Hello Folks, We would like to invite you to submit an abstract to the hybrid 2021 Goldschmidt meeting Session 5G: The Role of Halogens, Sulfur, H2O, and CO2 in Volcanic and Plutonic Systems (A Session in Honor of Jim Webster). https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/2072 <https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/2072> https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi <https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi> Session description: Volatile species (Halogens, sulfur, H2O, and CO2) have a profound effect on volcanic and plutonic systems ranging from the origin of the magma through to the style of the eruption, and/or their interaction with the surrounding county rock. This session will parallel Jim’s career, which focused broadly on petrologic investigations of volatile-bearing igneous systems using both field and experimental approaches. Halogens, sulfur, CO2, and H2O are significant components of volcanic gases. Halogens exert a significant control on magma behavior, ore-metal deposits, and the composition of hydrothermal fluids. Recent advances of our knowledge of halogen repositories and the factors controlling their bulk and isotope distributions allow addressing magmatic differentiation and volatile exsolution, volcanic monitoring, crustal and mantle metasomatism, ore metal transfer, fluid reservoir contamination, and fluid mixing or mineral-melt-fluid partitioning. As an experimental petrologist, Jim contributed to our understanding of volatile processes in magmas and how the minerals that crystalize from these magmas can inform us about volatiles. Jim combined experimental research with petrographic studies of natural systems to understand the role of volatiles in igneous systems through the study of their mineral chemistry (e.g. apatite and micas) and melt inclusions. In the case of volcanic systems, Jim’s work also included studies of outgassing during eruptions and subsurface volcanic processes. This session will focus on the effects of dissolved volatiles on the origin, evolution, emplacement, and eruption of volatile-bearing magmas. We encourage anyone working on such systems as well as apatite and micas as halogen-bearing minerals to contribute to the session. The abstract submission deadline is 26 February (23:59 CET) https://2021.goldschmidt.info/goldschmidt/2021/cfp.cgi <https://2021.goldschmidt.info/goldschmidt/2021/cfp.cgi> Please note there is also a special collection in honor of Jim at American Mineralogist. Submissions for this collection is ongoing and papers will be published as they are accepted. Sincerely yours, Justin Filiberto (jfiliberto@lpi.usra.edu <mailto:jfiliberto@lpi.usra.edu>), Anne-Sophie Bouvier (anne-sophie.bouvier@unil.ch <mailto:anne-sophie.bouvier@unil.ch>), Hélène Balcone-Boissard (helene.balcone_boissard@sorbonne-universite.fr <mailto:helene.balcone_boissard@sorbonne-universite.fr>), Daniel Harlov Daniel Harlov Section 3.6 Chemistry and Physics of Earth Materials Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ Stiftung des öff. Rechts Land Brandenburg Telegrafenberg D-14473 Potsdam FR Germany international tel +49 (331) 288-1456 international fax +49 (331) 288-1402 email: dharlov@gfz-potsdam.de <mailto:dharlov@gfz-potsdam.de> http://www.gfz-potsdam.de/en/staff/daniel-harlov/ <http://www.gfz-potsdam.de/en/staff/daniel-harlov/> http://www.springer.com/in/book/9783642283932 http://www.springer.com/in/book/9783319616650 "If you cannot write well, you cannot think well; and if you cannot think well, others will think for you." George Orwell “ Math, Science, History, unravelling the Mystery, that all started with the Big Bang! “ opening credits to the Big Bang Theory sitcom.