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地球科学进展  2017, Vol. 32 Issue (8): 885-898    DOI: 10.11867/j.issn.1001-8166.2017.08.0885
应用地球化学专辑     
珠三角平原区第四系剖面重金属分布特征及其影响因素
唐志敏1, 2, 侯青叶1, *, 游远航3, 杨忠芳1, 李括4
1.中国地质大学(北京)地球科学与资源学院,北京 100083;
2.中国地质调查局南京地质调查中心, 江苏 南京 210016;
3.广东省地质调查院,广东 广州 510080;
4.中国地质科学院地球物理地球化学勘查研究所,河北 廊坊 065000
Distribution Characteristics and Influencing Factors of Heavy Metals in Pearl River Delta Quaternary Boreholes
Tang Zhimin1, 2, Hou Qingye1, *, You Yuanhang3, Yang Zhongfang1, Li Kuo4
1.School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2.Nanjing Center,China Geological Survey,Nanjing 210016,China;
3.Guangdong Institute of Geological Survey, Guangzhou 510080,China;
4.Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Hebei Langfang 065000, China
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摘要:

选取珠江三角洲冲积平原区4个不同沉积相带的第四系岩心做元素全量分析,并对4种重金属进行了赋存形态分数分析,揭示了珠江三角洲第四系元素地球化学特征主要受物源和沉积环境的控制。不同沉积环境下物源的影响程度不同,物源在三角洲平原相的沉积环境下影响强度最大,在海陆交互强烈的沉积环境下,物源的影响减弱,海陆交互作用的影响增强。不同重金属元素由于自身化学性质的差异,其对沉积环境的敏感程度有所不同。研究区Cd富集显著,且其活性态比例最高、潜在生态风险最大;而As,Hg和Pb的富集程度较弱,且As和Hg主要以残渣态的形式存在,Pb主要以残渣态和铁锰氧化物态为主,它们的生态风险相对较低。不同的沉积环境下pH等理化指标对Cd形态的影响不同,Cd的活动态主要与pH和淋滤系数有关。

关键词: 物源珠江三角洲海陆交互作用第四系重金属    
Abstract:

This paper analyzed contents and geochemical fractions of four heavy metals in four Quaternary boreholes from different sedimentary areas in Pearl River Delta. The results revealed that the geochemical features of heavy metals were controlled by geological provenance and sedimentary environment. The contribution rates of geological sources showed differentiation in four sedimentary environments. In delta plain sedimentary environment, geological sources were the most predominant. In the sea land interaction sedimentary environment, the control of the geological source factor was weakened. The effect of land-sea interaction became more important. Due to different chemical properties of heavy metals, they showed distinct sensitivities to sedimentary environment. Cadmium (Cd) was enriched significantly in the study areas. Mobile fraction of Cd possessed the highest proportion. Potential ecological risk of Cadmium was the highest among heavy metals. Asenic, mercury and lead were enriched weakly. Arsenic and Mercury were dominated by residual fraction. Lead was mainly composed of residual and Fe-Mn oxidation fraction. Their potential ecological risks were relatively lower. In different sedimentary environment, physicochemical parameters had various effects on Cadmium geochemical fraction such as pH. The mobile fraction of Cd was mainly correlated with pH and leaching coefficient.

Key words: Pearl River Delta    Provenance    Land-sea interaction    Quaternary    Heavy metal.
收稿日期: 2017-02-28 出版日期: 2017-08-20
ZTFLH:  P595  
基金资助:

中国地质调查局地质大调查项目“珠江三角洲土壤重金属地球化学成因与风险评价”(编号:12120115050401); 痕迹科学与技术公安部重点实验室开放课题(编号:2015FMKFKT03)资助

通讯作者: 侯青叶(1978-),女,山西临汾人,副教授,主要从事区域地球化学和环境地球化学研究.E-mail:qingyehou@126.com   
作者简介: 唐志敏(1992-),男,四川绵阳人,硕士研究生,主要从事环境地球化学研究.E-mail:tangzmh@163.com
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引用本文:

唐志敏, 侯青叶, 游远航, 杨忠芳, 李括. 珠三角平原区第四系剖面重金属分布特征及其影响因素[J]. 地球科学进展, 2017, 32(8): 885-898.

Tang Zhimin, Hou Qingye, You Yuanhang, Yang Zhongfang, Li Kuo. Distribution Characteristics and Influencing Factors of Heavy Metals in Pearl River Delta Quaternary Boreholes. Advances in Earth Science, 2017, 32(8): 885-898.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2017.08.0885        http://www.adearth.ac.cn/CN/Y2017/V32/I8/885

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