scholarly journals Variability in the microbial communities and hydrothermal fluid chemistry at the newly discovered Mariner hydrothermal field, southern Lau Basin

2008 ◽  
Vol 113 (G2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Ken Takai ◽  
Takuro Nunoura ◽  
Jun-ichiro Ishibashi ◽  
John Lupton ◽  
Ryohei Suzuki ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Hydrothermal Fluid ◽  
Hydrothermal Field ◽  
Lau Basin ◽  
Fluid Chemistry

Hydrothermal Venting at Hinepuia Submarine Volcano, Kermadec Arc: Understanding Magmatic-Hydrothermal Fluid Chemistry

2017 ◽  
Vol 18 (10) ◽  
pp. 3646-3661 ◽  
Author(s):  
Valerie K. Stucker ◽  
Sharon L. Walker ◽  
Cornel E. J. de Ronde ◽  
Fabio Caratori Tontini ◽  
Shinji Tsuchida
Keyword(s):  
Hydrothermal Fluid ◽  
Submarine Volcano ◽  
Fluid Chemistry ◽  
Hydrothermal Venting

scholarly journals Characteristics of Microbial Communities in Crustal Fluids in a Deep-Sea Hydrothermal Field of the Suiyo Seamount

2013 ◽  
Vol 4 ◽  
Author(s):  
Shingo Kato ◽  
Michiyuki Nakawake ◽  
Junko Kita ◽  
Toshiro Yamanaka ◽  
Motoo Utsumi ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Deep Sea ◽  
Hydrothermal Field ◽  
Crustal Fluids

scholarly journals Microbial Community Stratification Controlled by the Subseafloor Fluid Flow and Geothermal Gradient at the Iheya North Hydrothermal Field in the Mid-Okinawa Trough (Integrated Ocean Drilling Program Expedition 331)

2014 ◽  
Vol 80 (19) ◽  
pp. 6126-6135 ◽  
Author(s):  
Katsunori Yanagawa ◽  
Anja Breuker ◽  
Axel Schippers ◽  
Manabu Nishizawa ◽  
Akira Ijiri ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Microbial Communities ◽  
Okinawa Trough ◽  
Geothermal Gradient ◽  
Hydrothermal Field ◽  
Rrna Gene ◽  
Ocean Drilling Program ◽  
Content Type ◽  
Ocean Drilling ◽  
Integrated Ocean Drilling Program

ABSTRACTThe impacts of lithologic structure and geothermal gradient on subseafloor microbial communities were investigated at a marginal site of the Iheya North hydrothermal field in the Mid-Okinawa Trough. Subsurface marine sediments composed of hemipelagic muds and volcaniclastic deposits were recovered through a depth of 151 m below the seafloor at site C0017 during Integrated Ocean Drilling Program Expedition 331. Microbial communities inferred from 16S rRNA gene clone sequencing in low-temperature hemipelagic sediments were mainly composed of members of theChloroflexiand deep-sea archaeal group. In contrast, 16S rRNA gene sequences of marine group IThaumarchaeotadominated the microbial phylotype communities in the coarse-grained pumiceous gravels interbedded between the hemipelagic sediments. Based on the physical properties of sediments such as temperature and permeability, the porewater chemistry, and the microbial phylotype compositions, the shift in the physical properties of the sediments is suggested to induce a potential subseafloor recharging flow of oxygenated seawater in the permeable zone, leading to the generation of variable chemical environments and microbial communities in the subseafloor habitats. In addition, the deepest section of sediments under high-temperature conditions (∼90°C) harbored the sequences of an uncultivated archaeal lineage of hot water crenarchaeotic group IV that may be associated with the high-temperature hydrothermal fluid flow. These results indicate that the subseafloor microbial community compositions and functions at the marginal site of the hydrothermal field are highly affected by the complex fluid flow structure, such as recharging seawater and underlying hydrothermal fluids, coupled with the lithologic transition of sediments.

scholarly journals Post-drilling changes in fluid discharge pattern, mineral deposition, and fluid chemistry in the Iheya North hydrothermal field, Okinawa Trough

2013 ◽  
Vol 14 (11) ◽  
pp. 4774-4790 ◽  
Author(s):  
Shinsuke Kawagucci ◽  
Junichi Miyazaki ◽  
Ryota Nakajima ◽  
Tatsuo Nozaki ◽  
Yutaro Takaya ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Field ◽  
Discharge Pattern ◽  
Fluid Chemistry ◽  
Mineral Deposition

Seafloor eruptions and evolution of hydrothermal fluid chemistry

1999 ◽  
pp. 153-170 ◽  
Author(s):  
D. A. Butterfield ◽  
I. R. Jonasson ◽  
G. J. Massoth ◽  
R. A. Feely ◽  
K. K. Roe ◽  
...  
Keyword(s):  
Hydrothermal Fluid ◽  
Fluid Chemistry

3D Seismic Imaging and Geophysical Characteristics of an Embryo Hydrothermal Field in the Southern Okinawa Trough

2020 ◽  
Author(s):  
Ho-Han Hsu ◽  
Liang-Fu Lin ◽  
Tzu-Ting Chen ◽  
Char-Shine Liu ◽  
Jih-Hsin Chang ◽  
...  
Keyword(s):  
Hydrothermal Fluid ◽  
Okinawa Trough ◽  
Hydrothermal Field ◽  
3D Seismic ◽  
Side Scan Sonar ◽  
Massive Sulfides ◽  
Single Beam ◽  
Southern Okinawa Trough ◽  
Fault Structures ◽  
Back Arc

<p>    Multi-scale geophysical survey including pseudo-3D seismic, sub-bottom profiling, side-scan sonar, multi-beam and single-beam bathymetry, heat flow investigations as well as bottom-water, core and dredge sampling works have been conducted in a newly discovered hydrothermal field named as Geolin Mounds at about 1,510 depth in the Okinawa Trough. Ship-mounted bathymetric data cannot detect specific morphological features on the seafloor in this field; however, “rock grove” morphological characteristics are observed by using deep-towed side-scan sonar. Moreover, vigorous flare features in water column are detected by multi-beam and single-beam echo sounder, and widely distributed high heat flow anomalies (> 10,000 mW/m<sup>2</sup>) also exist in the survey area. Due to strong Kuroshio Current during our multi-channel seismic survey, 5-40°streamer feathering effect occurred. To take advantage of swath distributed seismic reflection points caused by streamer feathering, we developed a pseudo-3D technique and produced a 3D seismic cube from this uneven seismic dataset. The 3D seismic imaging and sub-bottom profiling results indicate widely-distributed anomalies such as blanking zone and high-amplitude reflectors around the Geolin Mounds hydrothermal field and could link the specific features above seafloor. The 3D seismic cube also provides better estimation of the areas of blanking zone on selected time slice and better characterizes fault structures in the hydrothermal field. The geochemical analysis results present high Ag, Au, As, Bi, Cd, Cu, Fe, Pb, Sb, and Zn concentrations have been found in our coring and dredging samples. Relatively high concentration of methane, rare earth elements and <sup>3</sup>He/<sup>4</sup>He ratio in near bottom seawater samples are also shown. Based on the geophysical and geochemical works, we propose that the Geolin Mounds hydrothermal field is without underlying submarine volcanos and hydrothermal fluid migration could be related to fault development. This hydrothermal field is in its embryo stage of evolution and constantly supported by active hydrothermal circulation. As a consequence, seafloor massive sulfides deposits and related geomorphological features can keep developing with hydrothermal fluid circulation along migration conduits. The fault structures and volcanic activities due to back-arc spreading process in the Southern Okinawa Trough should dominated creatures of those fluid migrating conduits.  We suggest that the Geolin Mounds hydrothermal field could sustainably grow and have high potential of massive sulfides resources in the Southern Okinawa Trough. Furthermore, this hydrothermal field can serve as a good observatory for get better understanding of seafloor edifice development and ore mineralization associated with hydrothermal circulation activities in a back-arc spreading tectonics.</p>

scholarly journals Sediment Microbial Communities Influenced by Cool Hydrothermal Fluid Migration

2018 ◽  
Vol 9 ◽  
Author(s):  
Laura A. Zinke ◽  
Brandi Kiel Reese ◽  
James McManus ◽  
Charles G. Wheat ◽  
Beth N. Orcutt ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Hydrothermal Fluid ◽  
Fluid Migration
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