冲绳海槽中南部柱状沉积物氧化还原敏感元素赋存机理与环境指示意义

许晓燕; 窦衍光; 张勇; 陈晓辉; 孙治雷; 白凤龙; 翟滨; 王利波; 邹亮

doi:10.12284/hyxb2022186

冲绳海槽中南部柱状沉积物氧化还原敏感元素赋存机理与环境指示意义

doi: 10.12284/hyxb2022186

许晓燕^{1, 2,},
窦衍光^{2, 3, ,},
张勇^{2, 4},
陈晓辉^{2, 4},
孙治雷^{2, 4},
白凤龙^{2, 4},
翟滨^{2, 4},
王利波^{2, 4},
邹亮^{2, 4}

1.
中国地质大学（武汉）海洋学院，湖北武汉 430074
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

基金项目: 国家自然科学基金（41776077）；国家海洋局国际合作项目（GASI-GEOGEO-04）；中国地质调查局地质调查专项（DD20190205，DD20221710）。

详细信息

作者简介:
许晓燕（1997-），女，广东省汕头市人，主要从事海洋地质研究。E-mail: 1114323281@qq.com

通讯作者:
窦衍光（1979-），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⁺1
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出版历程
- 收稿日期: 2022-02-09
- 修回日期: 2022-06-22
- 网络出版日期: 2022-07-12
- 刊出日期: 2022-10-01

Occurrence mechanism of redox sensitive elements in columnar sediments in South Central Okinawa Trough and their environmental implications

Xu Xiaoyan^{1, 2
,},
Dou Yanguang^{2, 3
, ,},
Zhang Yong^{2, 4},
Chen Xiaohui^{2, 4},
Sun Zhilei^{2, 4},
Bai Fenglong^{2, 4},
Zhai Bin^{2, 4},
Wang Libo^{2, 4},
Zou Liang^{2, 4}

1.
College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, 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

摘要

摘要: 沉积物中氧化还原敏感元素（Redox Sensitive Element，RSE）含量变化是上覆水体氧化还原环境良好的替代指标。本文通过冲绳海槽中南部两个柱状沉积物（深度：30 cm）粒度、总有机碳、总氮及其同位素含量和氧化还原敏感元素含量等指标，探究复杂环境背景下冲绳海槽柱状沉积物中RSE的赋存机理与环境指示意义。研究发现，柱状沉积物中除了Cr亏损，其他RSE均显示有不同程度的富集。“粒控效应”对冲绳海槽柱状沉积物的RSE含量影响较小；分析可知，海水表层生产力是影响沉积物氧化还原环境的主要因素，通过Mn（氢）氧化物的吸附或解吸附作用实现RSE的富集与亏损。δCe、V/Cr、Ni/Co和V/（V+Ni）等指标指示沉积物整体处于氧化−弱氧化环境。沉积物中Mn元素通过还原作用以Mn²⁺形式向上扩散，在25～30 cm处被含氧间隙水氧化富集形成锰峰，指示柱状沉积物0～25 cm处为氧化环境，25～30 cm处为弱氧化环境。
- 环境指示意义 /
- 氧化还原敏感元素 /
- Mn（氢）氧化物 /
- 柱状沉积物 /
- 冲绳海槽
Abstract: Changes in the content of redox sensitive elements (RSE) in sediments are good surrogate indicators for the redox environment of the overlying water. The RSE in the columnar sediments under complex environmental backgrounds through the grain size, total organic carbon and total nitrogen and its isotopes contents, and redox sensitive elements contents of the two columnar sediments (30 cm) in South Central Okinawa Trough are explored in this paper. And to explore the occurrence mechanism and environmental indication significance. The study found that in addition to the depletion of Cr in the columnar sediments, other RSEs showed different degrees of enrichment. The “grain size effect” has little effect on the RSE content of columnar sediments in the Okinawa Trough; analysis and judgment show that seawater surface productivity is the main factor affecting the redox environment of sediments, and RSE is achieved through the adsorption or desorption of Mn (hydrogen) oxides enrichment and loss. Indicators such as δCe, V/(V+Ni), Ni/Co and V/Cr indicate that the sediment is in an oxic-dysoxic water environment. The Mn element in the sediment diffuses upward in the form of Mn²⁺ through reduction, and is oxidized and enriched by oxygen-containing interstitial water at 25−30 cm to form a manganese peak. The 0−25 cm columnar sediment is in an oxic water column, and 25−30 cm is in a dysoxic water column.
- environmental implications /
- redox sensitive element /
- Mn (hydrogen) oxide /
- columnar sediments /
- Okinawa Trough

HTML全文

图 1 东海冲绳海槽洋流体系^[31]及样品位置

Fig. 1 Ocean current system^[31] and sample location in the Okinawa Trough of the East China Sea

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图 2 DYBB27（a）和DYB228（b）柱状沉积物组分含量、平均粒径、TOC含量、TN含量、δ¹³C值、δ¹⁵N值和海洋自生有机质组分占比（f_m）的垂向特征

Fig. 2 Vertical characteristics of component content, average particle size, TOC content, TN content, δ¹³C value, δ¹⁵N value and f_m in the columnar sediments of DYBB27 (a) and DYB228 (b)

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图 3 DYBB27和DYB228柱状沉积物中RSE/Al比值的垂向特征

Fig. 3 Vertical characteristics of RSE/Al ratio in the columnar sediments of DYBB27 and DYB228

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图 4 DYBB27和DYB228柱状沉积物RSE_EF的垂向特征

Fig. 4 Vertical characteristics of RSE_EF in the columnar sediments of DYBB27 and DYB228

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图 5 DYBB27和DYB228柱状沉积物不同氧化还原指标的变化特征（U_auth为自生铀含量）

Fig. 5 Variation characteristics of different oxidation indicators in columnar sediments of DYBB27 and DYB228 (U_auth is the content of authigenic uranium)

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图 6 DYBB27（a）和DYB228（b）柱状沉积物中粉砂含量和RSE/Al比值的相关性

纵坐标a值除了Mn/Al比值为1，其他RSE/Al比值为4

Fig. 6 Correlation between silt content and RSE/Al ratios in the columnar sediments of DYBB27 (a) and DYB228 (b)

The value of ordinate a is 1 (Mn/Al), and the other RSE/Al are 4

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图 7 DYBB27（深蓝色）和DYB228（蓝色）柱状沉积物中生源钡（Ba_bio）与TOC含量和RSE/Al比值的相关性

Fig. 7 Correlations of bio-barium (Ba_bio) content with TOC content and RSE/Al ratios in the columnar sediments of DYBB27 (dark blue) and DYB228 (blue)

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图 8 DYBB27 （a）和DYB228 （b）柱状沉积物中Mn/Al比值和RSE/Al比值的相关性

Fig. 8 Correlation of Mn/Al ratio and RSE/Al ratios in the columnar sediments of DYBB27 (a) and DYB228 (b)

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图 9 Ba_bio含量和MnO/Al₂O₃比值的相关性

Fig. 9 Correlations of Ba_bio content and MnO/Al₂O₃ ratio

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图 10 DYBB27和DYB228柱状沉积物中Ni/Co和V/Cr比值分布

其他数据引自文献[89]

Fig. 10 Distribution of Ni/Co and V/Cr ratios in columnar sediments of DYBB27 and DYB228

Other data are quoted from reference [89]

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图 11 DYBB27和DYB228柱状沉积物中V/（V+Ni）和Mn/（Al×10）比值的相关性

Fig. 11 Correlation of V/(V+Ni) and Mn/(Al×10) ratios in columnar sediments of DYBB27 and DYB228

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表 1 冲绳海槽中南部不同钻孔沉积物的AMS¹⁴C测年数据对比

Tab. 1 Comparison of AMS¹⁴C dating data of sediments from different drillings in the South Central Okinawa Trough

样品编号	纬度	经度	水深/m	深度/cm	距今平均校正年龄/（cal a）	参考文献
DYBB27	26.196 9°N	125.233 8°E	1 323	29～30	140	本研究
DYB228	26.866 3°N	125.955 0°E	1 277	29～30	67.5	本研究
MD012404	26.656 7°N	125.820 8°E	1 397	14.5	749	文献[39]
OKT-3	26.018 0°N	125.282 0°E	1 792	28	1 090	文献[40]
OKI-151	26.110 0°N	125.520 0°E	2 013	30	1 135	文献[41]
A7	27.817 2°N	126.968 6°E	1 264	32～36	2 690	文献[42]
C14	28.659 7°N	127.320 0°E	1 100	35～37.5	673	文献[43]
Oki02	26.073 6°N	125.200 7°E	1 612	52～54	2 891	文献[44]
OKT12-2	26.050 0°N	125.340 0°E	1 924.53	57	3 147.5	文献[45]

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表 2 DYBB27和DYB228柱状沉积物RSE/Al比值与粒径的相关性分析

Tab. 2 Correlation analysis of RSE/Al ratio and particle size in the columnar sediments of DYBB27 and DYB228

样品	指标	U/Al	V/Al	Cr/Al	Ni/Al	Co/Al	Cu/Al	Fe/Al	Mn/Al
DYBB27	平均粒径	−0.177	−0.283	0.067	−0.092	0.285	−0.114	0.140	−0.079
	砂粒径	0.442*	0.281	−0.037	0.036	−0.393*	−0.005	−0.384*	−0.018
	粉砂粒径	−0.607**	−0.196	−0.053	0.034	0.369*	0.198	0.539**	0.129
	黏土粒径	0.175	−0.125	0.114	−0.089	0.058	−0.240	−0.166	−0.137
DYB228	平均粒径	0.554**	−0.198	−0.416*	−0.245	−0.069	−0.216	−0.335	−0.056
	砂粒径	−0.100	0.128	0.016	−0.203	−0.240	−0.193	0.034	−0.259
	粉粒粒径	−0.440*	0.042	0.424*	0.517**	0.375*	0.508**	0.340	0.390*
	黏土粒径	0.748**	−0.197	−0.635**	−0.538**	−0.291	−0.027	−0.532**	−0.293
注：*表示在0.01级别（双尾），相关性显著；表示在0.05级别（双尾），相关性显著。

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表 3 DYBB27和DYB228柱状沉积物RSE/Al比值与TOC和Ba_bio的相关性分析

Tab. 3 Correlation analysis of RSE/Al ratios with TOC and Ba_Bio in the columnar sediments of DYBB27 and DYB228

样品	指标	Ba_bio含量/10⁻⁶	U/Al	V/Al	Cr/Al	Ni/Al	Co/Al	Cu/Al
DYBB27	TOC含量/%	0.147	−0.093	−0.014	−0.053	0.100	0.182	−0.036
DYBB27	Ba_bio含量/10⁻⁶	1	−0.017	0.686**	0387*	0.844**	0.749**	0.248
DYB228	TOC含量/%	0.206	−0.427*	0.501**	0.195	0.039	0.360	0.447*
DYB228	Ba_bio含量/10⁻⁶	1	−0.282	−0.312	0.068	0.759**	0.858**	0.383*
注：*表示在0.01级别（双尾），相关性显著；表示在0.05级别（双尾），相关性显著。

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表 4 DYBB27和DYB228柱状沉积物RSE/Al比值与Fe/Al和Mn/Al比值的相关性分析

Tab. 4 Correlation analysis of RSE/Al ratios with Fe/Al and Mn/Al ratios in the columnar sediments of DYBB27 and DYB228

站位	指标	U/Al	V/Al	Cr/Al	Ni/Al	Co/Al	Cu/Al
DYBB27	Fe/Al	−0.677**	−0.181	−0.006	−0.126	0.032	0.053
	Mn/Al	−0.248	0.666**	0.274	0.972**	0.821**	0.361
DYB228	Fe/Al	−0.672**	0.391*	0.442*	0.153	−0.139	0.299
	Mn/Al	−0.333	−0.229	0.089	0.896**	0.901**	0.529**
注：*表示在0.01级别（双尾），相关性显著；表示在0.05级别（双尾），相关性显著。

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