***************************************************************** From: Georg Zellmer <gzellmer@xxxxxxxxxxxxxxxxxxx> ***************************************************************** Dear Colleagues, We would like to draw your attention to session 1-f "Bimodal magmatism: Integrating volcanological, geochemical and geophysical constraints on petrogenetic processes" (http://www.iavcei2008.hi.is/page/I08-SYM1#1-f) at the IAVCEI 2008 General Assembly in Reykjavik, Iceland, on 17-22 August 2008, and invite you to contribute: 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. 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. Best wishes, Georg Zellmer 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. ==============================================================
