Japan Geoscience Union Meeting 2015

Session information


Symbol S (Solid Earth Sciences) » S-GC Geochemistry

[S-GC51] Frontiers in noble gas isotope geosciences

Sun. May 24, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Hironobu Hyodo(Research Institute of Natural Sciences, Okayama University of Science), Hirochika Sumino(Geochemical Research Center, Graduate School of Science, University of Tokyo), Takahiro Tagami(Graduate School of Science, Kyoto University)

Noble gas isotopes show unique chemical behavior by not forming compounds with other elements, and because of this they have been often used as important and distinctive geochemical and cosmochemical tracers. Since the first attempt on absolute dating was carried out using the U-He system, other dating methods involving noble gas isotopes, such as the K-Ar (Ar-Ar) system, have been developed and used as powerful tools in geochronology. Physical analysis of diffusion processes involving radiogenic noble gases in minerals has led to the concept of closure temperature, resulting in improved understanding of discordant ages between different isotope systems and their geologic interpretation. Recently developed `next generation' noble gas mass spectrometers enable isotope ratio determination at ultrahigh precision utilizing multi-collectors and high sensitivity ion source and detectors. These innovations facilitate high spatial resolution noble gas isotope measurements at the 10-microns scale in rocks and minerals. In this session, we welcome contributions from various cutting-edge analytical techniques and geoscience applications of noble gas isotopes including neutron conversion of other elements to noble gas isotopes and new insights from conventional methods.

6:15 PM - 7:30 PM

*Takuya SAITO1, Huaning Qiu2, Takazo SHIBUYA3, Shigenori MARUYAMA4 (1.Department of Earth and Planetary Science, Tokyo Institute of Technology, 2.Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, 3.Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology, 4.Earth-Life Science Institute, Tokyo Institute of Technology)