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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

孙呈慧,窦衍光,赵京涛,等. 冲绳海槽沉积物孔隙水地球化学特征及其指示意义[J]. 海洋学报,2022,44(5):102–112 doi: 10.12284/hyxb2022081
引用本文: 孙呈慧,窦衍光,赵京涛,等. 冲绳海槽沉积物孔隙水地球化学特征及其指示意义[J]. 海洋学报,2022,44(5):102–112 doi: 10.12284/hyxb2022081
Sun Chenghui,Dou Yanguang,Zhao Jingtao, et al. 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
Citation: Sun Chenghui,Dou Yanguang,Zhao Jingtao, et al. 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

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
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

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

  • 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。
  • 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]

    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

    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

    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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  • 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

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