[S-VC41] Crystal clear: petrological reconstructions of magmatic processes and histories

Thu. May 28, 2026 9:00 AM - 10:30 AM Convention Hall (CH-A) (International Conference Hall, Makuhari Messe)

Chairperson:Kawaguchi Masataka(Earthquake Research Institute, the University of Tokyo), Iwahashi Kurumi(National Institute of Advanced Industrial Science and Technology), Conway Chris(Geological Survey of Japan, AIST)

The physical and chemical characterization of crystals in igneous rocks can be used to document magma system parameters (e.g., composition, temperature, pressure, oxygen fugacity, volatile content) and processes (e.g., fractional crystallization, degassing, magma mixing, crustal assimilation). Textural and compositional variations at the scale of a single crystal, pumice clast, or stratigraphic section can reveal how such parameters and processes evolve over timescales ranging from hours to millennia. Such reconstructions provide necessary contributions to our understanding of the behaviour of volcanoes and their underlying magma reservoirs.
This session will showcase research that aims to clarify the mechanisms and rates of magma generation, storage, extraction, ascent, and eruption, through the analysis of crystals and associated glasses, such as melt inclusions and embayments, in magmatic rocks. We welcome contributions from all volcano-tectonic settings that have utilized any of the following techniques: textural analysis, electron probe microanalysis, mass spectrometry; Raman and infrared spectroscopy; experimental petrology; diffusion chronometry; thermodynamic modelling.

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9:00 AM - 9:30 AM

[SVC41-01] Melt embayments : a powerful tool to archive the shallow magma dynamics one crystal at a time

★Invited Papers

*Guillaume Georgeais¹, Yves Moussallam^1,2, Estelle Rose-Koga³, Ken Koga³ (1. Lamont-Doherty Earth Observatory, Columbia University, New York, NY 10027, USA, 2. Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, USA, 3. Institut des Sciences de la Terre d’Orléans (ISTO), UO/CNRS/BRGM/OSUC, F-45071, Orléans, France)

9:30 AM - 9:45 AM

[SVC41-02] A new quantitative model for multicomponent volatile degassing in magma

*Katsuya Kaneko¹, Aoi Asada¹ (1. Department of Planetology, Graduate School of Science, Kobe University)

9:45 AM - 10:00 AM

[SVC41-03] Melt inclusion constraints on magmatic evolution following the 7.3-ka Akahoya caldera-forming eruption at Kikai Caldera

*Aoi Asada¹, Katsuya Kaneko¹, Takeshi Hanyu², Morihisa Hamada², Kenji Shimizu³, Takayuki Ushikubo³, Qing Chang², Yuuki Hagiwara² (1. Department of Planetology, Graduate School of Science, Kobe University, 2. Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3. Kochi Institute of Core Research, Japan Agency for Marine-Earth Science and Technology)

10:00 AM - 10:15 AM

[SVC41-04] Petrology and noble gas geochemistry of the latest magmatic eruption in Ioto (Iwo-Jima)

*Soho Yamamoto¹, Hirochika Sumino¹, Masashi Nagai², Hidemi Ishibashi³, Muga Yaguchi⁴ (1. The University of Tokyo, 2. National Research Institute for Earth Science and Disaster Resilience, 3. Shizuoka University, 4. Meteorological Research Institute)

10:15 AM - 10:30 AM

[SVC41-05] Is there a leak? Investigating a primary mechanism of hydrogen diffusion in olivine

*Guillaume Georgeais¹, Yves Moussallam^1,2, Mike Jollands³ (1. Lamont-Doherty Earth Observatory, Columbia University, New York, NY 10027, USA, 2. Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, USA, 3. Gemological Institute of America, New York, NY 10036, USA)

Session information