Japan Geoscience Union Meeting 2018

Session information

[EE] Oral

S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Tectonophysics

[S-IT19] Mineral-melt-fluid interaction and COHN volatile speciation in Earth and planetary

Sun. May 20, 2018 10:45 AM - 12:15 PM 201B (2F International Conference Hall, Makuhari Messe)

convener:Bjorn Mysen(Geophysical Laboratory, Carnegie Inst. Washington), Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), Jun Tsuchiya(愛媛大学地球深部ダイナミクス研究センター), Chairperson:Ohtani Eiji(Tohoku University)

This session addresses how volatile species in the COHN system affect the geochemistry, mineralogy, and geophysics of the Earth and planetary interior from natural observations, laboratory experiments, and numerical modeling in the temperature, pressure, and oxygen activity range from the early stage of the planet formation to the present.
The COHN volatiles can be critical in zones of mantle upwelling and melting, in the fluid-enriched subduction zones, in the mantle transition zone, in the lower mantle to the core-mantle boundary, and in Earth and planetary cores. However, COHN volatiles affect properties and processes differently depending on their oxidation state, and terrestrial and planetary redox conditions vary in time and space. For example, properties of the upper mantle, which is often oxidizing and comprise CO2, H2O, and N2, will differ from those of the deeper mantle where more reducing conditions may stabilize H2O, H2, simple hydrocarbon, ammonia, hydrides, carbides, and nitrides. This difference is because reduced C- and N-bearing species may substitute for oxygen in silicate melts and minerals, whereas C- and N-bearing oxidizing species, such as CO2, H2O, and N2 do not.
This session will address how volatiles control the dynamic processes of Earth and planets, governed by their geophysical and geochemical properties, from geological and laboratory observations coupled with numerical modeling. The topics include (1) Stability relations, chemical and physical properties of crystalline, molten and fluid phases, and partitioning of COHN volatiles among these phases, (2) Stable isotopes, and their fractionation due to pressure and redox conditions, (3) Rheological properties of geomaterials, intergranular fluid, and fluid composition, (4) Seismicity and the influence of volatiles in various tectonic regions including subduction zones. (5) Effects of fluids and melts in numerical simulation of geo-tectonics.

11:00 AM - 11:15 AM

*Ko Fukuyama1, Hiroyuki Kagi1, Toru Inoue2,3, Toru Shinmei3, Sho Kakizawa3, Naoto Takahata4, Yuji Sano4 (1.Geochemical Research Center, Graduate School of Science, The University of Tokyo, 2.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 3.Geodynamics Research Center, Ehime University, 4.Atmosphere and Ocean Research Institute, The University of Tokyo)

11:15 AM - 11:30 AM

*Celia Dalou1, Evelyb Füri1, Marie-Camille Caumon2, Mickael Laumonier3 (1.CRPG, UMR 7358, CNRS-UL, 15 rue Notre Dame des Pauvres, 54501 Vandœuvre-lès-Nancy, France, 2.Université de Lorraine, CNRS, CREGU, GeoRessources Laboratory, BP 70239, F-54506 Vandœuvre-lès-Nancy, France, 3.Laboratoire Magmas et Volcans, Université Blaise Pascal-CNRS-IRD, Clermont Universite, 63178 Aubière, France)




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