott P
 aterson (University of Southern California)\, Tobias Keller (Oxford)\,&nbs
 p\;Lisa Rummel (Mainz)<br><br>Whereas a considerable body of works exists 
 on the physics of melt extraction from the hot mantle at mid-oceanic ridge
 s\, melt migration through the colder continental lithosphere is less well
  understood. As 500 million people live in the vicinity of active volcanoe
 s and the most dangerous volcanoes are located on continental lithosphere\
 , it however remains an important topic for the Earth Sciences. &nbsp\; Hi
 gh precision U-Pb dating of batholiths seems to suggest that many of them 
 are formed by an amalgamation of smaller melt pulses. Since those pulses p
 resumably rose at approximately the same location of the lithosphere\, it 
 is likely that this changed (and likely weakened) the mechanical state of 
 the lithosphere with time. Here\, I will discuss thermo-mechanical models 
 of melt propagation through the cold mantle lithosphere to address the con
 sequences of this mechanical weakening on melt transport. In addition\, I 
 will discuss (simple) models of granitic melt intrusion within the contine
 ntal crust in which diking is incorporated in a parameterized manner and i
 n which melt is emplaced in many pulses. The results of&nbsp\; these model
 s suggests that that both pulses and localized mechanical weakening is of 
 key importance for magma transport. They also show that in other to unders
 tand magmatic transport systems\, it is insufficient to only focus on the 
 batholiths itself or on the batholith-volcano connection. Instead\, magmat
 ic systems are lithospheric-scale systems\, and should be modelled as such
 .&nbsp\; In this respect\, many unresolved questions remain and I will dis
 cuss some of those.<br><br>
LOCATION:Seminar Room 1\, Newton Institute
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