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SUMMARY:Structure and uplift history of the Transantarctic Mountains: a te
 st for convective instability in the upper mantle - Tim Stern - Victoria U
 niversity of Wellington
DTSTART:20221109T160000Z
DTEND:20221109T170000Z
UID:TALK180344@talks.cam.ac.uk
CONTACT:Yihe Xu
DESCRIPTION:The 3000 km long Transantarctic Mountains (TAM)\, and adjacent
  Wilkes Subglacial Basin\, is one of the more dramatic physiographic featu
 res of the planet. Explaining their origin and uplift has\, however\, been
  a challenge. These mountains have formed in a tensional environment\, and
  are up to 4500 m high. Recent seismic observation show that low shear-wav
 e speeds\, typical of asthenospheric mantle\, extends to shallow depths un
 der the edge of the TAM. In the Southern TAM this anomaly can be tracked 3
 50 km inboard of the edge of the TAM\, and in the Ross Sea sector 80 km un
 der the edge. \nHere we test the proposition that ductile\, small-scale\, 
 convective flow in the upper mantle can drive mountain building and coeval
  basin formation at the Earth’s surface. The TAM present an ideal locati
 on to carry out this test for two reasons: \n1. The unusually good set of 
 geological and geophysical data to constrain both crust-mantle structure a
 nd timing of uplift.\n2. Subduction has not occurred along this boundary s
 ince 500 Ma\, and thus we start with a clean slate. \n
LOCATION:Wolfson Lecture Theatre
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