Jun‐ichiro Ishibashi
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View article: Microscopic evidence for nanoparticle-mediated growth of native gold in sulfide deposits at the Higashi–Aogashima Knoll Caldera hydrothermal field
Microscopic evidence for nanoparticle-mediated growth of native gold in sulfide deposits at the Higashi–Aogashima Knoll Caldera hydrothermal field Open
Gold (or electrum) in hydrothermal fluid precipitates directly from gold sulfide complex and/or partly via suspended nanoparticles. The hydrothermal fluid contains “invisible gold” that is atomically dispersed in sulfide minerals or as nan…
View article: Ocean circulation contributes to genetic connectivity of limpet populations at deep‐sea hydrothermal vents in a back‐arc basin
Ocean circulation contributes to genetic connectivity of limpet populations at deep‐sea hydrothermal vents in a back‐arc basin Open
For endemic benthos inhabiting hydrothermal vent fields, larval recruitment is critical for population maintenance and colonization via migration among separated sites. The vent‐endemic limpet, Lepetodrilus nux , is abundant at deep‐sea hy…
View article: Low-temperature magnetic behavior of isocubanite from seafloor hydrothermal deposits in the Okinawa Trough
Low-temperature magnetic behavior of isocubanite from seafloor hydrothermal deposits in the Okinawa Trough Open
The characteristic behavior of magnetic remanence correlated with mineralogical textures and composition was observed using low-temperature magnetometry, microscopy, and chemical analysis of three isocubanite samples collected from hydroth…
View article: ERRATUM: Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization
ERRATUM: Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization Open
The error appeared in calculations of the sulfur isotopic fractionation correction.
View article: Geochemical Exploration: Application of Fluid Geochemistry to the Utilization of Geothermal Energy
Geochemical Exploration: Application of Fluid Geochemistry to the Utilization of Geothermal Energy Open
Geothermal fluid heated by a magma heat source is available as a geothermal resource when the fluid or vapor is obtained continuously from the subsurface and is introduced into power generation facilities. Exploration of geothermal resourc…
View article: Sr isotopic ratios of hydrothermal fluids from the Okinawa Trough and the implications of variation in fluid–sediment interactions
Sr isotopic ratios of hydrothermal fluids from the Okinawa Trough and the implications of variation in fluid–sediment interactions Open
Sr isotope ratios of hydrothermal fluids were observed at five sediment-associated sites in the Okinawa Trough to investigate the diversity of subseafloor fluid–rock–sediment interactions. The estimated 87 Sr/ 86 Sr ratios of the hydrother…
View article: Ubiquity of Euglena mutabilis Population in Three Ecologically Distinct Acidic Habitats in Southwestern Japan
Ubiquity of Euglena mutabilis Population in Three Ecologically Distinct Acidic Habitats in Southwestern Japan Open
Three strains of Euglena mutabilis were isolated from sediments in acidic inland water systems (pH = 3.4–4.7), in Southwestern Japan—acid mine drainage in Sensui (Fukuoka), cold sulfidic spring in Bougatsuru (Oita), and a temporal pool in …
View article: Subseafloor sulphide deposit formed by pumice replacement mineralisation
Subseafloor sulphide deposit formed by pumice replacement mineralisation Open
Seafloor massive sulphide (SMS) deposits, modern analogues of volcanogenic massive sulphide (VMS) deposits on land, represent future resources of base and precious metals. Studies of VMS deposits have proposed two emplacement mechanisms fo…
View article: ODP Leg 169, Hole 858G - Well Logging Data
ODP Leg 169, Hole 858G - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: ODP Leg 169, Hole 858G - Well Logging Data
ODP Leg 169, Hole 858G - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: ODP Leg 169, Hole 1037B - Well Logging Data
ODP Leg 169, Hole 1037B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: ODP Leg 169, Hole 1037B - Well Logging Data
ODP Leg 169, Hole 1037B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: ODP Leg 169, Hole 856H - Well Logging Data
ODP Leg 169, Hole 856H - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: ODP Leg 169, Hole 856H - Well Logging Data
ODP Leg 169, Hole 856H - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: A Novel Archaeal Lineage in Boiling Hot Springs around Oyasukyo Gorge (Akita, Japan)
A Novel Archaeal Lineage in Boiling Hot Springs around Oyasukyo Gorge (Akita, Japan) Open
A novel deep-branching archaeal lineage was discovered at high-temperature hot springs around Oyasukyo Gorge in Akita Prefecture, Japan. Actively boiling hot spring water contained >1×104 microbes mL-1. The microbial community composition …
View article: Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization
Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization Open
Seafloor hydrothermal deposits form when hydrothermal fluid mixes with ambient seawater, and constituent sulfide minerals are usually interpreted to precipitate abiogenically. Recent research drilling at Izena Hole and Iheya North Knoll in…
View article: MOESM2 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough
MOESM2 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough Open
Additional file 2: Table S2. Data of magnetic hysteresis parameters of each chip specimens extracted from studied lava flows.
View article: MOESM1 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough
MOESM1 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough Open
Additional file 1: Table S1. Data of bulk grain density, magnetic susceptibility, and natural remanent magnetization of each cube specimens extracted from studied lava flows.
View article: MOESM3 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough
MOESM3 of Seafloor hydrothermal alteration affecting magnetic properties of abyssal basaltic rocks: insights from back-arc lavas of the Okinawa Trough Open
Additional file 3: Table S3. Data of thermomagnetic curves of saturation magnetization in 50-700 °C.
View article: A new model for a hydrothermal circulation system and limit of the life
A new model for a hydrothermal circulation system and limit of the life Open
統合国際掘削(IODP)331次航海は,中部沖縄トラフの伊平屋北海丘を対象として2010年9月に実施された.熱水噴出を伴うマウンド直近のSite C0016では,黒鉱鉱床に比する熱水鉱化作用を見出した.マウンド東側数百mに位置するSite C0013,Site C0014からは,かなり浅い深度の堆積層にまで熱水成分が広がることを示す様々な証拠が得られた.一方,1550m離れたSite C0017では,50mbsfに至る海水の浸入が明らかになった.熱水域の海底下には,熱水によ…
View article: Supplementary Table S1 from Deepest and hottest hydrothermal activity in the Okinawa Trough: the Yokosuka site at Yaeyama Knoll
Supplementary Table S1 from Deepest and hottest hydrothermal activity in the Okinawa Trough: the Yokosuka site at Yaeyama Knoll Open
All measurements of fluids from the Yokosuka field.