Goldschmidt 2015. Crustal recycling session
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18d: Crustal Recycling: Subduction, Delamination and Other Processes
Convenors: Mihai Ducea, Catherine Chauvel, Kaj HoernleKeynote: Julie Prytulak (Imperial College)
We have known for decades that continental material is recycled through subduction zones and in the past have primarily focused on recycling of subducted sediments. Increasingly the importance of continental crustal recycling through delamination/detachment and subduction erosion are being recognized as important processes affecting both the long-term evolution of continental crust and the mantle. The relative importance of these processes remains poorly constrained and the object of major debate in the scientific community. This session welcomes contributions that use petrological, geochemical and/or geophysical data to address fundamental questions concerning these processes, including large-scale questions such as: How important are these processes in creating and recycling continental crust? How much crustal material has been and is presently being recycled? Where are the key locations and what are the fundamental processes involved? How different is the composition of the recycled material from that of the average crust? Have the processes and scale of recycling changed through Earth history? How can we better constrain these recycling processes and the amounts of recycled material?
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