1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 From: "Sirbescu, Monaliza Catalina" <sirbe1mc@xxxxxxxxx> 1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 Greetings! The Annual GSA meeting in Phoenix, Arizona, (22-25 September) is taking shape, and we have this topical session to offer: T21. Reading Igneous Textures The primary textures of igneous rocks reflect the environments in which their magmas solidify, which is usually not the same environment as at their sources. The multitude of igneous textures signifies that natural magmas approach the equilibrium state from conditions that may begin far from it, and they may be quenched before they achieve it. Consider that granite, porphyry, pegmatite, stockschieder, aplite, granophyre, rhyolite, elvan, vitrophyre, and obsidian are all textural variants of the same magma composition. For plutonic igneous rocks, there is the added uncertainty of the extent to which they preserve their original igneous character. Chemical tests of re-equilibration are important, but so is texture as a means of discerning subsolidus morphologic changes among crystals. Reading igneous textures is an important component of a petrologic study of process, and hence it is paramount to the application of chemical principles or methods that rely on the attainment of chemical equilibrium among phases in the system. This session, therefore, is an open call to anyone working on aspects of igneous texture, from nanometer to macroscopic scales, on the basis of field, laboratory, or numerical studies. All igneous rocks are included. Rebecca Lange (University of Michigan) and Michael D. Higgins (Université du Québec à Chicoutimi, Canada) will give invited presentations. The Mineralogical Society of America is a sponsor of this session. We hope you will join us in the Valley of the Sun to present your work on a topic that is much in need of discussion. The GSA is posting meeting information at this site: http://www.geosociety.org/GSA/Events/Annual_Meeting/GSA/Events/2019info.aspx The abstract submission window opened April 1 and closes 11:59 PM (23:59) Pacific Time on June 25. Our topical session is T21, and you can submit an abstract from a link in that notice. We will remind you of this session toward the end of May. Thank you for your consideration. Conveners: David London, University of Oklahoma Monaliza Sirbescu, Central Michigan University ============================================================== 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. ============================================================== ------------------------------
