**************************************************************** Announcement - 2008 AGU fall meeting - VGP Special session V41- Volatile Diffusion and Degassing as Related to Crystal and Bubble Growth, Volcanic Gas Compositions, and Eruption Dynamics From: Nicole Metrich <nicole.metrich@xxxxxx> **************************************************************** Dear colleagues, We organize a VGP special session (V41) during the upcoming 2008 AGU fall meeting in San Francisco that complements a pre-meeting RiMG shortcourse on Minerals, Inclusions and Volcanic Processes. This session would bring together people working on melt inclusions, magma degassing and crystallization, diffusion and bubble growth and gas emissions. V41: Minerals, Inclusions and Volcanic Processes 5: Volatile Diffusion and Degassing as Related to Crystal and Bubble Growth, Volcanic Gas Compositions, and Eruption Dynamics Magma degassing and crystallization are two critical and associated volcanic processes that play a major role in volcanic eruption style. Volatile transport and loss are strongly dependent on crystal and bubble growth. Often, degassing through bubble growth, coalescence and transfer in the volcano conduits is not an equilibrium process, but a disequilibrium process partially controlled by diffusion of volatile components. These components can be fractionated during degassing, which is also partially controlled by their respective diffusivities. Modeling processes that control the volcanic gas emission chemistry at surface and volcanic eruption dynamics is a challenge to modern volcanology. This session will bring together physical, experimental and numerical studies that examine crystallization, degassing, diffusion and disequilibrium processes. Textural and chemical analysis of eruptive products, studies on melt inclusions, volatile diffusivity, crystal/bubble growth, and surface gas records are welcome. Important questions regarding (i) the relationship between vesiculation, crystallization, magma ascent rate and eruption style, (ii) the disequilibrium processes that result from differential diffusion during decompression, and (iii) bubble coalescence and permeability development and their importance in interpreting the gas chemistry at surface will be addressed. This session complements a pre-meeting RiMG shortcourse on Minerals, Inclusions and Volcanic Processes. We hope to meet you in SF Do not miss the deadline for submitting your abstract: 10 September 2008 Convener: Nicole Metrich Laboratoire Pierre Sue-CNRS-CEA Gif sur Yvette, FRA nicole.metrich@xxxxxx Nicole Lautze U.S. Geological Survey USA nlautze@xxxxxxxx Jon Blundy University of Bristol GBR jon.blundy@xxxxxxxxxxxxx Jon Castro Smithsonian Institution USA castroj@xxxxxx Helge Gonnermann SOEST, University of Hawaii USA helge@xxxxxxxxxx ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
