Two-stage influences of hydrothermal fluids on pumice near the Iheya North hydrothermal field, Okinawa Trough

2018 ◽  
Vol 36 (4) ◽  
pp. 393-404 ◽  
Author(s):  
Yuxiang Zhang ◽  
Zhigang Zeng ◽  
Haiyan Qi ◽  
Xuebo Yin ◽  
He Li ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Fluids ◽  
Hydrothermal Field ◽  
Two Stage

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

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.

scholarly journals Radiocarbon content of carbon dioxide and methane in hydrothermal fluids of Okinawa Trough vents

2020 ◽  
Vol 54 (3) ◽  
pp. 129-138
Author(s):  
Shinsuke Kawagucci ◽  
Yohei Matsui ◽  
Gretchen L. Früh-Green
Keyword(s):  
Carbon Dioxide ◽  
Okinawa Trough ◽  
Hydrothermal 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
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