贵州黑色页岩土壤地球化学特征  

Geochemical Characteristics of Black-Shale Soils in Guizhou Province,China

作　　者：杨连升 周明忠[1] 熊康宁 杨桦 张迪 姚成斌 张先荣 YANG Lian-sheng;ZHOU Ming-zhong;XIONG Kang-ning;YANG Hua;ZHANG Di;YAO Cheng-bin;ZHANG Xian-rong(School of Geographic and Environmental Sciences,Guizhou Normal University,Guiyang 550001;Research Institute of Karst,Guizhou Normal University,Guiyang 550001)

机构地区：[1]贵州师范大学地理与环境科学学院,贵阳550001 [2]贵州师范大学喀斯特研究院,贵阳550001

出　　处：《矿物岩石地球化学通报》2020年第5期1023-1037,共15页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家“十三五”重点研发课题(2016YFC0502601);贵州省研究生教育创新计划项目(黔教研合GZS字[2016]04)。

摘　　要：为刻画贵州黑色页岩土壤的地球化学特征及进一步探讨黑色页岩关键带的元素迁移富集规律,本文以贵州小竹流水、黑沙坡、戈仲伍和翁会四条典型剖面的黑色页岩土壤为研究对象,分别采用X荧光光谱仪(XRF)和等离子质谱仪(ICPMS)测定土壤的主、微量元素。结果表明,四条剖面黑色页岩的风化程度均高于同区域的碳酸盐岩土壤。在风化-成土过程中,黑色页岩土壤明显富集Al、Fe、K、Ti、P而亏损Si、Ca、Na、Mg、Mn等主量元素。小竹流水、黑沙坡和戈仲伍剖面土壤的重金属污染元素组合类型为V-As-Mo-Ag-Cd-Tl-U,翁会剖面为Cu-As-Ag-Ba-W;四条剖面黑色页岩土壤具有相似的稀土元素配分模式,即轻稀土右倾、重稀土平坦;还具有相似的高场强元素分布特征。在黑色页岩风化-成土过程中,高场强元素Zr、Hf、Nb、Ga、Ge、Ta和金属元素Be、In、Bi、Th等的活动性较弱,而Ba、Cr、Y、Sc、REE等元素的活动性较强。In order to characterize geochemical characteristics of black shale soils in Guizhou and to further explore the migration and enrichment laws of elements in the Critical Zone of black shale,this study collected black shale soil samples as research objects from four typical black shale sections,Xiaozhuliushui,Heishapo,Gezhongwu and Wenghui,in Guizhou,and measured contents of major and trace elements of these soil samples by XRF and ICP-MS,respectively.The results showed that weathering degrees of black shale soils at four sections were generally higher than those of carbonate soils in corresponding regions.In the process of black shale weathering to soil formation,major elements(Al,Fe,K,Ti and P)were obviously enriched while other major elements(Si,Ca,Na,Mg and Mn)were depleted for all studied black shale soils.The element combinations of heavy metal pollution were V-As-Mo-Ag-Cd-Tl-U in Xiaozhuliushui,Heishapo and Gezhongwu sections and were Cu-As-Ag-Ba-W in the Wenghui section.The distribution patterns of rare earth elements in studied black shale soils were characterized by the right-leaning light rare earth elements and flat heavy rare earth elements pattern,and the distribution characteristics of high field strength elements were similar in all black shale soil samples from different sections.It was suggested high field strength elements(Zr,Hf,Nb,Ga,Ge and Ta)and metal elements(Be,In,Bi and Th)were less active while other elements(Ba,Cr,Y,Sc and REE)were more active during the process of black shale weathering to soil formation.

关 键 词：黑色页岩土壤 地球化学特征 风化-成土 重金属污染 元素赋存关系 

分 类 号：P595[天文地球—地球化学]