大洋溶解铁的物质来源及其同位素示踪

陈天宇; 蔡平河; 李伟强; 杨涛; 凌洪飞; 季峻峰

doi:10.16562/j.cnki.0256-1492.2019070501

大洋溶解铁的物质来源及其同位素示踪

1.
南京大学地球科学与工程学院，内生金属矿床成因机制国家重点实验室海洋地球化学研究中心，南京 210023

2.
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，青岛 266061

3.
国家海洋局海洋沉积与环境地质重点实验室，青岛 266061

4.
厦门大学海洋与地球学院，近海环境科学国家重点实验室，厦门 361005

5.
南京大学地球科学与工程学院，表生地球化学教育部重点实验室，南京 210023

基金项目: 西太平洋地球系统多圈层相互作用重大计划培育项目“上新世以来西太平洋沉积铁同位素演化研究”（91858105）；国家海洋局海洋沉积与环境地质重点实验室开放基金资助项目“晚第四纪北太平洋深水铁同位素演化重建：对大洋铁循环的新约束”（MASEG201711）；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创新团队资助项目“利用西太平洋铁锰结壳微量金属重建新生代火山喷气历史”（MGQNLM-TD201701）

详细信息

作者简介: 陈天宇（1986—），男，教授，博导，主要从事深海地球化学和古海洋研究， E-mail：tianyuchen@nju.edu.cn

中图分类号: P736.21

收稿日期: 2019-07-05

修回日期: 2019-08-11

刊出日期: 2019-10-25

The sources of dissolved iron in the global ocean and isotopic tracing

1.
Center for Marine Geochemistry Research, State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

2.
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China

3.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, MNR, Qingdao 266061, China

4.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

5.
Ministry of Education Lab for Surficial Geochemistry Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

Received Date: 05 July 2019

Revised Date: 11 August 2019

Publish Date: 25 October 2019

摘要

摘要:
铁（Fe）作为海洋初级生产所必需的微量和限制性营养元素影响着海洋生物群落结构、生态功能以及碳循环，理解溶解Fe的物质来源及其对气候变化的响应具有重要的科学意义。早期研究多强调风尘输入是维持大洋Fe循环的主要机制。近年来，随着海水Fe分析数据的积累,尤其是痕量元素及其同位素海洋生物地球化学循环研究计划（GEOTRACES）的开展，陆架沉积物和热液活动所释放Fe的贡献开始越来越受到重视。尽管如此，不同物源对开阔大洋溶解Fe的影响依然存在相当的不确定性。以海水溶解Fe的化学组分为出发点，强调有机配体对大洋Fe循环的决定性作用，综述了不同来源Fe的通量估计和第四纪大洋Fe来源的研究争议。铁同位素为理解大洋Fe的物源演变提供了新的工具。讨论了不同物源的Fe同位素特征，并提出结合沉积物的活动性Fe同位素和组分研究可能为理解过去陆架-热液活动-风尘输出与输运Fe的机制提供全新视角。
- 溶解铁 /
- 物源 /
- 铁同位素 /
- 热液 /
- 风尘
Abstract:
Iron is an essential trace element to oceanic primary productivity, which may influence the structure of marine biological community, ecological function, and carbon cycle. It is therefore of great importance to understand the sources and supply of dissolved Fe to the ocean and its responses to the global climate change. Early studies often emphasize dust input as the mechanism to maintain oceanic Fe cycling. In recent years, with the increase in Fe data, especially along with the launch of GEOTRACES program, the important role of dissolved Fe released from continental shelf sediments and hydrothermal activities has been highlighted. Nevertheless, there still remain considerable uncertainties regarding the contribution of Fe to the open ocean from different sources. Our review begun with characterizing the chemical speciation of dissolved Fe, especially of organic ligand in oceanic Fe cycling, and then presented flux estimation of different Fe sources as well as the debates regarding the oceanic Fe fertilization during the time of Quaternary. Iron isotopes provide a new tool for studying the evolution of Fe sources. We have discussed the Fe isotope signatures of different sources, and proposed that the combination of isotopes and speciation analysis of sedimentary reactive Fe might provide a new perspective in understanding the mechanism of Fe export and transport from continental shelf, hydrothermal activity, and dust in the past.
- dissolved Fe /
- sources /
- Fe isotopes /
- hydrothermal /
- dust

HTML全文

图 1 海水Fe赋存分类示意图

Figure 1.

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图 2 全球大洋表层海水（0～50 m）溶解Fe浓度分布^{[6, 52]}

Figure 2.

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图 3 北大西洋GA03剖面（左）^[66]和东太平洋GP16剖面（右）^[68]的溶解Fe浓度与δ⁵⁶Fe分布

Figure 3.

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图 4 南大洋钻孔PS75/059-2（太平洋侧）^[85]和ODP-1090（大西洋侧）^[86]碎屑通量、生物生产率以及大气CO₂浓度在最近50万年的变化^[94]

Figure 4.

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图 5 以大西洋-南大洋剖面为例的海水Fe生物地球化学循环与物源示意图（据文献[1]修改）

Figure 5.

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大洋溶解铁的物质来源及其同位素示踪

作者简介: 陈天宇（1986—），男，教授，博导，主要从事深海地球化学和古海洋研究， E-mail：tianyuchen@nju.edu.cn

The sources of dissolved iron in the global ocean and isotopic tracing

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