VOLCANO: Goldschmidt Session: Delamination and Downwellings: The Secondary Convection Systems in Orogens and at Cratonic Peripheries

[Jean-François Smekens <jsmekens@xxxxxxx>]

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Goldschmidt Session: Delamination and Downwellings: The Secondary Convection Systems in Orogens and at Cratonic Peripheries
From: Mary Reid <Mary.Reid@xxxxxxx>
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Alan Levander, Janne Blichert-Toft, Gene Humphreys, and I are organizing this session, at the geochemistry-geophysics interface, for the 2013 Goldschmidt Conference. Please consider submitting an abstract to this session and joining us in Florence.

Session 06d

http://goldschmidt.info/2013/program/programViewThemes

Delamination and Downwellings: The Secondary Convection Systems in Orogens and at Cratonic Peripheries

Keynote: Lindy Elkins-Tanton (Carnegie Institution)

Invited Speakers: Don Anderson, Mihai Ducea, Lang Farmer, and Greg Houseman

Results from large array seismology in the Americas and Eurasia as
 well as geodynamic modeling are determining the relationships between 
the Earth’s primary convection
 structures and smaller convection phenomena found within orogens and 
along their peripheries with the cratons. Geochemical evidence has long 
suggested that delamination / convective downwelling phenomena are 
responsible for a range of volcanic rock types,
 as well as both rapid uplift and orogenic collapse. Downwellings, if 
they involve the lower crust, can change crustal chemistry through time,
 and hence have been invoked as a means to remove the basaltic lower 
crust and drive the continental crust toward intermediate
 composition. At the peripheries of the orogenic belts various edge 
convection processes can destabilize adjacent Precambrian lithosphere. 
Within and at the edges of orogens existing lithosphere is involved in 
processes initiated by subduction that subsequently
 develop a physical life of their own. Correlation of both geochemical 
and surface structure signals with deep structures, and geodynamic 
understanding of these systems are still incomplete. We invite 
contributions that seek to improve our understanding of
 how geochemical and surface structure signals correlate with deep 
structures so as to bring new insights into the geodynamic workings of 
these systems.

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