Please see below for sessions of interest to the GeoPRISMS Community, taking place at the 2018 Goldschmidt Conference in Boston (August 12-17). Abstracts are due on March 30. Additional information can be found at: https://goldschmidt.info/2018/
Please contact the GeoPRISMS Office at info@geoprisms.nineplanetsllc.com if you wish to advertise your session on the GeoPRISMS Listserv.
https://goldschmidt.info/2018/program/programViewThemes
03d: Multidisciplinary Insights into Subduction Zone Processes
Conveners: Joshua Garber, Paul Starr, Edward Inglis, Kevin Burton, Besim Dragovic
Keynote: Pierre Bouilhol (CRPG, Univ. Lorraine)
Understanding the physical and chemical processes that occur at subduction zones is of importance in constraining i) the mechanisms and forces that drive plate tectonics; ii) chemical exchange between surface and deep terrestrial reservoirs; iii) seismic and volcanic hazards on human timescales; and iv) the generation of arc crust. As such, understanding feedbacks between these processes is of paramount importance to elucidating subduction-zone dynamics. This session seeks to link aspects of subduction zone petrology and geochemistry and is concerned with placing better constraints on the temporal and spatial evolution of subduction-zone processes. We invite abstracts that are concerned with, but not limited to, geochemical cycling and interactions occurring within subduction zones (including elemental and isotopic studies); geochronological constraints on subduction zone metamorphism and its evolution; field-based studies of subduction zone terranes; rheological and petrological experiments; and numerical modeling of subduction zone dynamics. We are particularly interested in assessing feedbacks between different physical and chemical systematics, and reconciling disparate datasets or interpretations attained by distinct methodologies – including those on either a global or regional scale.
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03e: The Continents: Origin, Evolution and Interactions with Other ReservoirsConveners: Fang-Zhen Teng, Cin-Ty Lee, Sonja Aulbach, Xiaoming Liu
Keynote: Ming Tang (Rice University)
Much effort has been expended over the past thirty years in understanding the origin and evolution of the continents and their interactions with the atmosphere, hydrosphere, biosphere, and the mantle through time. This session will focus on the composition and structure of continental lithosphere (crust + mantle) in the context of its formation and evolution. Observational, experimental and theoretical insights from petrology, mineralogy, geochemistry, or geophysics are desired.
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03h: Experimenting and Geochemical Fingerprinting at Plate Boundaries: Quantification of Fluid–Melt–Residue Interplay at Ridges and Subduction Zones
Conveners: Yildirim Dilek, Véronique Le Roux, Ali Polat, Christy Till
Keynote: Andrew Matzen (University of Oxford)
Experimental petrology and field-based geochemical studies of igneous and metamorphic rocks from mid-ocean ridges and subduction zone settings show that both mantle peridotites and fluids–melts-crustal material that interact with them are compositionally variable due to slab-driven recycling mechanisms, presence of volatiles, oxidation mechanisms, diffusional processes, magma mixing, and rates–nature of upwelling processes. Therefore, magmas and mantle residues evolving in seafloor spreading environments at mid-ocean ridges and subduction zones are highly heterogeneous. Quantifying the interplay between fluid-melt and residue at plate boundaries through interdisciplinary investigations can help us better understand the mantle dynamics and its evolution through time. In this session we welcome contributions from experimental igneous–metamorphic studies and geochemical–isotopic investigations of peridotites/ophiolites at ridge settings and subduction zones that examine: trace element behavior and partitioning during melting and melt–fluid percolation, mode and nature of mantle depletion and enrichment, dehydration/re-hydration reactions in subducted slabs and their influence on mantle chemistry, scales and development of mantle heterogeneities, mechanisms of asthenospheric upwelling that facilitate melt and solid earth material transport to spreading centers, and records of crustal and mantle recycling processes through plate tectonics.
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04a: From Geochemistry to Geodynamics, Volatile Cycling and Planetary Habitability: Where, When, How?
Conveners: Megan Duncan, Matthew Weller
Keynote: David Catling (University of Washington)
Constraining the long-term cycle of volatiles (e.g., C, H, S, N, He, Xe, etc.) through planetary systems is critical toward understanding the evolution of any planet. Potential ingassing, outgassing, and regassing via deep and shallow recycling processes likely affected the early habitability of planets, such as the Earth, and continues to affect the present day atmospheric composition and magmatic processes. We invite submissions that use a combination of measurements of natural samples, experiments, and modeling to address some of the following questions: What, when, and how are volatiles recycled, lost, and stored? What are the signatures at the surface, e.g., isotopic measurements of arc volcanic rocks or gases? How has it changed over time, and what are its continued implications?
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04e: Magma Production and Emplacement Rates, Tempos, Timescales for Crustal Transport and Storage, and Eruptive Fluxes
Conveners: Christoph Beier, Michael Bizimis, Rebecca Lange, Stephen Turner
Keynote: Christy B. Till (Arizona State University)
There is increasing evidence that rates of melt generation in the mantle and rates of basalt emplacement into the crust vary not only between tectonic settings, but also within a single tectonic setting over time. How variations in the tempo of melt production and emplacement affect subsequent transport pathways through the crust, regions of storage, degree of differentiation, and eruptive fluxes are areas of active research. We encourage contributions that investigate the interplay between magmatic processes and timescales of magma evolution, including all aspects of magma production, emplacement rates, and how changes in tempo affect melt transport pathways and storage in the crust, degree of differentiation, and eruptive fluxes. Contributions that involve geochronology, mineral diffusion profiles, thermal modeling, crystal nucleation and growth rates, and other related topics are welcome.