Hydrothermal fluid flow system around the Iheya North Knoll in the mid-Okinawa trough based on seismic reflection data

Tsuji, Takeshi; Takai, Ken; Oiwane, Hisashi; Nakamura, Yasuyuki; Yoshio, Masaki; Kumagai, Hitoshi; Kinoshita, Masataka; Yamamoto, Fujio; Okano, T.; Kuramoto, Shigeru

doi:10.1016/j.jvolgeores.2011.11.007

Cited by 76 publications

(68 citation statements)

References 36 publications

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“…Glasby et al (2008) argued that sulfide ore samples collected from hydrothermal fields in submarine volcanoes of the Izu-Bonin Arc showed greater similarities in chemical composition to that of the Kuroko-type deposits, although they recognized hydrothermal fields in the Okinawa Trough showed resemblance in the tectonic setting. In 2010, IODP Expedition 331 drilled through the active hydrothermal field at the Iheya North Knoll hydrothermal field, providing a unique opportunity to directly access the hydrothermal system below the seafloor (Takai et al , 2012. Mineral textures and assemblages present in the drilled cores obtained from a hydrothermal mound in the proximal area were consistent with those recognized in ancient Kuroko-type mineralization (Yeats et al 2012;Yeats and Hollis 2013).…”

Section: Introductionmentioning

confidence: 59%

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Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Ishibashi

Ikegami

Tsuji

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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The Okinawa Trough is a back-arc basin behind the Ryukyu trench-arc system and located along the eastern margin of the Eurasian continent. Sulfide and sulfate mineralization associated with hydrothermal activity has been recognized in ten hydrothermal fields in the Okinawa Trough. Hydrothermal mineralization recognized in these fields is commonly represented by coexisting occurrence of zinc-and lead-enriched polymetallic sulfides and abundant sulfate minerals. The mineralogy and geochemical signatures present has led researchers to suggest these areas may be a modern analogue for the formation of ancient Kuroko-type volcanogenic massive sulfide (VMS) deposits. Recent seafloor drilling during IODP (Integrated Ocean Drilling Program) Expedition 331 documented the subseafloor structure of a hydrothermal system at the Iheya North Knoll. Mineral textures and hydrothermal assemblages present in the drilled cores obtained from a hydrothermal mound in the proximal area are consistent with Kuroko-type mineralization. Based on geochemical studies, the intra-field diversity of mineralization commonly recognized in the Okinawa Trough can be explained by subseafloor phase separation of the hydrothermal fluid, which reflects shallow water depth (from 700 to 1,600 m). The subseafloor phase separation may. play an important role to accumulate metal elements beneath the seafloor. Based on geophysical and geological studies, the Okinawa Trough is considered a back-arc basin in the rifting stage. Such a tectonic setting is characterized by development of normal faulting in brittle continental crust and frequent intrusion of a magma, which can be expected to provide favorable environment for development of a hydrothermal system Keywords

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Section: Introductionmentioning

confidence: 59%

“…27.8). Seismic studies around the Iheya North Koll demonstrated relatively disordered seismic reflectors as deep as 400-500 mbsf (meters below the (Tsuji et al 2012). This suggested presence of pumiceous volcaniclastic flow deposits below surficial hemipelagic sediments, rather than massive igneous rocks.…”

Section: Iheya North Knoll Hydrothermal Fieldmentioning

confidence: 99%

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Ishibashi

Ikegami

Tsuji

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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“…1), and this location has since become the most intensely investigated of all hydrothermal fields within the middle Okinawa Trough, Japan (Aoyama et al, 2014;Chiba et al, 1996;Glasby and Notsu, 2003;Ishibashi et al, 2015;Kawagucci et al, 2013;Masaki et al, 2011;Shao et al, 2015;Takai et al, 2011;Tsuji et al, 2012). During 2010, IODP Expedition 331 drilled five sites at Iheya North.…”

Section: Introductionmentioning

confidence: 99%

Actively forming Kuroko-type volcanic-hosted massive sulfide (VHMS) mineralization at Iheya North, Okinawa Trough, Japan

Yeats

Hollis

Halfpenny

et al. 2017

Ore Geology Reviews

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“…Such infiltrated seawater, passing through the subseafloor environment, contains complex biogeochemical ingredients extracted from host formations up to the wider regional scale (e.g. Tsuji et al 2012). The circulation of hydrothermal systems between seawater and the subseafloor environment has played an important role in the geochemical evolution of the earth.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

Kumagai

Watanabe

Yahagi

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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To elucidate the evolution of hydrothermal activities, we conducted an interdisciplinary study including geochemistry and biology to develop a method of obtaining reliable age information. As geochemical dating techniques, two methods applicable for hydrothermal ore minerals were developed and improved: electron spin resonance method and uranium-thorium disequilibrium method. Cross checks between the two methods generally showed good agreement for the range of hundreds to thousands of years. As biological analysis, the biodiversity among faunal communities in the targeted areas was analyzed at the species and DNA levels. Species and genetic diversity of the local fauna were not always correlated to geochemical dating, either in the southern Mariana Trough region or in the Okinawa Trough region. Although the results are not simple, comparison of age information obtained from analyses of these two disciplines potentially provides important constraints for discussion of the history and evolution of hydrothermal activities.

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Hydrothermal fluid flow system around the Iheya North Knoll in the mid-Okinawa trough based on seismic reflection data

Cited by 76 publications

References 36 publications

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Actively forming Kuroko-type volcanic-hosted massive sulfide (VHMS) mineralization at Iheya North, Okinawa Trough, Japan

Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

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