Mercury anomaly in the Okinawa Trough sediments—An indicator of modern seafloor hydrothermal activity

1995 ◽  
Vol 14 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Zhao Yiyang ◽  
Yan Mingcai
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Activity ◽  
The Okinawa Trough ◽  
Seafloor Hydrothermal Activity

scholarly journals Regional oceanographic features and hydrothermal activity influence protist diversity and biogeography in the Okinawa Trough

2019 ◽  
Author(s):  
Margaret Mars Brisbin ◽  
Asa E. Conover ◽  
Satoshi Mitarai
Keyword(s):  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
Hydrothermal Activity ◽  
Water Masses ◽  
Mass Composition ◽  
Rare Biosphere ◽  
Environmental Selection ◽  
The Okinawa Trough ◽  
Dispersal Barriers ◽  
Bottom Waters

AbstractMicrobial eukaryotes (protists) contribute substantially to ecological functioning in marine ecosystems, but factors shaping protist diversity, such as dispersal barriers and environmental selection, remain difficult to parse. Deep-sea water masses, which form geographic barriers, and hydrothermal vents, which represent isolated productivity hotspots, are ideal opportunities for studying the effects of dispersal barriers and environmental selection on protist communities. The Okinawa Trough, a deep, back-arc spreading basin, contains distinct water masses in the bottom waters of northern and southern regions and at least twenty-five active hydrothermal vents. In this study, we used metabarcoding to characterize protist communities from fourteen stations spanning the length of the Okinawa Trough, including three hydrothermal vent sites. Significant differences in community structure reflecting regional oceanography and water mass composition were present, indicating the importance of geographic factors in shaping protist communities. Protist communities in bottom waters affected by hydrothermal activity were significantly different from communities in other bottom waters, suggesting that environmental factors can be especially important in shaping community composition under specific conditions. Amplicon sequence variants that were enriched in hydrothermally influenced bottom waters largely derived from cosmopolitan protists that were present, but rare, in other near-bottom samples, thus highlighting the importance of the rare biosphere.

scholarly journals Deepest and hottest hydrothermal activity in the Okinawa Trough: the Yokosuka site at Yaeyama Knoll

2017 ◽  
Vol 4 (12) ◽  
pp. 171570 ◽  
Author(s):  
Junichi Miyazaki ◽  
Shinsuke Kawagucci ◽  
Akiko Makabe ◽  
Ayu Takahashi ◽  
Kazuya Kitada ◽  
...  
Keyword(s):  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
Water Pressure ◽  
Chemical Properties ◽  
Hydrothermal Activity ◽  
Future Research ◽  
Depth Range ◽  
Fluid Temperature ◽  
The Okinawa Trough ◽  
Ryukyu Arc

Since the initial discovery of hydrothermal vents in 1977, these ‘extreme’ chemosynthetic systems have been a focus of interdisciplinary research. The Okinawa Trough (OT), located in the semi-enclosed East China Sea between the Eurasian continent and the Ryukyu arc, hosts more than 20 known vent sites but all within a relatively narrow depth range (600–1880 m). Depth is a significant factor in determining fluid temperature and chemistry, as well as biological composition. However, due to the narrow depth range of known sites, the actual influence of depth here has been poorly resolved. Here, the Yokosuka site (2190 m), the first OT vent exceeding 2000 m depth is reported. A highly active hydrothermal vent site centred around four active vent chimneys reaching 364°C in temperature, it is the hottest in the OT. Notable Cl depletion (130 mM) and both high H 2 and CH 4 concentrations (approx. 10 mM) probably result from subcritical phase separation and thermal decomposition of sedimentary organic matter. Microbiota and fauna were generally similar to other sites in the OT, although with some different characteristics. In terms of microbiota, the H 2 -rich vent fluids in Neuschwanstein chimney resulted in the dominance of hydrogenotrophic chemolithoautotrophs such as Thioreductor and Desulfobacterium . For fauna, the dominance of the deep-sea mussel Bathymodiolus aduloides is surprising given other nearby vent sites are usually dominated by B. platifrons and/or B. japonicus , and a sponge field in the periphery dominated by Poecilosclerida is unusual for OT vents. Our insights from the Yokosuka site implies that although the distribution of animal species may be linked to depth, the constraint is perhaps not water pressure and resulting chemical properties of the vent fluid but instead physical properties of the surrounding seawater. The potential significance of these preliminary results and prospect for future research on this unique site are discussed.

New records of submarine hydrothermal activity in middle part of the Okinawa Trough

1997 ◽  
Vol 42 (7) ◽  
pp. 574-577 ◽  
Author(s):  
Yiyang Zhao ◽  
Shikui Zhai ◽  
Rongzhi Li ◽  
Fengye Li ◽  
Aiguo Gao ◽  
...  
Keyword(s):  
New Records ◽  
Okinawa Trough ◽  
Hydrothermal Activity ◽  
Middle Part ◽  
The Okinawa Trough ◽  
Submarine Hydrothermal Activity

scholarly journals Geochemical evidence for hydrothermal activity in the Okinawa trough.

1988 ◽  
Vol 22 (3) ◽  
pp. 107-114 ◽  
Author(s):  
Jun-ichiro Ishibashi ◽  
Toshitaka Gamo ◽  
Hitoshi Sakai ◽  
Yukihiro Nojiri ◽  
George Igarashi ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Activity ◽  
Geochemical Evidence ◽  
The Okinawa Trough

Characteristics of hydrocarbons in hydrothermal products of the Clam hydrothermal field from the Okinawa trough

2021 ◽  
Vol 167 ◽  
pp. 112277
Author(s):  
Xin Huang ◽  
Chao Huang ◽  
Yali Qi ◽  
Xiaoyuan Wang ◽  
Hansheng Cao
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Field ◽  
The Okinawa Trough

Element enrichment and U-series isotopic characteristics of the hydrothermal sulfides at Jade site in the Okinawa Trough

2009 ◽  
Vol 52 (7) ◽  
pp. 913-924 ◽  
Author(s):  
ZhiGang Zeng ◽  
ShaoXiong Yu ◽  
XueBo Yin ◽  
XiaoYuan Wang ◽  
GuoLiang Zhang ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
The Okinawa Trough ◽  
Element Enrichment ◽  
Hydrothermal Sulfides

EXPRESS: A Piecewise Model for In Situ Raman Measurement of the Chlorinity of Deep-Sea High-Temperature Hydrothermal Fluids

2021 ◽  
pp. 000370282199911
Author(s):  
meng ge ◽  
Lianfu Li ◽  
Xin Zhang ◽  
Zhendong Luan ◽  
Zengfeng Du ◽  
...  
Keyword(s):  
High Temperature ◽  
Deep Sea ◽  
Okinawa Trough ◽  
Peak Position ◽  
Hydrothermal Fluids ◽  
Calibration Model ◽  
The Okinawa Trough ◽  
Temperature Ranges ◽  
Piecewise Model ◽  
C 50

The chlorinity of deep-sea hydrothermal fluids, representing one of the crucial deep-sea hydrothermal indicators, indicates the degree of deep phase separation of hydrothermal fluids and water/rock reactions. However, accurately measuring the chlorinity of high-temperature hydrothermal fluids is still a significant challenge. In this paper, a piecewise chlorinity model to measure the chlorinity of high-temperature hydrothermal fluids was developed based on the OH stretching band of water, exhibiting an accuracy of 96.20%. The peak position, peak area ratio and F value were selected to establish the chlorinity piecewise calibration model within the temperature ranges of 0-50°C, 50-200°C and 200-300°C. Compared with that of the chlorinity calibration model built based on a single parameter, the accuracy of this piecewise model increased by approximately 4.83-12.33%. This chlorinity calibration model was applied to determine the concentrations of Cl for high-temperature hydrothermal fluids in the Okinawa Trough hydrothermal field.

Helium isotopes in volcanic rocks from the Okinawa Trough-impact of volatile recycling and crustal contamination

2016 ◽  
Vol 51 ◽  
pp. 376-386 ◽  
Author(s):  
Zenghui Yu ◽  
Shikui Zhai ◽  
Kun Guo ◽  
Yonghua Zhou ◽  
Tong Zong
Keyword(s):  
Okinawa Trough ◽  
Volcanic Rocks ◽  
Crustal Contamination ◽  
Helium Isotopes ◽  
The Okinawa Trough
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