************************************************************* From: Sharon Allen <Sharon.Allen@xxxxxxxxxxx> ************************************************************* Dear Colleagues, For those working on explosive volcanism, we would like to draw your attention to the "Explosive volcanism" session 1-m (http://www.iavcei2008.hi.is/page/I08-SYM1#1-m) at the IAVCEI 2008 General Assembly in Reykjavik, Iceland, on 17-22 August 2008, and invite you to contribute: Explosive volcanism The ascent and eruption of magma is strongly influenced by processes of degassing, outgassing and microlite crystallization in volcanic conduits. Explosive eruptions are driven by the decompression of magmatic volatiles during ascent and/or by the sudden expansion of external water on contact with the hot magma. The fragments are driven into the atmosphere in eruption plumes and further transported through buoyancy driven convection and deposited as fallout or collapse to form ground-hugging pyroclastic gravity currents. Explosive eruptions occur at volcanoes with a range of compositions regardless of their tectonic setting, although the most explosive eruptions occur as a result of fast ascent rates in hydrous viscous magmas. This session will use vesicle, microtextural and lithofacies studies of the pyroclastic deposits or complementary decompression experiments, analog simulations and computational models to understand: (1) fragmentation mechanisms in explosive eruptions (2) transport and depositional processes of pyroclastic deposits The abstract submission deadline is 1 April 2008. Information on abstract submission and registration procedures can be found at http://www.iavcei2008.hi.is/page/I08-intro. Please contact any of the conveners if you have questions: Conveners: Bruce Houghton, School of Ocean & Earth Science & Technology, University of Hawaii at Manoa, USA, bhought@xxxxxxxxxxxxxxxx Jacopo Taddeucci, Istituto Nazionale di Geofisica e Vulcanologia, Dept. of Seismology and Tectonophysics, Italy, taddeucci@xxxxxxx Shinji Takarada, Geological Survey of Japan, AIST, JAPAN, s-takarada@xxxxxxxxxx Sharon Allen, University of Tasmania, Australia, Sharon.Allen@xxxxxxxxxxx Dr Sharon Allen Centre for Ore Deposit Research University of Tasmania Private Bag 79 Hobart Tasmania 7001 Australia ============================================================== 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. ==============================================================
