Solid Earth Sciences(S)
Session Sub-categoryScience of the Earth's Interior & Tectonophysics
Session IDS-IT19
TitleMineral-melt-fluid interaction and COHN volatile speciation in Earth and planetary
Short TitleCOHN volatiles the Earth and planets
Main ConvenerNameBjorn Mysen
AffiliationGeophysical Laboratory, Carnegie Inst. Washington
Co-Convener 1NameEiji Ohtani
AffiliationDepartment of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University
Co-Convener 2NameJun Tsuchiya
AffiliationGeodynamics Research Center, Ehime University
Session LanguageEE
ScopeThis 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.
Presentation FormatOral and Poster presentation
Invited Authors
  • Daniel James Frost (Bayerisches Geoinstitut, University of Bayreuth)
  • Zhu Mao (University of Science and Technology of China)
Time Presentation No Title Presenter Abstract
Oral Presentation May 20 AM1
09:00 - 09:15 SIT19-01The effect of pressure and oxygen fugacity on the ferric-ferrous ratio of silicate meltsDaniel James Frost Abstract
09:15 - 09:30 SIT19-02Melting phase relation of Fe-bearing PhD up to the uppermost lower mantle and transportation of H2O to the deep EarthChaowen Xu Abstract
09:30 - 09:45 SIT19-03Fate of slab water in arc–backarc–stagnant slab and beyondJun-Ichi Kimura Abstract
09:45 - 10:00 SIT19-04Locating hydrogen in lower mantle transition zone hydrous ringwooditeNarangoo Purevjav Abstract
10:00 - 10:15 SIT19-05Experimental constraints on the dihedral angle between olivine and multicomponent aqueous fluids in the upper mantle conditionsYongsheng HUANG Abstract
10:15 - 10:30 SIT19-06Dehydration kinetics of talc in the system MgO-SiO2-H2O probed in-situ by vibrational spectroscopy at high pressure and high temperatureShigeru Yamashita Abstract
Oral Presentation May 20 AM2
10:45 - 11:00 SIT19-07Elasticity of superhydrous phase B at the mantle temperature and pressure: Implications for 800-km discontinuity and water flow into lower mantleZhongqing Wu Abstract
11:00 - 11:15 SIT19-08Incorporation of nitrogen into the lower-mantle minerals under high pressure and high temperature
-Transportation and storage of nitrogen in the deep earth-
Ko Fukuyama Abstract
11:15 - 11:30 SIT19-09Determination of 15N/14N ratios in reduced silicate glasses using Raman spectroscopy.Celia Dalou Abstract
11:30 - 11:45 SIT19-10Phase Stability and Thermal Equation of State of δ-AlOOH: Implication for Origin of the ULVZZhu Mao Abstract
11:45 - 12:00 SIT19-11First principles investigation of the vibrational properties of hydrous wadsleyite and hydrous ringwooditeJun Tsuchiya Abstract
12:00 - 12:15 SIT19-12Computational study of the quantum fluctuation on the δ-AlOOH crystal structureTsutomu Kawatsu Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 20 Core Time
SIT19-P01 Chemical reactions between Fe and H2O up to megabar pressures and implications for water storage in the Earth’s mantle and core Liang Yuan Abstract
SIT19-P02 Fast water diffusion in silica glass Minami Kuroda Abstract