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Microbial methane production rates in gas hydrate-bearing sediments from the eastern Nankai Trough, off central Japan

Yoshioka, H., Sakata, S., Cragg, Barry Andrew, Parkes, Ronald John and Fujii, T. 2009. Microbial methane production rates in gas hydrate-bearing sediments from the eastern Nankai Trough, off central Japan. Geochemical Journal 43 (5) , pp. 315-321.

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Gas hydrates and associated high methane concentrations are widely distributed along the boundary of the Nankai Trough off Japan. Radiotracer activity measurements were conducted to estimate current methane production rates in sediment cores at two sites in the eastern Nankai Trough off Tokai containing gas hydrates. Low rates of methanogenesis from CO2 reduction and acetate fermentation were detected within the gas hydrate-stability zone and below the Bottom Simulating Reflector (BSR), but not in sediments from shallow depths (<100 mbsf). The detected production rates of methane from acetate were much higher than those from carbon dioxide and hydrogen. Methanol or potentially some other methyl compounds could also be used for microbial methane production. Deep methane production rates from acetate in the gas hydrate-bearing sediments were higher than in pre-accretionary, hydrate-free sediments at sites 1173, 1174 and 1177 of ODP Leg 190 from the floor of the western Nankai Trough off Shikoku Island. As previously suggested this might be due to upward fluid flow stimulating bacterial activities around and below the base of the gas hydrate zone. In contrast, methanogenesis from carbon dioxide and hydrogen was the main pathway for microbial methane production in the hydrate- free sediments at the ODP Nankai Trough sites.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Q Science > QR Microbiology
Uncontrolled Keywords: Marine sediments ; Gas hydrate ; Nankai Trough ; Methane ; Acetate ; Methanogenesis ; BSR.
Publisher: Geochemical Society of Japan
ISSN: 0016-7002
Last Modified: 12 Jun 2019 02:18

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