Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2857g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 10, pp.2857-2864
Other
8
Scientific paper
Hydrothermal activity above Loihi submarine volcano was characterized by water column distributions of methane, pH and helium-3. It was found that the southern Loihi summit is almost covered with hydrothermal plumes, which have anomalously high concentrations of methane ( maximum : 569 × 10 -6 cm 3 kg -1 ) accompanied by high concentrations of helium-3 and low pH values (minimum: 7.18). The plumes consist of two layers: a shallow plume (about 200 m above the summit) and a deep plume (about 100 m above the summit), probably derived from different hydrothermal vents. The shallow and deep plumes showed different CH 4 / 3 He and CH 4 / pH ratios with the same 3 He / pH ratio, which implies that methane concentrations differ between the hydrothermal end members for the two plumes. The variation of methane between the end members is suggested to result from inter-vent inhomogeneity of bacterial activities that consume or produce methane within the vents. Comparison of the CH 4 / 3 He ratios of the two plumes with the previous data for Loihi and other submarine hydrothermal areas confirms that the Loihi hotspot has one to two orders of magnitude smaller CH 4 / 3 He value than those of the East Pacific Rise and the Galapagos spreading centers.
Gamo Toshitaka
Ishibashi Jun-Ichiro
Sakai Hitoshi
Tilbrook Bronte
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