@article{oai:nagoya.repo.nii.ac.jp:00011752,
 author = {高橋, 浩 and Takahashi, Hiroshi A. and 風早, 康平 and Kazahaya, Kohei and 篠原, 宏志 and Shinohara, Hiroshi and 森川, 徳敏 and Morikawa, Noritoshi and 安原, 正也 and Yasuhara, Masaya and 稲村, 明彦 and Inamura, Akihiko and 大和田, 道子 and Ohwada, Michiko and 中村, 俊夫 and Nakamura, Toshio},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {雲仙火山の周辺において,マグマ起源の二酸化炭素の寄与がどのような分布になっているのか,土壌ガスと地下水を用いた観測から議論した.対象としたのは,マグマ起源の二酸化炭素の寄与が高いことがわかっている雲仙地溝の内側の東域である.土壌ガスと地下水のそれぞれで得たマグマ性の二酸化炭素の寄与の空間分布は非常に類似した傾向を示した.これは,土壌ガスと地下水へ供給されるマグマ性の二酸化炭素が同一経路を通って上昇してきたことを示唆するものである.また,断層があると考えられる地点では,高いマグマ性の二酸化炭素の寄与があることが示され,断層がマグマ性の流体の通り道になっていると考えられる., Unzen volcano is located on the western part of Beppu-Shimabara graben in Shimabara Peninsula, Kyushu Island, SW Japan. To obtain magmatic CO_2 distribution of volcanic body in Shimabara Peninsula, we carried out both the soil gas and groundwater surveys. Magmatic carbon contribution in soil air and groundwater is estimated using carbon isotope ratios. Here, we compare the spatial variations of magmatic CO_2 flux from soil gas and magmatic carbon concentration in groundwater, and discuss process of CO_2 degassing through volcanic body. Soil gas sample was taken at the depth of 30cm in soil for measurements of CO_2 concentration and carbon isotope. CO_2 flux was measured by a portable CO_2 flux meter (WEST System). Groundwater sample have been collected from springs and wells. The δ^<13>C of soil gas and DIG were measured by CF-IRMS system (Thermo Electron), and some samples were used for ^<14>C measurement by the AMS system. The higher magmatic contribution is shown in the eastern region of Unzen graben both in soil gas and groundwater. The spatial distribution of magmatic CO_2 flux through soil gas in the eastern area shows a good agreement with magmatic carbon concentration in groundwater. The high magmatic contribution is found along the fault or lineament. This suggests that magmatic fluid is upwelling along the fracture zone developed as fault system of Unzen graben., 第17回名古屋大学タンデトロン加速器質量分析計シンポジウム平成16(2004)年度報告 Proceedings of the 17th symposiumon Researches Using the Tandetron AMS System at Nagoya University in 2004\
日時:平成17 (2005)年1月24日(月)､25日(火) 会場:名古屋大学シンポジオン Date:January 24th and 25th, 2005 Place:Nagoya University Symposion Hall},
 pages = {84--90},
 title = {雲仙地溝東城におけるマグマ性二酸化炭素の寄与について : 土壌ガスと地下水による調査(第17回名古屋大学タンデトロン加速器質量分析計シンポジウム平成16(2004)年度報告)},
 volume = {16},
 year = {2005}
}