冲绳海槽沉积物孔隙水地球化学特征及其指示意义

孙呈慧; 窦衍光; 赵京涛; 孙治雷; 白凤龙; 蔡峰; 李清; 翟滨; 王利波; 邹亮

doi:10.12284/hyxb2022081

冲绳海槽沉积物孔隙水地球化学特征及其指示意义

doi: 10.12284/hyxb2022081

孙呈慧^{1, 2, 5,},
窦衍光^{2, 3, ,},
赵京涛^{2, 4},
孙治雷^{2, 4},
白凤龙^{2, 4},
蔡峰^{2, 4},
李清^{2, 4},
翟滨^{2, 4},
王利波^{2, 4},
邹亮^{2, 4}

1.
中国地质科学院，北京 100037
2.
中国地质调查局青岛海洋地质研究所，山东青岛 266237
3.
青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室，山东青岛 266237
4.
青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室，山东青岛 266237
5.
中国地质大学（北京），北京 100083

基金项目: 国家自然科学基金（41776077）；国家海洋局国际合作项目“亚洲大陆边缘的古海洋与古地理演化”（GASI GEOGEO04）；中国地质调查局地质调查专项（DD20190205，DD20221710）

详细信息

作者简介:
孙呈慧（1998-），女，山东省青岛市人，主要从事海洋地质研究。E-mail: 1023413289@qq.com

通讯作者:
窦衍光，男，研究员，主要从事海洋沉积地球化学研究。 E-mail: douyangaung@gmail.com

中图分类号: P736.4
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-23
- 修回日期: 2021-09-11
- 网络出版日期: 2022-06-15
- 刊出日期: 2022-06-15

Geochemical characteristics and indicative significance of pore water in the sediments of Okinawa Trough

Sun Chenghui^{1, 2, 5
,},
Dou Yanguang^{2, 3
, ,},
Zhao Jingtao^{2, 4},
Sun Zhilei^{2, 4},
Bai Fenglong^{2, 4},
Cai Feng^{2, 4},
Li Qing^{2, 4},
Zhai Bin^{2, 4},
Wang Libo^{2, 4},
Zou Liang^{2, 4}

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

摘要

摘要: 通过对东海外陆坡–冲绳海槽GSW1孔沉积物孔隙水δ¹³C、δ¹⁸O、δ¹¹B、δ³⁷Cl同位素和Cl⁻、${\rm{SO}}_4^{2-} $、K⁺、Na⁺等离子指标的分析，探讨了沉积物早期成岩作用、流体来源、迁移和氧化环境的变化。研究发现，GSW1孔孔隙水溶解无机碳主要来自海水和有机质，${\rm{SO}}_4^{2-} $浓度随深度下降比较平缓，Cl⁻浓度远低于海水，该孔表层沉积物中硫酸盐消耗主要由有机质硫酸盐还原作用（OSR）所控制，甲烷厌氧氧化作用（AOM）发生在4 m以下更深的层位。OSR产生的H₂S向上扩散富集并被氧化，是导致GSW1孔110～360 cm处 ${\rm{SO}}_4^{2-} $浓度未明显下降的主要因素。孔隙水${\rm{SO}}_4^{2-} $浓度整体随着深度增加呈减小的趋势，表明GSW1孔沉积环境由氧化、次氧化环境逐渐转变为还原环境。δ¹¹B、δ³⁷Cl值垂向变化波动较大，一方面受到早期成岩阶段有机质降解的影响，也可能与孔隙流体扩散以及沉积物/孔隙水相互作用有关。
- 硫酸盐还原 /
- 流体迁移 /
- 同位素和离子浓度 /
- 孔隙水 /
- 东海外陆坡−冲绳海槽
Abstract: 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

HTML全文

图 1 东海陆架–冲绳海槽环流体系和GSW1孔位置^[36]

Fig. 1 Circulation system of the East China Sea outer Slope-Okinawa Trough and core GSW1 location^[36]

下载: 全尺寸图片幻灯片

图 2 GSW1孔沉积物孔隙水离子垂向变化

Fig. 2 Ionvertical changes of pore water in the sediments of core GSW1

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图 3 GSW1孔沉积物孔隙水硼、氯、氢、氧、碳同位素垂向变化

Fig. 3 Vertical changes of boron, chlorine, hydrogen, oxygen, and carbon isotope in the pore water of core GSW1 sediments

下载: 全尺寸图片幻灯片

图 4 GSW1孔沉积物孔隙水中碳氧同位素组成的相关性

Fig. 4 Correlation between carbon isotope and oxygen isotope in the pore water of core GSW1 sediments

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