scholarly journals The Tiger Sulfide Chimney, Yonaguni Knoll IV Hydrothermal Field, Southern Okinawa Trough, Japan: The First Reported Occurrence of Pt-Cu-Fe-Bearing Bismuthinite and Sn-Bearing Chalcopyrite in an Active Seafloor Hydrothermal System

2013 ◽  
Vol 63 (4) ◽  
pp. 360-370 ◽  
Author(s):  
Kaul Gena ◽  
Hitoshi Chiba ◽  
Katsuo Kase ◽  
Kazuo Nakashima ◽  
Daizo Ishiyama
Keyword(s):  
Hydrothermal System ◽  
Okinawa Trough ◽  
Hydrothermal Field ◽  
Southern Okinawa Trough ◽  
Seafloor Hydrothermal System

scholarly journals Marinitoga okinawensis sp. nov., a novel thermophilic and anaerobic heterotroph isolated from a deep-sea hydrothermal field, Southern Okinawa Trough

2007 ◽  
Vol 57 (3) ◽  
pp. 467-471 ◽  
Author(s):  
Takuro Nunoura ◽  
Hanako Oida ◽  
Masayuki Miyazaki ◽  
Yohey Suzuki ◽  
Ken Takai ◽  
...  
Keyword(s):  
Deep Sea ◽  
Gene Sequence ◽  
Okinawa Trough ◽  
Heterotrophic Bacterium ◽  
Fatty Acid Content ◽  
Hydrothermal Field ◽  
Rrna Gene ◽  
Southern Okinawa Trough ◽  
Gene Sequence Analysis ◽  
Bacterium Strain

A novel thermophilic and sulfur-reducing heterotrophic bacterium, strain TFS10-5T, was isolated from a deep-sea hydrothermal field in Yonaguni Knoll IV, Southern Okinawa Trough. Cells of strain TFS10-5T were motile rods, 1.5–5 μm in length and 0.5–0.8 μm in width. Strain TFS10-5T was an obligately anaerobic heterotroph and sulfur-reduction stimulated growth. Growth was observed between 30 and 70 °C (optimum at 55–60 °C), pH 5.0–7.4 (optimum at pH 5.5–5.8), 1.0–5.5 NaCl % (optimum at 3.0–3.5 %). The fatty acid content was C16 : 0 (71.0 %), C16 : 1 (6.0 %), C18 : 0 (21.4 %) and C18 : 1 (1.6 %). The G+C content of the genomic DNA was 28 mol%. 16S rRNA gene sequence analysis indicated that strain TFS10-5T belongs to the genus Marinitoga. Based on the physiological and phylogenetic features of the new isolate, strain TFS10-5T represents a novel species in the genus Marinitoga for which the name Marinitoga okinawensis sp. nov. is proposed. The type strain is TFS10-5T (=JCM 13303T=DSM 17373T).

scholarly journals A deep-towed magnetic survey in the southern Okinawa Trough: Implications for hydrothermal system detection

2019 ◽  
Vol 30 (5) ◽  
pp. 675-683
Author(s):  
Wen-Bin Doo ◽  
Shu-Kun Hsu ◽  
Hsueh-Fen Wang ◽  
Yin-Sheng Huang ◽  
Ching-Hui Tsai ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
Okinawa Trough ◽  
Magnetic Survey ◽  
Southern Okinawa Trough

scholarly journals Atypical Diagenesis and Geochemistry of Redox-Sensitive Elements in Hydrothermal Sediments of the Southern Okinawa Trough

2021 ◽  
Vol 8 ◽  
Author(s):  
Li Li ◽  
Duc Huy Dang ◽  
Xiaojing Wang ◽  
Jihua Liu ◽  
Yonghua Wu ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Sediment Cores ◽  
Principal Component ◽  
Extraction Methods ◽  
Advanced Technology ◽  
Hydrothermal Field ◽  
Pore Waters ◽  
Southern Okinawa Trough ◽  
Hydrothermal Sediments ◽  
Very High

Early diagenesis processes and the geochemistry of redox-sensitive elements (RSEs) in four sediment cores in an active hydrothermal field in the southern Okinawa Trough (OT) was investigated. Dissolved Fe, Mn, ΣHS–, and several other RSEs (Mo, U, and V) in pore water were measured. We also studied metal distribution in sediments using sequential extraction methods. Very high dissolved Fe concentrations (∼140 μmol L–1) but insignificant dissolved Mn were observed in surficial pore waters in the station adjacent to the hydrothermal vent, where highly reactive Fe, Mo, U in the sediments were also measured. Such an atypical diagenetic sequence found in those cores could be driven by the overwhelmingly high reactive Fe fraction (mostly Fe oxides) delivered from the vents. Consequently, significant upward benthic fluxes of Fe and Mo were estimated for the studied stations. In addition, we performed a principal component analysis (PCA), together with relative ratios of carbonate-related elements (Sr, Ca, Mg), to identify particles’ origins in the hydrothermal field; two endmembers being the hydrothermal source and hydrogenous processes. This comprehensive study on a unique set of samples collected by advanced technology provided valuable data to demonstrate distinctive geochemical features that occur in hydrothermal sediments.

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 Microbial community in a sediment-hosted CO2 lake of the southern Okinawa Trough hydrothermal system

2006 ◽  
Vol 103 (38) ◽  
pp. 14164-14169 ◽  
Author(s):  
F. Inagaki ◽  
M. M. M. Kuypers ◽  
U. Tsunogai ◽  
J.-i. Ishibashi ◽  
K.-i. Nakamura ◽  
...  
Keyword(s):  
Microbial Community ◽  
Hydrothermal System ◽  
Okinawa Trough ◽  
Southern Okinawa Trough

scholarly journals Pseudo-3D seismic imaging of Geolin Mounds hydrothermal field in the Southern Okinawa Trough offshore NE Taiwan

2019 ◽  
Vol 30 (5) ◽  
pp. 705-716 ◽  
Author(s):  
Ho-Han Hsu ◽  
Liang-Fu Lin ◽  
Char-Shine Liu ◽  
Jih-Hsin Chang ◽  
Wei-Zhi Liao ◽  
...  
Keyword(s):  
Seismic Imaging ◽  
Okinawa Trough ◽  
Hydrothermal Field ◽  
3D Seismic ◽  
Southern Okinawa Trough
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