地球科学进展

地球科学进展 ›› 2014, Vol. 29 ›› Issue (7): 835 -843. doi: 10.11867/j.issn.1001-8166.2014.07.0835

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长江河水 87Sr/ 86Sr值的季节性变化及其指示意义：以长江大通站为例 1
罗超 1( ), 郑洪波 2, *( ), 吴卫华 1, 杨守业 3   
  1. 1. 南京大学表生地球化学教育部重点实验室,南京大学地球科学与工程学院,江苏 南京 210023
    2. 南京师范大学地理科学学院,江苏 南京210023
    3. 同济大学海洋地质国家重点实验室,长江水环境教育部重点实验室, 上海,200092
  • 出版日期:2014-07-10
  • 通讯作者: 郑洪波 E-mail:chaoluo.niki@gmail.com;zhenghb@njnu.edu.cn
  • 基金资助:
    中国科学院战略性先导科技专项（B类）“青藏高原多层圈相互作用及其资源环境效应”（编号：XDB03020300）;中国地质调查局项目“中国矿物碳汇试验研究”（编号：12120113005400）资助

Temporal Variation in Sr and 87Sr/ 86Sr of Yangtze River: An Example from Datong Hydrological Station

Chao Luo 1( ), Hongbo Zheng 2( ), Weihua Wu 1, Shouye Yang 3   

  1. 1. Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
    2. School of Geography Science, Nanjing Normal University, Nanjing 210023, China
    3. State Key Laboratory of Marine Geology, Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China
  • Online:2014-07-10 Published:2014-07-10
全文 ( 5 ) 下载PDF ( 1690 )

在长江下游大通水文站进行了为期1年的每2周1次的水样采样,分析测试其Sr含量及其同位素组成。结果表明,长江溶解Sr浓度在1.74~2.92 μmol/L之间变化,87Sr/86Sr值的范围为0.710125~ 0.710965,河水Sr含量及同位素组成出现明显的季节性差异,表现为从洪水季节开始87Sr/86Sr值逐步升高,至12月达到最高值后缓慢下降并在下一个洪水季节到来时升高。研究认为,下游河水87Sr/86Sr值的季节性变化主要受流域降雨的时空变化所导致的物源相对贡献比例变化控制。受季风气候影响,当洪水期短期强降雨集中在上游地区时,强烈的风化使得上游贡献增多,致使下游河水Sr同位素组成迅速降低。采样期间（2011年1~5月）中下游的持久干旱致使中下游硅酸盐岩风化对河水Sr贡献减少从而造成河水同位素组成持续降低。同时,基于全年样品数据计算得出长江溶解Sr同位素组成的入海特征值为0.710628,Sr通量为1.9×109mol/a。研究结果表明河水Sr同位素组对流域极端气候的响应较好,可为今后使用历史时期物质Sr同位素研究解释极端气候变化奠定基础。

关键词: 长江, Sr同位素, 物源

Temporal variation of dissolved 87Sr/86Sr in the Yangtze River is poorly understood compared to other Tibetan rivers. In this study, dissolved Sr and 87Sr/86Sr were measured from a temporal series of water samples collected biweekly at Datong Hydrological Station over a period of one year. Our results show that Sr concentration in the Yangtze River ranges from 1.74 to 2.92 μmol/L with 87Sr/86Sr of 0.710125 to 0.710965. The Sr concentration and 87Sr/86Sr shows a distinct seasonal variation, with a general increase in 87Sr/86Sr ratios from summer to winter and some fluctuations during July and December, then followed by a gradually decrease till the next rainy season. The seasonal variation results from the variation of contributions from different sub-basin due to the spatially and seasonally variable rainfall across the basin. During the flood season, more contribution from upper reach (low 87Sr/86Sr values) due to the strong rainfall decreases the 87Sr/86Sr ratio at lower reach. While the severe drought which happened in the middle-lower reaches (high 87Sr/86Sr values) from January to May explains the decrease in the later part of the data by the decrease of the contribution from middle-lower reaches. The discharge weighted annual 87Sr/86Sr and annual Sr flux of the Yangtze River based on the time series data are 0.710628 and 1.9×109 mol/a, respectively. It was also indicated that dissolved 87Sr/86Sr in the Yangtze River is well correlated to the extreme climate events and might contribute to our explanation for reconstructing past climatic changes by using 87Sr/86Sr ratios of the sedimentary record in the delta .

Key words: The Yangtze River, Sr isotope, Provenance.

中图分类号: 

图1 (a)长江流域岩性图（修改自文献[34]）; (b)大通站采样剖面及采样点示意图
Fig. 1 (a) Sketch map of the rock types in the Yangtze River drainage basin (Modified from Reference [34]); (b) Sampling profile at Datong and star indicate position of samples
图2 长江大通站水样Sr浓度及 87Sr/ 86Sr组成的季节性变化趋势图
Fig. 2 Temporal variations in Sr concentration and 87Sr/ 86Sr of the river water at Datong
表1 长江大通站水样Sr同位素组成
Table 1 Dissolved Sr concentration and isotopic composition at Datong
样号 T/℃ pH 流量/(m3/s) Sr/(μmol/L) 87Sr/86Sr 2σ
2010-06-12 23.00 9.09 46300 2.23 0.710453 7
2010-07-08 27.40 8.00 56200 1.74 0.710747 4
2010-07-26 27.23 8.51 62850 2.28 0.710506 7
2010-08-11 29.66 7.68 56425 2.10 0.710622 7
2010-08-29 28.29 7.79 43325 2.24 0.710718 5
2010-09-12 26.46 7.75 42775 2.40 0.710727 6
2010-09-29 24.30 7.79 38375 2.16 0.710769 4
2010-10-18 21.56 7.82 28050 1.92 0.710886 7
2010-11-06 17.20 7.85 22950 2.21 0.710838 4
2010-11-22 16.74 7.79 15225 2.44 0.710763 7
2010-12-10 14.79 7.71 12850 2.62 0.710719 8
2010-12-27 9.32 8.12 18125 1.95 0.710965 5
2011-01-21 7.25 7.90 14200 2.25 0.710822 5
2011-02-23 9.05 8.12 13925 2.67 0.710640 5
2011-03-11 10.23 8.01 13225 2.48 0.710593 4
2011-03-28 12.27 8.13 18125 2.42 0.710580 3
2011-04-13 14.43 7.99 14125 2.57 0.710522 2
2011-04-29 19.15 7.93 14875 2.50 0.710433 2
2011-05-21 22.77 7.75 19275 2.48 0.710296 6
2011-06-09 Nd Nd 19700 2.92 0.710125 6
2011-06-28 26.00 7.58 45375 2.17 0.710397 4
平均值* 2.32 0.710625
图3 大通站单个采集河水样品年Sr通量与基于全年样品年Sr通量的相对误差
Fig. 3 Uncertainty between annual Sr fluxes based on time series data and single sampling
表2 本次研究中长江流量加权平均Sr含量, 87Sr/ 86Sr及 87Sr ex与其他研究比较
Table 2 Dissolved Sr concentration, 87Sr/ 86Sr, Sr flux and excess 87Sr ex in the Yangtze River from this study and other studies
流域 采样时间 Sr 87Sr/86Sr Sr flux 87Srex 数据来源
(μmol/L) mol/ a mol a-1
长江* 一年 2.32 0.7106 1.9×109 3.1×106 本次研究
长江 - 2.42 0.71071 2.45×109 4.19×106 (Gaillardet et al., 1999)[ 37 ]
长江 1997年10月 2.28 0.7108 2.12×109 3.82×106 (Wang et al., 2009)[ 17 ]
长江 2006年8月 0.7115 (Chetelat et al., 2008)[ 34 ]
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