Outline of Session


Solid Earth Sciences(S) / Complex & General(CG) /  **International Session
S-CG14 Mixed volatiles in subduction zones; Physical and chemical properties and processes

Short title Mixed volatiles in subduction zones
Oral presentation
May 25 AM2 (12:00 - 12:45) 303 Bjorn Mysen 
May 25 PM1 (14:15 - 16:00) 303 Bjorn Mysen  / Dapeng Zhao 
May 25 PM2 (16:15 - 18:00) 303 Eiji Ohtani 
Poster presentation
May 25 (Core Time 18:15 - 19:30) Convention Hall
Contact Bjorn Mysen
Email bmysen@ciw.edu
Convener Bjorn Mysen  / Eiji Ohtani  / Dapeng Zhao 
Scope The principal volatiles in subduction zones and CO2 and H2O derived from devolatilization of carbonate and hydrous minerals in subducted oceanic crust and upper mantle. In the forearc region, highly reduced CH4 may be formed via deserpentinization of forarc mantle. Halogens (F and Cl) are can also be transported at least to upper mantle depth. Fluorine may, in fact, enhance the P-T stability of hydrous minerals. Release of volatiles causes changes in elastic properties of the residual devolatilized rocks, which, in turn, governs seismic velocities, density, shear strength, and compressibility. The intergranular pore fluid also affects these properties. Whether or not fluid forms an interconnected network is critical for these properties. Fluid interconnectivity also controls the extent to which the fluid fluxes melting in and above subducting slabs and the trace and isotopic signatures of the source materials of melting. Physical properties of magma affect style of eruption. These properties, in turn, are affected by H2O/CO2 and F/Cl abundance ratios. This session will focus on observations, experiments and theory to aid our understanding of 1.Relationship between fluid composition, pressure and temperature and connectivity of intergranular fluid. 2.Shear strength and elastic properties of volatile-bearing mineral assemblages 3.Pressure(depth)-temperature and redox-controlled stability of volatile-bearing minerals in subduction zones and beyond. 4.Melting phase relations and volatile compositions in subduction zones 5.Seismic activity and its relation to volatiles in minerals and in fluids and in melts. 6.Solubility and solution mechanisms of major, mineral, and trace elements in silicate-saturated mixed fluids. 7.Silicate-saturated fluids and volatile-saturated melts and alteration processes in subduction zones. 8.Volatiles and style of volcanic eruption

Time Presentation No Title Author Presenter Abstract
Oral Presentation   May 25 AM2 (12:00-12:45) 303                              to the top
12:00 - 12:30 Invited
Carbon mobility by hydrous carbonate liquids at subduction zones POLI, Stefano POLI, Stefano English
12:30 - 12:45 SCG14-02 H/D isotope salt effects in electrolyte-bearing aqueous solutions: In situ experiments at supercritical conditions FOUSTOUKOS, Dionysis
MYSEN, Bjorn
FOUSTOUKOS, Dionysis English
Oral Presentation   May 25 PM1 (14:15-16:00) 303                              to the top
14:15 - 14:45 Invited
14:45 - 15:00 SCG14-04 Intergranular fluid compositions in mantle xenoliths inferred from direct observation of crystal surfaces OHTANI, Mari
NAKAMURA, Michihiko
YOSHIDA, Takeyoshi
OHTANI, Mari English
15:00 - 15:15 SCG14-05 Dehydration of chlorite and formation of a new hydrous phase CAI, Nao
FUJINO, Kiyoshi
CAI, Nao English
15:15 - 15:30 SCG14-06 Concentration dependence of water diffusion in silica glass at water pressure of 50 bar KURODA, Minami
OKUMURA, Satoshi
KURODA, Minami English
15:30 - 15:45 SCG14-07 Behavior of water, major and trace elements in subduction zone magmatism KIMURA, Jun-ichi KIMURA, Jun-ichi English
15:45 - 16:00 SCG14-08 Phase diagrams for CaCO_{3} + H_{2}O and their bearing on the genesis of carbonate melts POLI, Stefano POLI, Stefano English
Oral Presentation   May 25 PM2 (16:15-18:00) 303                              to the top
16:15 - 16:30 SCG14-09 C-O-H volatiles, redox variation and hydrogen isotope fractionation in silicate-COH systems in subduction zones MYSEN, Bjorn MYSEN, Bjorn English
16:30 - 16:45 SCG14-10 Deep slab structure, dehydration and the Changbai intraplate volcanism CHEN, Chuanxu
ZHAO, Dapeng
ZHAO, Dapeng English
16:45 - 17:00 SCG14-11 Hydrogen isotope fractionation between melts and aqueous fluid: Implications for magmatic processes DALOU, Celia
LE LOSQ, Charles
MYSEN, Bjorn
DALOU, Celia English
17:00 - 17:15 SCG14-12 Experimental study on the origin of the D/H fractionation between silicate melts and aqueous fluids at HT/HP conditions LE LOSQ, Charles
CODY, George D.
DALOU, Celia
LE LOSQ, Charles English
17:15 - 17:30 3-min talk in an oral session (SCG14-P01)

Presentation No Title Author Presenter Abstract
Poster Presentation   May 25  Core Time (18:15-19:30) Convention Hall                    to the top
SCG14-P01 GHz P wave buffer rod-transducer and its application to DAC experiments YONEDA, Akira YONEDA, Akira English