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溶存メタンを指標に用いた富山湾海底湧出地下水の地球化学的研究

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Title: 溶存メタンを指標に用いた富山湾海底湧出地下水の地球化学的研究
Other Titles: Geochemical studies on submarine groundwater discharges in Toyama Bay using methane as a tracer
Authors: 亀山, 宗彦1 Browse this author →KAKEN DB
角皆, 潤2 Browse this author →KAKEN DB
蒲生, 俊敬3 Browse this author →KAKEN DB
張, 勁4 Browse this author →KAKEN DB
鈴木, 麻衣5 Browse this author
小山, 裕樹6 Browse this author
Authors(alt): KAMEYAMA, Sohiko1
TSUNOGAI, Urumu2
GAMO, Toshitaka3
ZHANG, Jing4
SUZUKI, Mai5
KOYAMA, Yuki6
Keywords: methane
carbon isotope
submarine groundwater discharge
Toyama Bay
Issue Date: 20-Aug-2005
Publisher: 日本地球化学会
Journal Title: 地球化学
Journal Title(alt): Chikyukagaku (Geochemistry)
Volume: 39
Issue: 3
Start Page: 131
End Page: 140
Abstract: We present here a geochemical study on the SGD in the Toyama Bay using CH4 and its carbon isotope ratio as tracers. We found that all SGD fluids and many of land groundwaters contain less methane than natural water in equilibrium with atmospheric CH4. Theδ13C values of CH4 in the SGD fluids range from -50 to -20‰ VPDB, almost comparable or slightly higher than that of atmospheric CH4. The results suggest that most of methane in the SGD fluids had been derived from the atmosphere and a part of the CH4 is oxidized in the course of groundwater flow through the aquifer, with no CH4 production that is usual in highly anoxic groundwater.This is probably due to little organic matter content in the aquifer and/or a short residence time from recharge to discharge on seafloor. The low concentration and high carbon isotopic ratio of CH4 are similar to those in some of the land groundwaters. The SGD fluid in Uozu should be flowing underground along the Katagai River.
Type: article
URI: http://hdl.handle.net/2115/44893
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角皆 潤

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