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Dear Colleagues As Dave Pattison highlighted a little earlier in the summer, the GSA Annual Meeting in Baltimore this year will have a tremendous diversity of topical sessions dedicated to igneous and metamorphic petrology, as well as the inter-woven subjects of geochemistry, geochronology and tectonics (I have included details of a significant number of them below). I take this opportunity to invite you to consider submitting an abstract to session T167. T167. Metamorphic, Metasomatic, and Igneous Processes in the Mid- and Deep Continental Crust: Mechanisms and Processes That Impact Mass Transport and Rheology G. Christopher Koteas, Callum J. Hetherington GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Structural Geology and Tectonics Division; Mineralogical Society of America Showcase the integration of field studies, with textural and compositional analysis, and modeling of processes in continental crust: This session will highlight mechanisms and processes that produce, transport, and modify the deep continental crust. Petrology, Metamorphic | Petrology, Igneous | Structural Geology | Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37902> Our invited keynote speakers are: Whitney Behr (Uni. Texas, Austin) Jeffrey Marsh (Queens College, New York) Sean Regan (Uni. Massachusetts, Amherst) The deadline for the submission of abstracts is 11 August, and the abstract submission process may be accessed via this web-page: http://community.geosociety.org/gsa2015/science-careers/sessions Chris and I look forwards to convening a great session, as well as attending the tremendous range of related sessions being convened this year in Baltimore. Best regards Callum & Chris T162. A Lower Crustal Perspective on Magmatic Arc Processes Harold H. Stowell, Keith Klepeis, Joshua J. Schwartz GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division New data sets and improved tools set the stage for improved understanding of magmatic arc processes. We encourage submissions on magma generation, mass transfer, vertical crustal motion, relationships between deformation and magma emplacement, and metamorphism at mid- to lower-crustal levels. Petrology, Igneous | Petrology, Metamorphic | Tectonics/Tectonophysics | Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37883> T163. A Matter of Perspective: Integrating Macro- and Micro-Scale Evidence in Investigations of Magmatic Origins and Histories Tamara L. Carley, Tenley J. Banik, Lily L. Claiborne, Susanne McDowell GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Mineralogical Society of America; Geochemical Society; GSA Planetary Geology Division Together we will discuss magma: its origins, emplacement, and everything in between. We encourage dialog around creative integration of multi-scale evidence-from macro to micro perspectives. We also encourage broad participation, especially from early-career scientists. Petrology, Igneous | Volcanology | Geochemistry | Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37917> T164. Magmatic Processes in Peridotites: Connection to Tectonics Gordana Garapic, John Wakabayashi, Ulrich Faul Mineralogical Society of America; GSA Structural Geology and Tectonics Division; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Geochemical Society Melting and melt segregation influences the dynamics of partially molten mantle and the chemistry of melt and residuum. Submissions are welcome on all aspects of mantle melting, including experimental, field, and modeling studies. Petrology, Igneous | Volcanology | Tectonics/Tectonophysics Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37667> T165. Zen and Now: Honoring the Legacy of E-an Zen's Contributions to Geology Philip M. Piccoli, Jane M. Hammarstrom, H. Catherine Skinner, Guy L. Hovis GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Mineralogical Society of America; Geochemical Society This multidisciplinary session will honor the legacy of E-an Zen's contributions to geology. Petrology, Igneous | Mineralogy/Crystallography | Geoscience Education Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37595> T166. Metamorphic Petrology: New Approaches and Outcomes David R.M. Pattison, Matthew J. Kohn, Frank S. Spear, Bernardo Cesare GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Mineralogical Society of America; Mineralogical Association of Canada Rapid advances across the discipline of metamorphic petrology makes this a timely session. We wish to make the session as broadly appealing as possible, hence the general title. Petrology, Metamorphic | Geochemistry | Tectonics/Tectonophysics Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37998> T167. Metamorphic, Metasomatic, and Igneous Processes in the Mid- and Deep Continental Crust: Mechanisms and Processes That Impact Mass Transport and Rheology G. Christopher Koteas, Callum J. Hetherington GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Structural Geology and Tectonics Division; Mineralogical Society of America Showcase the integration of field studies, with textural and compositional analysis, and modeling of processes in continental crust: This session will highlight mechanisms and processes that produce, transport, and modify the deep continental crust. Petrology, Metamorphic | Petrology, Igneous | Structural Geology | Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37902> T168. Subduction, Fluids, Accessory Minerals, and Trace Elements: A Celebration of Sorena Sorensen's Career Barbara L. Dutrow, Sarah Penniston-Dorland, Virginia Sisson Mineralogical Society of America; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Geochemical Society This session will focus on metamorphosed subduction- related rocks including metamorphosed rocks of the subduction channel as well as arc crust, associated fluids, and minerals, cathodoluminescence, and trace elements that provide information about their petrogenesis. Petrology, Metamorphic | Geochemistry | Mineralogy/Crystallography | Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37746> T169. The Extremes of Metamorphism Victor Guevara, Chris Yakymchuk, Besim Dragovic, Omar Bartoli GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Structural Geology and Tectonics Division Extreme crustal metamorphism (UHT, UHP) informs us about fundamental Earth processes, but difficulties in quantifying such metamorphism remain. We encourage innovative approaches to understanding the hottest, deepest, shortest, longest, oldest, and youngest metamorphism on Earth. Petrology, Metamorphic | Tectonics/Tectonophysics | Structural Geology Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37543> T170. Experimental Investigations of Planetary Geologic Processes (Posters) Danielle Y. Wyrick, Paul K. Byrne GSA Planetary Geology Division; Geochemical Society; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division This session solicits abstracts regarding experimental and laboratory analyses of geologic processes and materials under the range of dynamic, kinematic, temperature, pressure, and chemical parameters found throughout the Solar System. Planetary Geology | Geochemistry | Geophysics/Geodynamics Submit an abstract to this session<https://gsa.confex.com/gsa/2015AM/top/papers/index.cgi?sessionid=37570> Callum J Hetherington Department of Geosciences Texas Tech University Box 41053 Lubbock, TX 79409-1053 USA