Volcanological session at 2012 Goldschmidt conference in Montreal, June 24-29, Abstract deadline- February 1
From: Georg Zellmer <gzellmer@xxxxxxxxxxxxxxxxxxx>
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6f. Volatiles and their role in petrogenetic, intrusive and eruptive processes in subduction zones
Co-convenors:
Georg Zellmer (Academia Sinica-Taiwan) - gzellmer@xxxxxxxxxxxxxxxxxxx
Susanne Straub (Lamont-Doherty Earth Observatory) - smstraub@xxxxxxxxxxxxxxxxx
Marie Edmonds (University of Cambridge, UK) - me201@xxxxxxxxx
Jon Blundy (University of Bristol, UK) - Jon.Blundy@xxxxxxxxxxxxx
The volatile cycle at subduction zones is a key to the processes involved in the petrogenesis, ascent, storage, and eruption of arc magmas. Volatiles (H2O, CO2, Li, B, F, Cl, S) control the flux of slab components into the mantle wedge, are responsible for melt generation through lowering the solidi of the involved materials, and determine the crystallizing phase assemblages in the overriding crust as well as influencing redox conditions. During magma transport and storage, degassing may induce rapid crystallization and stalling of magmas at depth, to form viscous crystal mushes and plutonic bodies. On the other hand, volatiles carried within ascending melts may also play a role in driving the remobilization and subsequent eruption of previously degassed and stalled intrusives. Finally, the rate and extent of degassing during magma decompression, and its effects on magma rheology, control eruption style and the occurrence and environmental impacts of explosive arc volcanism.
The volatile cycle and mass budget associated with subduction zones has changed through geological time and varies spatially in modern subduction zones. We invite all contributions that elucidate and quantify such variations and their effects on the magmatic and volcanic processes operating in modern and ancient arcs, as well as their implications for subduction zone geochemical budgets. We welcome studies involving experimental petrology, melt and fluid inclusion work, mineral hygrometry and analysis of water in nominally anhydrous minerals, direct measurements of volatiles in gases at active arc volcanoes, combinations of such methods, and any other techniques that may provide insights into this broad topic.
keynotes TBA
--
Dr. Georg F. Zellmer
Associate Research Fellow
Institute of Earth Sciences
Academia Sinica
128 Academia Road, Sec. 2
Nankang
Taipei 11529
Taiwan, ROC
Phone: +886-2-2783-9910 ext. 602
Fax: +886-2-2783-9871
Web: www.earth.sinica.edu.tw/~gzellmer
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