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Geochemical characteristics and indicative significance of pore water in the sediments of Okinawa Trough
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Chenghui Sun1, 2, 5, Yanguang Dou2, 3, *, Jingtao Zhao2, 4, Zhilei Sun2, 4, Fenglong Bai2, 4, Feng Cai2, 4, Qing Li2, 4, Bin Zhai2, 4, Libo Wang2, 4, Liang Zou2, 4
Haiyang Xuebao | 2022, 44(5) : 102 - 112
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Haiyang Xuebao | 2022, 44(5): 102-112
• Article •
Geochemical characteristics and indicative significance of pore water in the sediments of Okinawa Trough
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Chenghui Sun1, 2, 5, Yanguang Dou2, 3, *, Jingtao Zhao2, 4, Zhilei Sun2, 4, Fenglong Bai2, 4, Feng Cai2, 4, Qing Li2, 4, Bin Zhai2, 4, Libo Wang2, 4, Liang Zou2, 4
Affiliations
  • 1. Chinese Academy of Geological Sciences, Beijing 100037, China
  • 2. China Geological Survey Qingdao Institute of Marine Geology, Qingdao 266237, China
  • 3. Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  • 4. Laboratory for Marine Mineral Resource, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  • 5. China University of Geosciences (Beijing), Beijing 100083, China
Published: 2022-05-01 doi: 10.12284/hyxb2022081
Outline
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Through the analysis of the δ13C, δ18O, δ11B, δ37Cl isotopes and Cl−, ${\rm{SO}}_4^{2-} $, K+, and Na+ ion index in the sediment pore water of the core GSW1 in the East China Sea outer Slope-Okinawa Trough, the changes of early diagenesis, fluid sources, migration and oxidation environment of sediments were discussed. The results show that the pore water dissolved inorganic carbon of the core GSW1 mainly comes from sea water and organic matter, the concentration of ${\rm{SO}}_4^{2-} $ decreases more gently with depth, and the concentration of Cl− is much lower than seawater. The sulfate consumption in the surface sediments of this pore is mainly caused by organoclastic sulfate reduction (OSR) controlled, anaerobic oxidation of methane (AOM) occurs in deeper layers below 4 m. The H2S produced by OSR diffuses upwards and is enriched and oxidized, which is the main factor that causes the 110−360 cm ${\rm{SO}}_4^{2-} $ content to not significantly decrease. The overall trend of pore water ${\rm{SO}}_4^{2-} $ concentration decreases with depth, indicating that the deposition environment of core GSW1 has gradually changed from an oxidizing and sub-oxidizing environment to a reducing environment. The vertical changes of δ11B and δ37Cl fluctuate greatly. On the one hand, they are affected by the degradation of organic matter in the early diagenesis stage, and they may also be related to the diffusion of pore fluid and sediment/pore water interaction.

sulfate reduction  /  fluid migration  /  isotope and ion concentration  /  pore water  /  East China Sea outer Slope-Okinawa Trough
Chenghui Sun, Yanguang Dou, Jingtao Zhao, Zhilei Sun, Fenglong Bai, Feng Cai, Qing Li, Bin Zhai, Libo Wang, Liang Zou. Geochemical characteristics and indicative significance of pore water in the sediments of Okinawa Trough[J]. Haiyang Xuebao, 2022 , 44 (5) : 102 -112 . DOI: 10.12284/hyxb2022081
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Article Info
doi: 10.12284/hyxb2022081
  • Receive Date：2021-08-23
  • Online Date：2026-02-01
  • Published：2022-05-01
Article Data
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History
  • Received：2021-08-23
  • Revised：2021-09-11
Funding
Affiliations
    1. Chinese Academy of Geological Sciences, Beijing 100037, China
    2. China Geological Survey Qingdao Institute of Marine Geology, Qingdao 266237, China
    3. Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
    4. Laboratory for Marine Mineral Resource, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
    5. China University of Geosciences (Beijing), Beijing 100083, China
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表12种不同金属材料的力学参数
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Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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