******************************************************************** From: Georg Zellmer <gzellmer@xxxxxxxxxxxxxxxxxxx> ******************************************************************** Dear all, This is a reminder of the upcoming IAVCEI abstract deadline on 1 April. You are invited to submit relevant abstracts to our session on *bimodal magmatism (1f)*. For abstract submission, follow this link: http://www.iavcei2008.hi.is/page/I08-absub The following are our invited speakers: Ilya Bindemann, University of Oregon, USA Dennis Geist, University of Idaho, USA Anita Grunder, Oregon State University, USA Bill Hart, Miami University, USA Mike Mawby, Durham University, UK Martin Streck, Portland State University, USA Yoshihiko Tamura, JAMSTEC, Japan Session description: Compositionally bimodal magmatism occurs at many sites of volcanic activity across a wide variety of tectonic and crustal settings, taking a range of styles, forms and relative volumetric proportions. Although in Iceland, the combined effects of divergent plate boundary and hot spot volcanism have produced a thick basaltic crust, there are a number of very good examples of bimodal volcanism, with rare eruptions of intermediate composition. Further, large volumes of silicic and basaltic magmatism are typically associated with rifted continental regions as well as large igneous provinces (continental flood basalt provinces and volcanic rifted margins). There are several fundamental questions related to how evolved magmas are created from potentially mafic source compositions (e.g., at oceanic hot-spot settings), the duration of the operating petrogenetic processes, and why felsic volcanism is common in some areas but absent in others. The aim of this session is to integrate volcanological, geochemical and geophysical constraints to advance our understanding of bimodal magmatism in Iceland and elsewhere, and specifically to 1) decipher the processes by which silicic magmas are generated, erupted and emplaced; 2) integrate the silicic and basaltic magmatic records to improve our understanding of the tectono-volcanic evolution of volcanic provinces; and 3) utilize silicic and bimodal volcano-stratigraphy as a record of the changing thermal-compositional characteristics of the crust during the igneous events. We encourage all contributions that may elucidate the processes that are responsible for the frequently encountered bimodality of igneous rocks. We are looking forward to seeing you in Iceland! Georg Zellmer, Institute of Earth Sciences, Academia Sinica, Taipei, gzellmer@xxxxxxxxxxxxxxxxxxx <mailto:gzellmer@xxxxxxxxxxxxxxxxxxx> Ken Rubin, University of Hawaii, krubin@xxxxxxxxxx <mailto:krubin@xxxxxxxxxx> Ingrid Ukstins Peate, University of Iowa, ingrid-peate@xxxxxxxxx <mailto:ingrid-peate@xxxxxxxxx> Scott Bryan, Kingston University, S.Bryan@xxxxxxxxxxxxxx <mailto:S.Bryan@xxxxxxxxxxxxxx> ============================================================== 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. ==============================================================
