内蒙古准和热木音苏木地球化学基准值特征研究

发布时间：2018-09-06 14:38

【摘要】：内蒙古准和热木音苏木地区属于低山丘陵草原区,这里地广人稀,没有工业污染,受到人类活动影响较小,是研究地球化学基准值的理想之地。通过开展区域土壤地球化学调查,以两千多个土壤样品数据为基础,用反复剔除迭代法获得了该区土壤六种重金属元素(Cr、Pb、As、Cu、Ni、Zn)的地球化学基准值。通过划分统计单元,确定各单元的地球化学基准值,在此基础上用面积加权法确定全区地球化学基准值,并研究全区地球化学基准值特征。另外,为了验证在低山丘陵地区的干涸湖泊盆地采集的样品是否能够代表全区样品,本文采集了湖底沉积物土壤样品,确定它的地球化学基准值,将其与全区的土壤地球化学基准值作对比。以下是本文取得的研究结果:1、用迭代法获得了研究区土壤六种重金属元素的地球化学基准值,其中As为4.75mg/kg,Cr为18.55 mg/kg,Pb为11.30 mg/kg,Cu为4.01 mg/kg,Zn为16.42 mg/kg,Ni为4.08 mg/kg。2、通过分析各统计地质单元的地球化学基准值,各元素的地球化学基准值较高的有湖积区、下白垩统大磨拐河组、下白垩统白音高老组、石炭系宝力高庙组一段;地球化学基准值较低的有石炭系侵入岩区;冲洪积区的基准值与全区的基准值较为接近。3、用面积加权法确定全区的地球化学基准值与迭代法确定全区的地球化学基准值很接近。4、确定湖底沉积物中六种元素的地球化学基准值,将其与全区的地球化学基准值相比较,其中As、Pb的含量与全区相应元素的基准值比较接近,Cr、Cu、Zn、Ni的含量高于全区相应元素的基准值。在本研究区采集的湖底沉积物样品中有些元素,如As、Pb,可以代表全区样品中相应元素的基准值;有些元素如Cr、Cu、Zn、Ni,不能代表全区样品中相应元素的基准值。
[Abstract]:Nei Mongol quasi-and-Xue-Sumu area belongs to the lowland and hilly grassland region. It is an ideal place for the study of geochemical datum because of its wide population, no industrial pollution and little influence by human activities. Based on more than two thousand soil samples, the geochemical reference values of six heavy metal elements (Cr,Pb,As,Cu,Ni,Zn) in soils in this area were obtained by repeated culling iterative method. The geochemical datum values of each unit are determined by dividing the statistical units. On this basis, the area weighting method is used to determine the geochemical reference values of the whole region, and the characteristics of the geochemical reference values in the whole region are studied. In addition, in order to verify whether the samples collected in the dry lake basin in the low mountain and hilly region can represent the samples of the whole region, the soil samples of the lake bottom sediments are collected and its geochemical reference values are determined. It is compared with the soil geochemical reference value of the whole area. The following is the result of this study: 1. The geochemical reference values of six heavy metal elements in the soil of the study area have been obtained by iterative method. The As is 4.75 mg 路kg ~ (-1) Cr = 18.55 mg/kg,Pb, 11.30 mg/kg,Cu, 4.01 mg/kg,Zn, 16.42 mg/kg,Ni, 4.08 mg/kg.2,. By analyzing the geochemical reference values of each statistical geological unit, the lacustrine area with higher geochemical reference value of each element, the Lower Cretaceous Damoguahe formation. The lower Cretaceous Cretaceous and the first member of the Baoligaomiao formation of the Carboniferous, with low geochemical reference values in the Carboniferous intrusive rock area; The reference value of the alluvial area is close to that of the whole area. The area weighting method is used to determine the geochemical reference value of the whole area and the iterative method to determine the geochemical reference value of the whole area. The six elements in the lake bottom sediment are determined. Geochemistry datum, Compared with the geochemical reference value of the whole area, the content of As,Pb is close to that of the corresponding element in the whole area. The content of As,Pb is higher than that of the corresponding element in the whole area. Some elements in the lake bottom sediments collected in this study area, such as As,Pb, can represent the reference values of the corresponding elements in the samples of the whole region, and some elements such as Cr,Cu,Zn,Ni, can not represent the reference values of the corresponding elements in the samples of the whole region.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P632.1

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