Geochemical characteristics of hydrothermal fluids at Hatoma Knoll in the southern Okinawa Trough

2016 ◽  
Vol 50 (6) ◽  
pp. 493-525 ◽  
Author(s):  
Tomohiro Toki ◽  
Michihiro Itoh ◽  
Daigo Iwata ◽  
Shogo Ohshima ◽  
Ryuichi Shinjo ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Fluids ◽  
Geochemical Characteristics ◽  
Southern 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 Metallic mineralization associated with pillow basalts in the Yaeyama Central Graben, Southern Okinawa Trough, Japan

2006 ◽  
Vol 3 (0) ◽  
pp. 1-8 ◽  
Author(s):  
Makoto Watanabe ◽  
Kenichi Hoshino ◽  
Ryota Shiokawa ◽  
Yuki Takaoka ◽  
Hideo Fukumoto ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Southern Okinawa Trough

scholarly journals Rare earth element geochemistry of sediments from the southern Okinawa Trough since 3 ka: Implications for river-sea processes and sediment source

2019 ◽  
Vol 11 (1) ◽  
pp. 929-947
Author(s):  
Siyi Hu ◽  
Zhigang Zeng ◽  
Xue Fang ◽  
Bowen Zhu ◽  
Xiaohui Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Okinawa Trough ◽  
Sediment Source ◽  
Sediment Sources ◽  
Terrigenous Sediments ◽  
Southern Okinawa Trough ◽  
Ree Fractionation ◽  
Siliciclastic Sediments

Abstract The sediment sources in the southern Okinawa trough (SOT) are still controversial and few studies have focused on the effects of transport processes on the elemental composition of initial terrigenous materials. Here we present rare earth element (REE) and trace element data on siliciclastic sediments from 14C age-dated Core S3, which was collected from the SOT, to provide reliable evidence for illustrating the modified effects of marine environments on terrigenous sediments deposited at different stages and exposing changes in sediment source over the past 3 ka. Compared with bulk sediments, the siliciclastic sediments in S3 have more variable REE fractionation parameters and lower middle REE (MREE) contents. Our REE data indicate that during river-sea processes, MREE-enriched fractions such as Fe–Mn oxides and carbonate were added to the original terrigenous sediments before deposition, weakening the degree of REE fractionation in the initial sediments; thus, care should be taken when using REE data from bulk samples to decipher source changes. The temporal changes in sediment source in S3 can be broadly identified based on the REE fractionation parameters of the residual fractions, and the results are largely consistent with the findings obtained by heavy mineral examinations. Units 1 and 3 are dominated by reworked shelf sediments of Changjiang origin,while the proportion of Taiwan-derived sediment is notably higher in Units 2 and 4. The sediment flux of Taiwan origin in the SOT was much smaller than previously thought. Huanghe-derived sediments and volcanic materials did not contribute significantly to the late Holocene sedimentation in the SOT. The large variations in sediment sources in S3 were possibly caused by changes in transport patterns driven by time-dependent changes in oceanic currents.

Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass

2018 ◽  
Vol 37 (2) ◽  
pp. 14-24 ◽  
Author(s):  
Kun Guo ◽  
Shikui Zhai ◽  
Zenghui Yu ◽  
Zhigang Zeng ◽  
Xiaoyuan Wang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Okinawa Trough ◽  
Major And Trace Elements ◽  
Geochemical Characteristics ◽  
Basaltic Glass ◽  
The Okinawa Trough
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