1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 From: colin.macpherson@xxxxxxxxxxxx 1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 ** Goldschmidt Session â?? 6g Pathways and Processes in Differentiation of Arc Magmatic Systems ** ## Convenors â?? Colin Macpherson, Christy Till, Lucy McGee ## Subduction zones host some of the planetâ??s most important magmatic systems, provide mineral and geothermal resources, and valuable, fertile land yet they are also responsible for devastating natural hazards. Furthermore, such systems are also sites of refinement, and potentially growth, of continental crust. Therefore, understanding the sources of magma, their pathways through the crust, and processes of differentiation are of major scientific and social importance. Achieving this understanding relies on knowledge of many factors including: the age, composition, and prior tectonic history of the overriding plate; the composition of primary magma arriving into the arc lithosphere; the rheologic and thermal profile of arc lithosphere; the evolving stress field associated with the convergent margin; the role of reactive pathways exploited by melts; and the longevity of the magmatic system(s). Each of these factors, which may also vary along strike, influences the pressure, temperature, oxygen fugacity, vapour saturation, and crustal contamination that affect particular magma batches emplaced into or through the arc lithosphere. Ultimately, these processes potentially impact, for better or worse, the communities around them. We invite submissions that explore the feedbacks and interactions between intrinsic and extrinsic properties of subduction zone magmas to understand their origin, pathways and differentiation. Petrological, geochemical, and geochronological studies of natural systems, and experimental and numerical simulations of magmatic systems are welcomed. We also encourage contributions that seek to relate both these approaches to the wider tectonic, metamorphic, and geophysical structure of convergent margins, and the societal impact of their volcanism. ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - http://www.volcano.si.edu/ IAVCEI - http://www.iavcei.org/ To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------
