土壤和围岩地球化学组成及气候对洞穴滴水水化学的影响——以湖北清江和尚洞为例Impact of Soil,Bedrock Geochemical Composition and Climate on Hydrochemistry of Cave Drip Water:A Case Study of Heshang Cave,Qingjiang,Hubei
王明达;胡超涌;周炼;朱昌杰;
摘要(Abstract):
大气降水渗入土壤,穿过围岩,将气候与地表环境信息导入洞穴滴水,最终被洞穴沉积物所记录,因而研究土壤、围岩与洞穴滴水的地球化学组成及3者之间的联系对了解气候和环境信号的传递以及石笋古环境信息的正确解译十分重要。通过对比清江地区和尚洞上覆土壤、围岩与滴水的元素及锶同位素N(87Sr)/N(86Sr)地球化学组成特征,进而调查土壤和围岩对洞穴滴水水化学的影响。结果表明:滴水的n(Mg)/n(Ca)、n(Ba)/n(Ca)、n(Sr)/n(Ca)及N87Sr)/N(86Sr)介于土壤和围岩之间,说明滴水物质组成来自土壤和围岩的混合;滴水的n(S)/n(Ca)大于土壤和围岩,说明有第三端元的混入,可能是大气硫沉降的结果。通过模型计算可知,土壤和围岩对和尚洞滴水各元素组成的贡献并不相同,贡献的相对大小不仅与元素本身的地球化学性质有关,而且随气候和环境而发生变化。
关键词(KeyWords): 微量元素;87Sr/86Sr;滴水;物源;和尚洞;清江
基金项目(Foundation): 国家自然科学基金重点项目(40531004)
作者(Author): 王明达;胡超涌;周炼;朱昌杰;
Email:
DOI:
参考文献(References):
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