scholarly journals ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough

2014 ◽  
pp. 369-386 ◽  
Author(s):  
Taisei Fujiwara ◽  
Shin Toyoda ◽  
Ai Uchida ◽  
Jun-ichiro Ishibashi ◽  
Shun’ichi Nakai ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Esr Dating ◽  
Sulfide Deposits ◽  
Sea Floor ◽  
Hydrothermal Sulfide ◽  
The Okinawa Trough

Influence of Th-rich mineral phases on U–Th radioactive disequilibrium ages of sulfide deposits from the Okinawa Trough

2018 ◽  
Vol 486 ◽  
pp. 61-72
Author(s):  
S. Nakai ◽  
A. Takamasa ◽  
T. Fujiwara ◽  
S. Toyoda ◽  
J. Ishibashi ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Sulfide Deposits ◽  
Radioactive Disequilibrium ◽  
Mineral Phases ◽  
The Okinawa Trough

Characteristics of the Environment Around a Massive Sea-Floor Sulfide Area in the Okinawa Trough

2011 ◽  
Author(s):  
Hiroshi Ishida ◽  
Nobuhiro Maeda ◽  
Tetsuya Miwa ◽  
Tetsuo Yamazaki ◽  
Yoshihisa Shirayama ◽  
...  
Keyword(s):  
Hydrothermal Vent ◽  
Okinawa Trough ◽  
Euphotic Zone ◽  
Bottom Layer ◽  
Massive Sulfide ◽  
Baseline Survey ◽  
Surrounding Area ◽  
Sea Floor ◽  
The Okinawa Trough ◽  
Ca 50

It is necessary to carry out a proper environmental impact assessment for not only the sea-floor massive sulfide area where a special hydrothermal-vent chemosynthetic ecosystem is observed, but also its surrounding area. This paper shows provisional results of the environmental baseline survey conducted at the Izena Cauldron in 2009. Environmental conditions differed clearly between inside and outside of the Cauldron. In the inside area, a high turbidity layer was recognized at ca. 200 m above the sea-floor. In the bottom layer close to the hydrothermal active region, water temperature was slightly higher than the surrounding area with the lower pH, higher concentrations of both carbon dioxide and the dissolved Mn. Inside the Cauldron, the sulfur isotope ratio of the sediment close to a sea-floor massive sulfide was similar to that of the hydrothermal sulfate. In addition, heavy metal concentrations of the sediment were higher inside than outside of the Cauldron. Especially, concentrations of Cd, As and Hg were as high as poisonous levels. These results show the possibility that most of the chemical materials derived from hydrothermal vent remain in the Cauldron. Pelagic shrimps of the family Oplophoridae were widely distributed in the bottom layer inside the Cauldron. The biomass of benthic shrimps which belong to infraorder Caridea was higher inside than outside of the Cauldron. These higher biomass was likely caused by the abundant organic matter. This hypothesis was reinforced by the result of the mooring sediment trap (placed at ca. 50 m above the seafloor) experiment, which demonstrated that the settling particle in the Cauldron was supplied from not only the euphotic zone but also the hydrothermal-vent ecosystem.

scholarly journals Two Processes of Anglesite Formation and a Model of Secondary Supergene Enrichment of Bi and Ag in Seafloor Hydrothermal Sulfide Deposits

2021 ◽  
Vol 10 (1) ◽  
pp. 35
Author(s):  
Zhigang Zeng ◽  
Zuxing Chen ◽  
Haiyan Qi
Keyword(s):  
Okinawa Trough ◽  
Volcanic Rocks ◽  
Hydrothermal Systems ◽  
Sulfide Deposits ◽  
The Okinawa Trough ◽  
Supergene Enrichment ◽  
Seawater Environment ◽  
Back Arc ◽  
Enrichment Process

The in situ element concentrations and the sulfur (S), and lead (Pb) isotopic compositions in anglesite were investigated for samples from seafloor hydrothermal fields in the Okinawa Trough (OT), Western Pacific. The anglesite grains are of two kinds: (1) low Pb/high S primary hydrothermal anglesite (PHA), which is formed by mixing of fluid and seawater, and (2) high Pb/low S secondary supergene anglesite (SSA), which is the product of low-temperature (<100 °C) alteration of galena in the seawater environment. The Ag and Bi in the SSA go through a second enrichment process during the formation of high Pb/low S anglesite by galena alteration, indicating that the SSA and galena, which may be the major minerals host for considerable quantities of Ag and Bi, are potentially Ag-Bi-enriched in the back-arc hydrothermal field. Moreover, REEs, S and Pb in the OT anglesite are likely to have been leached by fluids from local sub-seafloor volcanic rocks and/or sediments. A knowledge of the anglesite is useful for understanding the influence of volcanic rocks, sediments and altered subducted oceanic plate in hydrothermal systems, showing how trace metals behave during the formation of secondary minerals.

scholarly journals OSL Dating of Sea Floor Sediments at the Okinawa Trough

2014 ◽  
pp. 617-620
Author(s):  
Vaidehi Varma ◽  
Shin Toyoda ◽  
Yusuke Isono ◽  
Ai Uchida ◽  
Debabrata Banerjee ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Osl Dating ◽  
Sea Floor ◽  
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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