Outline of Session


Solid Earth Sciences(S) / Geochemistry(GC)
S-GC51 Frontiers in noble gas isotope geosciences

Short title Noble gas isotopes
Oral presentation
May 24 PM1 (15:15 - 16:00) A04 Hirochika Sumino  / Hironobu Hyodo 
May 24 PM2 (16:15 - 18:00) A04 Hironobu Hyodo  / Hirochika Sumino 
Poster presentation
May 24 (Core Time 18:15 - 19:30) Convention Hall
Contact Hironobu Hyodo
Email hhyodo@rins.ous.ac.jp
Convener Hironobu Hyodo  / Hirochika Sumino  / Takahiro Tagami 
Scope 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.

Time Presentation No Title Author Presenter Abstract
Oral Presentation   May 24 PM1 (15:15-16:00) A04                              to the top
15:15 - 15:30 SGC51-01 ^{40}Ar/^{39}Ar age of Haedean zircon HYODO, Hironobu
SATO, Keiko
KUMAGAI, Hidenori
HYODO, Hironobu English
15:30 - 15:45 SGC51-02 Two regional metamorphic belts in assemblages of subduction-related orogens in Wales-England, U.K. ASANUMA, Hisashi
ITAYA, Tetsumaru
ASANUMA, Hisashi English
15:45 - 16:00 SGC51-03 Ar/Ar Geochronological analysis of Paka volcano, northern Kenya Rift SUDO, Masafumi
STRECKER, Manfred R.
SUDO, Masafumi English
Oral Presentation   May 24 PM2 (16:15-18:00) A04                              to the top
16:15 - 16:30 Invited
Quantifying seawater assimilation across a single MORB pillow BROADLEY, Michael
KUMAGAI, Hidenori
BROADLEY, Michael English
16:30 - 16:45 SGC51-05 Halogen analysis of mantle xenoliths by extending Ar-Ar and I-Xe dating methods KOBAYASHI, Masahiro
SUMINO, Hirochika
NAGAO, Keisuke
KOBAYASHI, Masahiro English
16:45 - 17:00 SGC51-06 Across-arc variation in noble gas and halogen compositions of volcanic rocks from the Izu-Ogasawara subduction zone SUMINO, Hirochika
SUMINO, Hirochika English
17:00 - 17:15 SGC51-07 Noble gas isotopes; Solar evolution parameter OZIMA, Minoru OZIMA, Minoru English
17:15 - 17:30 Invited
New analytical methods and a system for noble-gas measurements of extraterrestrial materials OKAZAKI, Ryuji OKAZAKI, Ryuji English
17:30 - 17:45 SGC51-09 Relationships between morphological features and isotopic signatures of noble gases of four Itokawa particles NOGUCHI, Takaaki
NOGUCHI, Takaaki English
17:45 - 18:00 3-min talk in an oral session (SGC51-P01/SGC51-P02/SGC51-P03/SGC51-P04/SGC51-P05)

Presentation No Title Author Presenter Abstract
Poster Presentation   May 24  Core Time (18:15-19:30) Convention Hall                    to the top
Present status for in-situ noble gas analysis by Sputtered Neutral Mass Spectrometry with tunneling ionization BAJO, Ken-ichi BAJO, Ken-ichi English
SGC51-P02 New preparation apparatus for noble gas isotope analyses to measure submarine hydrothermal fluids and renewed GVI-5400 SATO, Keiko
KUMAGAI, Hidenori
IWATA, Naoyoshi
SATO, Keiko English
SGC51-P03 High sensitive noble gas mass spectrometer equipped with a Giese-type ion source SUMINO, Hirochika
NAGAO, Keisuke
SUMINO, Hirochika English
SGC51-P04 Ar-Ar dating by fluid inclusions in hydrothermal quartz, compared with its field and microscopic observations SAITO, Takuya
QIU, Huaning
SAITO, Takuya English
SGC51-P05 Possibility of K-Ar age mapping on the moon using cosmogenic ^{39}Ar TAKESHIMA, Yuko
HYODO, Hironobu
ITAYA, Tetsumaru
HYODO, Hironobu English