Abstract:This report presents mineralogical, geochemical and isotopic data on samples obtained using the Benthic Multi-coring System (BMS) to drill a submarine hydrothermal deposit developed in a caldera on the summit of the Suiyo Seamount in the Izu -Bonin Island Arc, south of Japan. This deposit is regarded as the fi rst example of Kuroko-type sulfi de mineralization on a volcano at the volcanic front of an island arc. The mineralization and hydrothermal alteration below the 300 × 150-m area of active venting was inv… Show more
“…7p; Table 4) and is probably similar to clear smokers described in MOR-related vent sites (Bogdanov et al, 2006b). At Suiyo volcano, the chalcopyrite-rich chimneys of black and grey smokers are widespread (Watanabe and Kajimura, 1993;Ishibashi and Urabe, 1995;Marumo et al, 2008). The studied sample of black to grey chalcopyrite-pyrite smokers was presented by T. Urabe.…”
Section: Accepted Manuscriptmentioning
confidence: 97%
“…Numerous mineralogical data on modern black and white smokers are scattered through a number of publications (e.g., Halbach and Pracejus, 1993;Marumo et al, 2008;Scott, 1997;Lein et al, 2003;Bogdanov et al, 2006;Rona, 2008;Fouquet et al, 2010;Berkenbosh et al, 2012). Little is published on the mineral peculiarities of chimneys from the ancient VMS deposits (Herrington et al 1998;Maslennikova and Maslennikov, 2007;Maslennikov et al, 2009Maslennikov et al, , 2013Revan et al, 2014).…”
“…7p; Table 4) and is probably similar to clear smokers described in MOR-related vent sites (Bogdanov et al, 2006b). At Suiyo volcano, the chalcopyrite-rich chimneys of black and grey smokers are widespread (Watanabe and Kajimura, 1993;Ishibashi and Urabe, 1995;Marumo et al, 2008). The studied sample of black to grey chalcopyrite-pyrite smokers was presented by T. Urabe.…”
Section: Accepted Manuscriptmentioning
confidence: 97%
“…Numerous mineralogical data on modern black and white smokers are scattered through a number of publications (e.g., Halbach and Pracejus, 1993;Marumo et al, 2008;Scott, 1997;Lein et al, 2003;Bogdanov et al, 2006;Rona, 2008;Fouquet et al, 2010;Berkenbosh et al, 2012). Little is published on the mineral peculiarities of chimneys from the ancient VMS deposits (Herrington et al 1998;Maslennikova and Maslennikov, 2007;Maslennikov et al, 2009Maslennikov et al, , 2013Revan et al, 2014).…”
“…Seven boreholes (called APSK01 to APSK07) were drilled on the seafloor using BMS in June 2001, and three boreholes (APSK08 to APSK10) were added in July 2002. The analysis of core samples obtained from the boreholes have indicated that there is an impermeable layer, which consists of clay and anhydrite, at 1–3 m depth below the seafloor, and that over 300°C hydrothermal fluids are trapped below the layer (Urabe et al, 2002; Marumo et al, 2008). …”
To directly access the sub-seafloor microbial communities, seafloor drilling has been done in a deep-sea hydrothermal field of the Suiyo Seamount, Izu-Bonin Arc, Western Pacific. In the present study, crustal fluids were collected from the boreholes, and the bacterial and archaeal communities in the fluids were investigated by culture-independent molecular analysis based on 16S rRNA gene sequences. Bottom seawater, sands, rocks, sulfide mound, and chimneys were also collected around the boreholes and analyzed for comparisons. Comprehensive analysis revealed the characteristics of the microbial community composition in the crustal fluids. Phylotypes closely related to cultured species, e.g., Alteromonas, Halomonas, Marinobacter, were relatively abundant in some crustal fluid samples, whereas the phylotypes related to Pelagibacter and the SUP05-group were relatively abundant in the seawater samples. Phylotypes related to other uncultured environmental clones in Alphaproteobacteria and Gammaproteobacteria were relatively abundant in the sand, rock, sulfide mound, and chimney samples. Furthermore, comparative analysis with previous studies of the Suiyo Seamount crustal fluids indicates the change in the microbial community composition for 3 years. Our results provide novel insights into the characteristics of the microbial communities in crustal fluids beneath a deep-sea hydrothermal field.
“…Marumo et al 2008). Although it may be difficult to penetrate the fluid reservoir even with the maximum capacity, drilling by the BMS is accessible to a region where various interactions are expected to be induced by mixing between the hydrothermal component and entrained seawater.…”
TAIGA11 cruise of R/V Hakurei-maru No.2 was conducted in June, 2011 to study subseafloor geochemical environment below active hydrothermal fields using a shallow drilling system BMS (Benthic Multi-coring System). 04 0 E). In this chapter, we will report chemical composition and isotope ratios of pore fluids extracted from collected sediments. At the Hakurei field in the Izena Hole, BMS drilling attained to 610 cmbsf (cm below the seafloor) in the vicinity of a large massive sulfide mound. The obtained core showed evidence for sulfide and sulfate mineralization below 223 cmbsf. Pore fluid from the corresponding depth showed enrichment in Si, K and Ca, which could be attributed to influence of formation of alteration minerals rather than to involvement of the hydrothermal component. At the Jade field in the Izena Hole, BMS drilling attained to 529 cmbsf at about 300 m apart from the area where high temperature fluid venting congregate. The obtained core comprised grayish white hydrothermal altered mud below 370 cmbsf, although pore fluid showed seawater like composition. At the Iheya North Knoll field, BMS drilling attained to 453 cmbsf at about 200 m apart from the central mound area. The obtained core consisted almost entirely of grayish white hydrothermally altered mud. Pore fluid below 180 cmbsf showed substantial enrichment in major cations (Na, K, Ca and Mg) and Cl, which would be explained as a result of hydration during hydrothermal alteration.
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