[S-GC45] Volatiles in the Earth - from Surface to Deep Mantle

Mon. May 25, 2026 10:45 AM - 12:15 PM Convention Hall (CH-B) (International Conference Hall, Makuhari Messe)

Chairperson:Hanyu Takeshi(Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics), Caracausi Antonio(National Institute of Geophysics and Volcanology)

Volatiles play an essential role in the dynamic and chemical processes in the Earth's interior. The presence of volatiles drastically changes the mineral stability and rheological behavior of the rocks. Chemical fractionation, such as partial melting, hydration, and dehydration, is controlled by volatiles in the rocks. Volatiles enhance the production of magma and drive their ascent and volcanic eruption. The atmosphere and hydrosphere have been generated by various degassing events from the mantle through volcanism. Some volatiles in the Earth's surface have been suggested to be recycled back into the mantle beyond subduction zones. Although the significance of volatiles in the Earth's evolution has been recognized, each of these processes is poorly constrained. We therefore welcome contributions from experimental, observational, and modeling studies that help shed light on the behavior, chemical/physical characteristics, and flux/budget of volatiles, such as hydrogen, carbon, nitrogen, noble gases, halogens, and sulfur. We encourage studies linking the behavior of multiple volatile elements and their isotopic compositions. Studies investigating the linkage between volatile and solid geochemical tracers, the phase equilibria of volatile-bearing mantle assemblages, and the effect of volatiles on the physical properties of the mantle are also welcome.

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10:45 AM - 11:00 AM

[SGC45-07] Noble Gas Isotopic Constraints on Mantle Circulation: Insights from North Pacific Petit-Spot Mantle Xenoliths

Takaaki Arai², *Hirochika Sumino¹, Nanae Fukushima¹, Naoto Hirano³, Shiki Machida⁴, Akira Ishikawa⁵, Norikatsu Akizawa⁶ (1. Research Center for Advanced Science and Technology, The University of Tokyo, 2. Graduate School of Science, The University of Tokyo, 3. Center for Northeast Asian Studies, Tohoku University, 4. Ocean Resources Research Center for Next Generation, Chiba Institute of Technology, 5. Department of Earth and Planetary Sciences, Institute of Science Tokyo, 6. Graduate School of Advanced Science and Engineering, Hiroshima University)

11:00 AM - 11:15 AM

[SGC45-08] Hydrogen and oxygen isotopes of fluid inclusions in ophicarbonates show a linear variation from hydrothermal fluids beneath mid-ocean ridges toward meteoric water with lighter isotopes

*Tatsuhiko Kawamoto¹, Ryu Uemura², Keishi Matsuda¹, Reiya Kitajima¹, Toma Tanaka¹, Hiroyuki Kaneko¹, Yosuke Osawa¹, kazuhiro Inukai¹, Itsuki Kageta¹, Miki Tasaka¹, Hajime Taniuchi⁶, Osamu Abe², Kenneth Koga³, Estelle Koga Rose³, Francesca Meneghini⁵, Christian Nicollet⁴ (1. Department of Geoscience, Faculty of Science, Shizuoka University, 2. Graduate school of enviromental science, Nagoya University , 3. School of Earth Science, University of Orleans, 4. Laboratory of Magmas and Volcanoes, University of Clermond, 5. Department of Geoscience, University of Pisa, 6. AIST)

11:15 AM - 11:30 AM

[SGC45-09] Influence of Hydration in Deep Volatile Transport Across the Akimotoite-Bridgmanite Transition in Cold Slabs

*Priyanka Pandit¹, Gaurav Shukla^1,2 (1. Indian Institution of Science Education and Research Kolkata , 2. National Center for High Pressure Studies,Kalyani,India)

11:30 AM - 11:45 AM

[SGC45-10] Shimanto shales record coupled light stable isotope fractionation in the shallow subduction channel

★Invited Papers

*Michael R Hudak¹, Maureen D Feineman², Hanh-Tu Ella Do^3,2, Samuele Agostini⁴ (1. Williams College, MA, USA, 2. The Pennsylvania State University, PA, USA, 3. Università di Bologna, Bologna, Italy, 4. Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa, Italy)

11:45 AM - 12:00 PM

[SGC45-11] Intra-grain path and storage of mantle melts/fluids inferred from mantle-derived olivine xenocrysts

*Ryo Tsukawaki¹, Terumi Ejima¹, Atusi Ninomiya², Yuto Sato³, Hirochika Sumino⁴, Yoshiaki Kon⁶, Shoji Arai⁵ (1. Shinshu Univ., 2. Sumiko Res. Exp. & Dev. Co., 3. JAMSTEC Kochi, 4. RCAST, Univ. of Tokyo, 5. Kanazawa Univ., 6. Geological Survey of Japan, AIST)

12:00 PM - 12:15 PM

[SGC45-12] Gas geochemistry of hot springs associated with an earthquake swarm in northeastern Yamaguchi, Japan

*Donghwan Kim¹, Takanori Kagoshima², Naoto Takahata¹, Takaaki Shirai³, Yuji Sano⁴, Naoshi Hirata⁵ (1. Atmosphere and Ocean Research Institute, The University of Tokyo, 2. University of Toyama, 3. Hagi Geopark Promotion Council, Hagi City Office, 4. Center for Advanced Marine Core Research, Kochi University, 5. Earthquake Research Institute, The University of Tokyo)

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