Mineral nitrogen isotope signature in clay minerals formed under high ammonium environment conditions in sediment associated with ammonium-rich sediment-hosted hydrothermal system

Jaeguk Jo, Toshiro Yamanaka, Tomoki Kashimura, Yusuke Okunishi, Yoshihiro Kuwahara, Isao Kadota, Youko Miyoshi, Junichiro Ishibashi, Hitoshi Chiba

研究成果: ジャーナルへの寄稿記事

1 引用 (Scopus)

抄録

The shallow-seafloor Wakamiko hydrothermal field in Kagoshima Bay, Japan, has been characterized by high ammonium contents (~17 mM) in the discharge fluid. The sediment layer covering the field also contained a high concentration of ammonium in the pore fluids. The fluid chemistry suggests that the high concentration was attributed to whether mixing with hydrothermal fluid or the mineralization of organic matter. The occurrence of sediments such as smectite, illite and mica has been reported, and is associated with hydrothermal activity. Those 2:1 clay minerals can fold ammonium as mineral nitrogen (MN) in their interlayers. Extracted clay fractions from the sediment core samples obtained from the field were mainly composed of smectite. It contained a small amount of MN and its d15N values reflected that of pore fluid ammonium in the case of a high ammonium (≫4 mM) environment. On the other hand, d15N values of MN in the low ammonium (£4 mM) environment were similar to those of the associated adsorbed organic nitrogen. The high ammonium environment associated with hydrothermal activity is expected to enhance formation of ammonium-bearing clay minerals, and then the d15N value of MN fixed in the clay minerals is possibly preserved a signal of pore fluid ammonium.

元の言語英語
ページ(範囲)317-333
ページ数17
ジャーナルGEOCHEMICAL JOURNAL
52
発行部数4
DOI
出版物ステータス出版済み - 1 1 2018

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Nitrogen Isotopes
nitrogen isotopes
hydrothermal systems
nitrogen isotope
hydrothermal system
Clay minerals
Ammonium Compounds
clays
Minerals
clay mineral
Sediments
sediments
ammonium
minerals
signatures
mineral
fluids
nitrogen
sediment
Nitrogen

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Mineral nitrogen isotope signature in clay minerals formed under high ammonium environment conditions in sediment associated with ammonium-rich sediment-hosted hydrothermal system. / Jo, Jaeguk; Yamanaka, Toshiro; Kashimura, Tomoki; Okunishi, Yusuke; Kuwahara, Yoshihiro; Kadota, Isao; Miyoshi, Youko; Ishibashi, Junichiro; Chiba, Hitoshi.

:: GEOCHEMICAL JOURNAL, 巻 52, 番号 4, 01.01.2018, p. 317-333.

研究成果: ジャーナルへの寄稿記事

Jo, Jaeguk ; Yamanaka, Toshiro ; Kashimura, Tomoki ; Okunishi, Yusuke ; Kuwahara, Yoshihiro ; Kadota, Isao ; Miyoshi, Youko ; Ishibashi, Junichiro ; Chiba, Hitoshi. / Mineral nitrogen isotope signature in clay minerals formed under high ammonium environment conditions in sediment associated with ammonium-rich sediment-hosted hydrothermal system. :: GEOCHEMICAL JOURNAL. 2018 ; 巻 52, 番号 4. pp. 317-333.
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abstract = "The shallow-seafloor Wakamiko hydrothermal field in Kagoshima Bay, Japan, has been characterized by high ammonium contents (~17 mM) in the discharge fluid. The sediment layer covering the field also contained a high concentration of ammonium in the pore fluids. The fluid chemistry suggests that the high concentration was attributed to whether mixing with hydrothermal fluid or the mineralization of organic matter. The occurrence of sediments such as smectite, illite and mica has been reported, and is associated with hydrothermal activity. Those 2:1 clay minerals can fold ammonium as mineral nitrogen (MN) in their interlayers. Extracted clay fractions from the sediment core samples obtained from the field were mainly composed of smectite. It contained a small amount of MN and its d15N values reflected that of pore fluid ammonium in the case of a high ammonium (≫4 mM) environment. On the other hand, d15N values of MN in the low ammonium (£4 mM) environment were similar to those of the associated adsorbed organic nitrogen. The high ammonium environment associated with hydrothermal activity is expected to enhance formation of ammonium-bearing clay minerals, and then the d15N value of MN fixed in the clay minerals is possibly preserved a signal of pore fluid ammonium.",
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AU - Jo, Jaeguk

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AU - Okunishi, Yusuke

AU - Kuwahara, Yoshihiro

AU - Kadota, Isao

AU - Miyoshi, Youko

AU - Ishibashi, Junichiro

AU - Chiba, Hitoshi

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