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Title: 超微量の炭素同位体比測定による海底熱水・冷湧水溶存気体に関する研究
Other Titles: Stable carbon isotopic studies of volatile components in seafloor venting hydrothermal and cold seep fluids, using CF-IRMS
Authors: 角皆, 潤1 Browse this author →KAKEN DB
Authors(alt): Tsunogai, Urumu1
Keywords: methane
carbon isotopic composition
hydrothermal and cold seep fluid
carbon monoxide
kinetic isotope frationation
Issue Date: 10-Mar-2002
Publisher: 日本地球化学会
Journal Title: 地球化学
Journal Title(alt): Chikyukagaku (Geochemistry)
Volume: 36
Issue: 1
Start Page: 51
End Page: 63
Abstract: This paper summarizes stable carbon isotopic studies of hydrocarbons, especially methane, in seafloor venting hydrothermal and cold seep fluids, and their effluent methane-enriched plume in water column. Through highly sensitive isotopic analysis using CF-IRMS, we have discussed origin and/or behavior of hydrocarbons in each system. Major results are as follows: (i) methane in cold seep fluids around Japanese islands mostly microbial origin, (ii) methane emitted from cold seep fluids mostly oxidized anaerobically within sediments just before they emitted into ocean, (iii) methane in hydrothermal plume oxidized aerobically in some extent in the water column. Besides, methane flux and heat flux can be calculated for a methane-enriched fluid venting area from δ13C distribution of methane in hydrothermal plume, by using kinetic isotope fractionation which occurs during partial destruction. Similar approach could be also applicable to study origin and behavior of reactive trace components in atmosphere, such as non-methane hydrocarbons and CO. Preliminary results of such studies are also presented.
Type: article
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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