贵州省灰岩分布区土壤镉地球化学基线研究  

GEOCHEMICAL BASELINE OF SOIL CADMIUM IN THE LIMESTONE AREA OF GUIZHOU PROVINCE

作　　者：马骅 蔡大为 朱要强 MA Hua;CAI Da-wei;ZHU Yao-qiang(Guizhou Geological Environment Monitoring Institute,Guiyang 550001,China)

机构地区：[1]贵州省地质环境监测院,贵州贵阳550001

出　　处：《地质与资源》2024年第3期397-402,共6页Geology and Resources

基　　金：贵州省财政资金项目“贵州省耕地质量地球化学调查评价”(黔耕调2017-04)。

摘　　要：为判别贵州省灰岩分布区土壤中Cd的元素来源,分析土壤中Cd的富集程度,按标准化方法获取了全省灰岩分布区不同地质年代形成的土壤Cd地球化学基线值,并进行地质累积指数评价.结果表明:二叠系和石炭系灰岩发育形成的土壤Cd基线值明显高于灰岩其他地层发育形成土壤.将土壤Cd基线值与岩石Cd平均含量对比分析显示,岩石自然风化是贵州灰岩发育土壤中Cd元素的主要来源.根据地质累积指数评价结果,贵州省灰岩分布区土壤Cd污染程度总体处于较低水平.To identify the source and analyze the enrichment degree of soil Cd in the limestone distribution areas of Guizhou Province,the geochemical baseline values of soil Cd formed in different geological ages are obtained by standardized method,and the geoaccumulation index is used for evaluation.The results show that the baseline values of Cd in the soil formed from the Permian and Carboniferous limestone are obviously higher than those of the soil formed from limestone of other geological ages.The comparison between the baseline values of Cd in soil and average content of Cd in rocks shows that the naturally weathered rocks are the main source of soil Cd in limestone areas.According to the evaluation results of geoaccumulation index,the pollution of soil Cd in limestone areas of Guizhou is generally at a low level.

关 键 词：镉 土壤 地球化学基线 灰岩 地质累积指数 贵州省 

分 类 号：P595[天文地球—地球化学]