Hostname: page-component-76fb5796d-skm99 Total loading time: 0 Render date: 2024-04-26T02:43:02.280Z Has data issue: false hasContentIssue false
  • English
  • Français

Pathways for Escape of Magmatic Carbon Dioxide to Soil Air at Unzen Volcano, SW Japan

Published online by Cambridge University Press:  18 July 2016

Hiroshi A Takahashi ,
Kohei Kazahaya ,
Hiroshi Shinohara  and
Toshio Nakamura
Hiroshi A Takahashi*
Affiliation:
Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, 305-8567, Japan.
Kohei Kazahaya
Affiliation:
Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, 305-8567, Japan.
Hiroshi Shinohara
Affiliation:
Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, 305-8567, Japan.
Toshio Nakamura
Affiliation:
Center for Chronological Research, Nagoya University, Chikusa-ku, Nagoya, 464-8602, Japan.
*
Corresponding author. Email: h.a.takahashi@aist.go.jp.
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Estimation of the magmatic contribution to soil air at Unzen Volcano, SW Japan, was carried out using carbon isotopes, both 14C and 13C, and a mixing model of isotopic mass balance in order to assess the spatial variation of magmatic influence from the volcano. The advantage of using soil air samples is that a wide range of gas sampling sites can be selected. Magmatic CO2 contributed mostly in the eastern region from Unzen Volcano. The high magmatic contribution to soil air appeared along the Akamatsudani fault zone located southeast of the volcano. Our observations across the fault also showed remarkable peaks of CO2 concentration and δ13C values, suggesting that magmatic fluid comes up along the fracture zone as for the normal fault system of the graben.

Type
Articles
Information
Radiocarbon , Volume 46 , Issue 1: Proceedings of the 18th International Radiocarbon Conference (Part 1 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 491 - 496
Copyright
Copyright © 2004 by the Arizona Board of Regents on behalf of the University of Arizona 

References

Hernández, PA, Notsu, K, Salazar, M, Mori, T, Natale, G, Okada, H, Virgili, G, Shimoike, Y, Sato, M, Peréz, NM. 2001. Carbon dioxide degassing by advective flow from Usu Volcano, Japan. Science 292:83–6.Google Scholar
Hoshizumi, H, Uto, K, Matsumoto, T, Shu, S, Kurihara, A, Sumii, T. 2002. History of Unzen Volcano. Gekkan Chikyu 282:828–34. In Japanese.Google Scholar
Levin, I, Kromer, B. 1997. Twenty years of high precision atmospheric 14CO2 observations at Schauinsland station, Germany. Radiocarbon 39(2):205–18.Google Scholar
Ohsawa, S, Kazahaya, K, Yasuhar, a M, Kono, T, Kitaoka, K, Yusa, Y, Yamaguchi, K. 2002. Escape of volcanic gas into shallow groundwater system at Unzen Volcano (Japan): evidence from chemical and stable carbon isotope compositions of dissolved inorganic carbon. Limnology 3:169–73.Google Scholar
Sano, Y, Marty, B. 1995. Origin of carbon in fumarolic gas from island arcs. Chemical Geology 119:265–74.Google Scholar
Smith, BN, Epstein, S. 1971. Two categories of 13C/12C ratios for higher plants. Plant Physiology 47:380–4.CrossRefGoogle Scholar
Takahashi, HA, Kazahaya, K, Shinohara, H, Nakamura, T. Forthcoming. Application of radiocarbon to detect a deep source CO2 in soil air. Nuclear Instruments and Methods in Physics Research B. Google Scholar
Wickman, FE. 1952. Variations in the relative abundance of the carbon isotopes in plants. Geochimica et Cosmochimica Acta 2:243–54.Google Scholar