石灰土物质来源的判别──以黔北、黔中几个剖面为例  

IDENTIFICATION OF ORIGIN OF LIMESTONE SOIL──CASE STUDY OF PROFILES IN CENTRAL AND NORTH GUIZHOU

作　　者：刘秀明[1] 王世杰[1] 冯志刚[1] 孙承兴[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《土壤》2004年第1期30-36,共7页Soils

基　　金：国家自然科学基金(批准号:49833002)项目资助;国家"九五"科技攻关项目(96-920-04-02-12);中国科学院"西部之光"项目

摘　　要：传统看法认为石灰土是碳酸盐岩风化作用的产物,然而由于碳酸盐岩风化成土的特殊性,在宏观上难以直接甄别土层与母岩的关联性,以至引发出了很大的物源争议。因此,物质来源判别将是石灰土研究的关键内容。基于此,本文选择黔北遵义官坝、安顺天龙和贵阳花溪上水村4个石灰土剖面为实例,进行矿物组合、地球化学特征和粒度分布特征对比分析,旨在对分布十分广泛的贵州省石灰土的物质来源进行判别。结果显示:各剖面土层与下伏的碳酸盐岩具有明显的物源继承关系,石灰土是碳酸盐岩风化作用-酸不溶物残留、堆积的产物。Limestone soil is an important type of soil, covering about 17.5% of the total of the soils in Guizhou. According to definition of the Chinese Soil Taxonomy and genetic classification, limestone soil must be derived from weathered bedrock carbonate rock. However, it is hard to determine origin of limestone soils only on the basis of field observation, or the lithologic characters of carbonate rock in layer cited by the soil classification. So, origin of limestone soil has long been a controversial topic. In this paper, further exploration is made by taking four limestone soil profiles as example, which are developed over bedrocks of dolomitite and limestone and located in upland in the central, north Guizhou. The coherence of mineral, Ti/Al, Al/Zr, Ti/Zr,Nb/Ti, REE and particle-size characteristics implies that there are inherited relationship among the bedrock, insoluble residues of bedrock and soil layer. It can be concluded that limestone soils indeed originate from insoluble residues of bedrock carbonate rock.

关 键 词：石灰土 酸不溶物 碳酸盐岩 贵州 

分 类 号：P595[天文地球—地球化学] S159[天文地球—地质学]