云南东川基岩区风化壳成土过程中磁化率与粒度关系探究  

Relationship between magnetic susceptibility and grain size during the formation of weathering crust in Dongchuan bedrock area

作　　者：王松 方维萱[1,2] 郭玉乾[2] WANG Song;FANG Weixuan;GUO Yuqian(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Laboratory of Mine Ecological Environment Resource Innovation,China Non-Ferrous Metals Resource Geological Survey,Beijing 100012)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]有色金属矿产地质调查中心矿山生态环境资源创新实验室,北京100012

出　　处：《矿产与地质》2020年第5期953-961,共9页Mineral Resources and Geology

摘　　要：以东川5种基岩风化壳—土壤剖面作为研究对象,探究在成壤过程粒度与磁化率特征,以期为矿山生态建设做相关依据,进行相关分析后认为5种基岩形成的土壤磁化率总体较高,以辉绿岩-碱玄岩为成土母岩的土壤磁化率与土壤分层有很好的对应关系,白云岩-板岩-辉绿辉长岩则无明显对应关系。土壤中发育最差土壤为板岩,发育最好的为辉绿辉长岩。辉绿岩-辉绿辉长岩-碱玄岩均以原生粗磁性颗粒为主,板岩表层以及白云岩则以次生磁性颗粒为主。相关性分析表明辉绿岩-辉绿辉长岩各粒级与磁化率无明显相关性,碱玄岩-板岩-白云岩中粒级与磁化率具有明显的相关性,显著性水平达0.05,可建立线性回归方程作为土壤中某一粒级范围的含量指标。Taking the weathered crust-soil profile of five kinds of bedrocks in Dongchuan area as the research objects,the characteristics of grain size and magnetic susceptibility during the process of soil formation are discussed in order to provide a relevant reference for the mine ecological construction.According to the relevant analysis,the soil magnetic susceptibility of the five types of bedrocks is generally considered to be higher,the soil magnetic susceptibility of diabase-alkali basalt as the parent rock has a good correspondence with soil stratification.Howerver the dolomite-slate-diabase and gabbro has no obvious correspondence with soil stratification.The worst-developed soil is from slate,and the best-developed soil is from diabase gabbro.There are mainly the primary coarse magnetic particles in diabase-diabase gabbro-alkali basalt,while there are mainly the secondary magnetic particles in the slate surface and dolomite.Correlation analysis shows that there is no significant correlation between the particle size and magnetic susceptibility of diabase-diabase gabbro.The correlation coefficients of the medium grain sizes and the magnetic susceptibility in the basalt-slate-dolomite at the significance level of 0.05.A linear regression equation can be established as an content index of the particle size in the soil.

关 键 词：岩相学 风化壳 土壤 磁化率 基岩 矿山生态建设 东川地区 云南 

分 类 号：P631.325[天文地球—地质矿产勘探]