5-5-5-5-5-5-5-5-5-5-5-5-5-5 From: Daniel Harlov <dharlov@xxxxxxxxxxxxxx> Dear colleagues, We would like to draw your attention to the topical session *T36. Experimental and Petrologic Investigation of Halogens, Sulfur, and Other Volatile Species in Igneous Systems: In Honor of Jim Webster *at https://community.geosociety.org/gsa2020/home. We anticipate an interactive session with talks, posters, and group discussion. Abstract deadline is August 4 (https://gsa.confex.com/gsa/2020AM/cfp.cgi). Early Registration deadline is September 21 ( https://community.geosociety.org/gsa2020/registration). The virtual online GSA meeting will be October 26 - 30. Please do not hesitate to contact us with questions Justin and Dan *Leaders: Justin Filberto and Daniel Harlov* *Description: *This session is dedicated to Jim Webster who devoted his professional career, both in the lab and in the field, to a broad study of halogens, sulfur, and other volatile species in igneous environments. *Invited Speakers: Juliane Gross (Rutgers University), Francis McCubbin (NASA JSC Houston), **Alexander Iveson (Durham University)* *Rationale: *This session will parallel Jimâ??s career focusing on volatiles (Halogens, Sulfur, Water, and other volatile species) in igneous environments from both field or experimental approaches. Jim Webster devoted his professional career, both in the lab and in the field, to a broad study of halogens, sulfur, and other volatile species in igneous environments including plutonic, subvolcanic, and volcanic processes. As an experimental petrologist Jim contributed to our understanding of volatile processes in igneous melts and what minerals from these melts, such as apatite and micas, can tell us about these processes. In the field Jim focused on understanding the role of volatiles in volcanic plutonic systems in part through the study of apatite mineral chemistry and melt inclusions and how this related to the genesis and evolution of the original magmatic systems. In the case of volcanic systems this also included studies of outgassing during eruptions and subsurface volcanic processes. A special issue of American Mineralogist is currently receiving dedicated to this session and Jimâ??s work. *In addition to and in conjunction with the session:* Justin Filberto and I have organized and are currently co-editing a thematic issue in American Mineralogist in memory of Jim Webster for 2020 - 2021. Experimental and Petrologic Investigation of Halogens, Sulfur, and Other Volatile Species in Igneous Systems: In Honor of Jim Webster Jim Webster devoted his professional career, both in the lab and in the field, to a broad study of halogens, sulfur, and other volatile species in igneous environments, which included plutonic, subvolcanic, and volcanic processes. As an experimental petrologist Jim contributed to our understanding of volatile processes in igneous melts and what minerals from these melts, such as apatite and micas, can tell us about these processes. In the field Jim focused on understanding the role of volatiles in volcanic systems and in plutonic systems, such as granites, in part through the study of apatite mineral chemistry and melt inclusions and how this related to the genesis and evolution of the original magmatic systems. In the case of volcanic systems, this also included studies of outgassing during eruptions and subsurface volcanic processes. For this special volume of American Mineralogist in honor of Jim, we invite all researchers interested in the role of volatiles in igneous processes - geochemical, mineralogical, and petrological to contribute their studies. This includes both field studies and lab-based studies including experimental petrology. Papers on apatite- or mica-based research of any sort are especially welcome. Submission dates are any time from now up through 2021 and may be extended further depending on the interest expressed for this thematic issue. When submitting your article to American Mineralogist follow the regular procedure and then choose from the Special Section in the menu - â?? Experimental and Petrologic Investigation of Halogens, Sulfur, and Other Volatile Species in Igneous Systems in Honor of Jim Webster â??. Your article will then become part of the thematic collection. Other than that - submission procedure, peer review, etc. is the same as for any other paper submitted to American Mineralogist. More information can be found here: http://www.minsocam.org/MSA/AmMin/special-collections.html . If you should have any questions regarding the suitability of your contribution to the thematic issue - please feel free to contact either Justin or me. 5-5-5-5-5-5-5-5-5-5-5-5-5-5 ============================================================== 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). 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