JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW35] [EJ] Isotope Hydrology 2017

Sat. May 20, 2017 10:45 AM - 12:15 PM 304 (International Conference Hall 3F)

convener:Masaya Yasuhara(Rissho Univ.), Kohei Kazahaya(Geological Survey of Japan, AIST), Kazuyoshi Asai(Geo Science Laboratory), Shinji Ohsawa(Institute for Geothermal Sciences, Graduate School of Science, Kyoto University), Chairperson:Hiroshi Takahashi(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Chairperson:Takashi Nakamura(Univ. Yamanashi), Chairperson:Kazuyoshi Asai(Geo-Science Laboratory), Chairperson:Masaya Yasuhara(Rissho Univ.)

10:45 AM - 11:05 AM

[AHW35-06] A possibility of annually-laminated tufa δ13C record as a reflection of volcanic activity

★Invited papers

*Nagayoshi Katsuta1, Osamu Abe2, ATSUSHI YASUDA3, Sayuri Naito1, Maki Morimoto1, Takuma Murakami2, Shin-ichi Kawakami4 (1.Faculty of Education, Gifu University, 2.Graduate School of Enrionmental Studies, Nagoya University, 3.Earthquake Research Institute, University of Tokyo, 4.Faculty of Education, Gifu Shotoku Gakuen University)

Keywords:Tufa, δ13C, δ18O

Mt. Asama, central Japan, is one of the most active volcano in the Japanese Archipelago, and many springs are distributed in the mountain body and its surrounding areas. The river from Nogori springs (R. Nigori) studied in this work is located in the southern part of the mountain, the spring water of which contains the high concentrations of carbonic acid and iron with 5.7 of pH. From the riverbed and the terrace, we found the carbonate-rich deposits with the annually-lamination (thereafter called tufa) which are formed during the CO2 degassing after flowing out of the springs. In this talk, we present results of the δ13C and δ18O in R. Nogori and the tufa deposits, and then discuss the possibility of tufa δ13C record as a reflection of volcanic activity.