流域风化过程稳定锶同位素的分馏与示踪

doi:10.11867/j.issn.1001-8166.2020.058

地球科学进展 ›› 2020, Vol. 35 ›› Issue (7): 691 -703. doi: 10.11867/j.issn.1001-8166.2020.058

流域风化过程稳定锶同位素的分馏与示踪

赖正(

),苏妮(

),吴舟扬,连尔刚,杨承帆,李芳亮,杨守业

同济大学海洋地质国家重点实验室，上海 200092

收稿日期:2020-04-03 修回日期:2020-06-03 出版日期:2020-07-10
通讯作者: 苏妮 E-mail:zhenglai@tongji.edu.cn;nsu@tongji.edu.cn
基金资助:
青岛海洋科学与技术国家实验室开放基金项目“多同位素示踪极端事件对东海沉积物源汇关键过程的影响”(QNLM2016ORO0211);国家自然科学基金项目“山溪性入海河流物源变异及对气候事件的响应”(41776062)

Stable Strontium Isotopic Fractionation During Chemical Weathering in Drainage Basins: Mechanisms and Applications

Zheng Lai( ),Ni Su( ),Zhouyang Wu,Ergang Lian,Chengfan Yang,Fangliang Li,Shouye Yang

State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Received:2020-04-03 Revised:2020-06-03 Online:2020-07-10 Published:2020-08-21
Contact: Ni Su E-mail:zhenglai@tongji.edu.cn;nsu@tongji.edu.cn
About author:Lai Zheng(1995-), male, Ganzhou City, Jiangxi Province, Master student. Research areas include marine geology. E-mail: zhenglai@tongji.edu.cn
Supported by:
the Open Financial Grant from the Qingdao National Laboratory for Marine Science and Technology “Multi-isotope tracing of sediment source-to-sink process in East China Sea affected by extreme event”(QNLM2016ORP0211);The National Natural Science Foundation of China “Heterogeneity in mountainous river sources with the response to climate event”(41776062)

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稳定锶同位素（ δ^88/86Sr）是近年来新兴的一种非传统稳定同位素，应用其示踪大陆风化过程与海洋锶循环已成为学术界一个研究热点。目前稳定锶同位素质谱测试精度可优于0.03‰，自然界不同地质体 δ^88/86Sr的变化范围为-3.65‰~1.68‰。研究发现，流域风化过程中原生矿物的差异性溶解、次生矿物的形成与吸附作用、碳酸钙沉淀以及生物作用都会使得流体相 δ^88/86Sr升高，而固体相 δ^88/86Sr降低，从而导致稳定锶同位素在河流溶解态和颗粒态具有不同的地球化学行为。河流沉积物 δ^88/86Sr随着风化强度的增强而降低，具有示踪流域化学风化强度的潜力。同时，当前亟需深入研究表生风化过程中稳定锶同位素的分馏机制及制约因素，这是运用河水 δ^88/86Sr示踪流域化学风化的关键，也为深入理解全球海洋锶循环提供借鉴。

关键词: 稳定锶同位素, 流域风化, 分馏机制, 地球化学示踪

The new non-traditional stable strontium (Sr) isotope has aroused great attention from academic scholars in terms of the continental weathering and marine Sr cycle. The analytical precision of stable Sr isotope using mass spectrometry is better than 0.03‰. The compiled δ⁸⁸/ ⁸⁶Sr values vary from -3.65‰ to 1.68‰ in natural reservoirs. Recent findings indicate that multiple processes can cause stable Sr isotope fractionation in Earth surface, including the incongruent dissolution of primary minerals, the formation and adsorption of secondary minerals, the precipitation of calcium carbonate, and the biological cycling. These processes lead to higher δ⁸⁸/ ⁸⁶Sr in the liquid phase and lower δ⁸⁸/ ⁸⁶Sr in the solid phase, and thus result in different geochemical behavior of stable Sr isotopes in water and sediment during the weathering processes. The δ⁸⁸/ ⁸⁶Sr values of river sediment decrease with the increase of weathering intensity, which has the potential to indicate chemical weathering intensity. Meanwhile, further study on the fractionation mechanisms and constraints of stable Sr isotopes in river water plays an important role in tracing chemical weathering processes within the watershed, which will lead to a better understanding of the global ocean Sr cycle.

Key words: δ^88/86Sr, Chemical weathering, Fractionation mechanism, Geochemical tracing

中图分类号:

P597

图1 标准海水 IAPSO的稳定 Sr同位素组成的不同质谱测试方法对比
部分数据误差表示方法由2SE转化为2SD

Fig.1 Comparison of δ^88/86Sr values for IAPSO measured by different mass spectrometry methods
Errors of 2SE are converted to 2SD

图2 自然界储库中稳定 Sr同位素组成
竖轴为硅酸盐地球的 δ ^88/86Sr平均组成（0.27‰~0.30‰），据参考文献[ 15 , 16 , 18 ]修改；数据来自参考文献[3~5,7,9,11~22,25~27,29~31,35,36,38,41~53,55,56,65~68]

Fig.2 Stable strontium isotopic compositions in
natural reservoirs
The solid line represents the δ ^88/86Sr values of the Bulk Silicate Earth average (0.27‰~0.30‰), modified after references[15,16,18]; Data source from references[3~5,7,9,11~22,25~27,29~31,35,36,38,41~53,55,56,65~68]

图3 不同流域各类型样品中 δ^88/86Sr和 Sr浓度变化范围
淡黄色条带为硅酸盐地球的 δ ^88/86Sr平均组成（0.27‰~0.30‰），据参考文献[ 15 , 16 , 18 ]修改；数据来源：木兰溪数据来自参考文献[ 78 ]，西江数据来自参考文献[ 43 ]，Hou-Ku河数据来自参考文献[ 44 ]，Cleddau河数据来自参考文献[ 50 ]，Lemon Creek冰川流域数据来自参考文献[ 46 ]，Akuliarusiarsuup Kuua河数据来自参考文献[ 49 ]

Fig.3 Variation of δ^88/86Sr values and Sr contents in various types of samples
The light yellow band represents the δ ^88/86Sr values of the Bulk Silicate Earth average (0.27‰~0.30‰), modified after references[15,16,18]. Data source: Mulan River data from reference[ 78 ], Xijiang River data from reference[ 43 ], Hou-Ku River data from reference[ 44 ], Cleddau River data from reference[ 50 ], Lemon Creek glacier data from reference[ 46 ], Akuliarusiarsuup Kuua River data from reference[ 49 ]

图4 世界不同河流水体 δ^88/86Sr vs. Sr/Na关系图
阴影区域表示世界不同河流 δ ^88/86Sr的变化范围 ^{[

52
]}；碳酸盐岩和硅酸盐岩端元的 δ ^88/86Sr分别为-0.05‰~0.23‰和0.08‰~0.46‰；两端元的Sr/Na(摩尔浓度比）据参考文献[ 86 ]修改；数据来源：（a）来自参考文献[ 43 ]；（b）来自参考文献[ 44 ]；（c）来自参考文献[ 50 ]；（d）来自参考文献[ 46 ]；（e）来自参考文献[ 45 ]；（f）来自参考文献[ 49 ]；（g）来自参考文献[ 52 ]

Fig.4 Plot of δ^88/86Sr versus Sr/Na for river waters worldwide
The shaded area shows the range in riverine δ ^88/86Sr values worldwide ^{[

52
]}. The δ ^88/86Sr values of carbonate and silicate endmembers are -0.05‰~0.23‰ and 0.08‰~0.46‰, respectively. The Sr/Na ratios (molar ratio) of the two end members modified after reference[ 86 ]. Data source: (a) Data from reference[ 43 ]; (b) Data from reference[ 44 ]; (c) Data from reference[ 50 ]; (d) Data from reference[ 46 ]; (e) Data from reference[ 45 ]; (f) Data from reference[ 49 ]; (g) Data from reference[ 52 ]

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