Anomalies of bottom CH4 and trace metal concentrations associated with high heat flow at the Calyptogena community off Hatsu-shima Island, Sagami Bay, Japan

A preliminary report of Tansei Maru KT-88-1 cruise Leg-1

Toshitaka Gamo, Junichiro Ishibashi, Klminori Shitashima, Masataka Kinoshita, Masaharu Watanabe, Eiichiro Nakayama, Yoshiki Sohrin, Eun soo Kim, Toshiyuki Masuzawa, Kantaro Fujioka

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Geochemical studies of bottom waters and sediments, including deep sea camera surveys and heat flow measurements, were conducted in the western Sagami Bay, central Japan, where dense clam (Calyptogena soyoae) communities had been previously located by submersible observations. The bottom waters above the communities contained an order of magnitude higher CH4(360-4200 nl kg-1) than those at nearby stations a few kilometers away from the community site (- 130 nl kg’1), implying significant fluid venting rich in CH4 from the bottom at the very community site. The mean life of the seepage CH4 in seawater was estimated to be several days by using a simple vertical diffusion model. Weak correlations were observed between the concentrations of CH4 and trace metals such as Fe, Mn, AI, and Zn. It was found that the community site is characterized by anomalously high heat flow up to 1680 mW m-2, suggesting volcanic heat sources below the site.

Original languageEnglish
Pages (from-to)215-230
Number of pages16
JournalGEOCHEMICAL JOURNAL
Volume22
Issue number5
DOIs
Publication statusPublished - Jan 1 1988

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heat transmission
bottom water
heat flow
trace metal
Japan
anomalies
Heat transfer
anomaly
Thermal variables measurement
Water
venting
deep-sea sediment
flow measurement
submersible
Seepage
Flow measurement
heat source
Seawater
metals
seepage

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Anomalies of bottom CH4 and trace metal concentrations associated with high heat flow at the Calyptogena community off Hatsu-shima Island, Sagami Bay, Japan : A preliminary report of Tansei Maru KT-88-1 cruise Leg-1. / Gamo, Toshitaka; Ishibashi, Junichiro; Shitashima, Klminori; Kinoshita, Masataka; Watanabe, Masaharu; Nakayama, Eiichiro; Sohrin, Yoshiki; Kim, Eun soo; Masuzawa, Toshiyuki; Fujioka, Kantaro.

In: GEOCHEMICAL JOURNAL, Vol. 22, No. 5, 01.01.1988, p. 215-230.

Research output: Contribution to journalArticle

Gamo, Toshitaka ; Ishibashi, Junichiro ; Shitashima, Klminori ; Kinoshita, Masataka ; Watanabe, Masaharu ; Nakayama, Eiichiro ; Sohrin, Yoshiki ; Kim, Eun soo ; Masuzawa, Toshiyuki ; Fujioka, Kantaro. / Anomalies of bottom CH4 and trace metal concentrations associated with high heat flow at the Calyptogena community off Hatsu-shima Island, Sagami Bay, Japan : A preliminary report of Tansei Maru KT-88-1 cruise Leg-1. In: GEOCHEMICAL JOURNAL. 1988 ; Vol. 22, No. 5. pp. 215-230.
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abstract = "Geochemical studies of bottom waters and sediments, including deep sea camera surveys and heat flow measurements, were conducted in the western Sagami Bay, central Japan, where dense clam (Calyptogena soyoae) communities had been previously located by submersible observations. The bottom waters above the communities contained an order of magnitude higher CH4(360-4200 nl kg-1) than those at nearby stations a few kilometers away from the community site (- 130 nl kg’1), implying significant fluid venting rich in CH4 from the bottom at the very community site. The mean life of the seepage CH4 in seawater was estimated to be several days by using a simple vertical diffusion model. Weak correlations were observed between the concentrations of CH4 and trace metals such as Fe, Mn, AI, and Zn. It was found that the community site is characterized by anomalously high heat flow up to 1680 mW m-2, suggesting volcanic heat sources below the site.",
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