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Goldschmidt 2015. 20c “Fluxed and Stretched – Making New Crust”
From: Susanne Straub <smstraub@xxxxxxxxxxxxxxxxx>Goldschmidt 2015. 20c “Fluxed and Stretched – Making New Crust”
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Dear all -
we are organizing session 20c at Goldschmidt 2015 in Prague (August 16-21) entitled “Fluxed and Stretched – Making New Crust” (part of Theme 20: Mantle to Crust). The session covers crustal formation at mid-ocean ridges, continental rifts and arcs, and aims to examine the differences and commonalities between crust-forming processes in these different tectonic settings; the full session description is pasted below. We hope to see you there as contributors and/or in the audience.
Keynote: Mike Perfit
Invited Speakers: Tyrone Rooney (on Afar), Julian Pearce (on Izu Bonin - Mariana arc system)
Fluxed and Stretched – Making New Crust
Partial melts rise from the Earth's upper mantle to form variably differentiated silicate crust in a range of settings, including mid-ocean ridges, arcs and continental rifts. The elemental and mass transfer associated with partial melting is a key process in the chemical differentiation of solid Earth with implications for climate evolution. The composition of the silicate crust, its thickness, structure and evolution differ strongly in various geotectonic settings, but the causes of this diversity remains poorly understood. Does the compositional difference between crust produced in the various tectonic settings reflect different primary melts, or the complex intra crustal differentiation? Does a singular primary melt type exist or do primary melts encompass a broader range? What portion of the primary melt finally erupts? What are the accumulation rates and how and at which rates do crustal structure, thickness and composition evolve through time?
This session invites contributions that address all aspects of crustal formation at convergent and divergent plate boundaries and in intraplate settings. Case studies and conceptual approaches from all disciplines are welcome, including field studies, experimental petrology and geophysical approaches ranging from fluid dynamics to seismology. Studies that highlight differences and commonalities between the tectonic settings and those with a temporal perspective on crustal evolution are particularly encouraged.
Convenors: Susanne Straub, Johan Lissenberg, Philipp Brandl, Oliver Shorttle
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