Geoenvironmental assessment wsing geocemical map

对爱知县北部至岐阜县南部的水系沉积物进行了地质环境评价。对1100份新样品进行了al、Ca、Ce、Co、Cr、Cu、Fe、K、Mn、Mg、Na、Ni、p、Sr、Ti、V、Zn等17种元素的分析。采用ICP-AES和aa进行分析。通过从同一地点进行重复或三次抽样和反复分析，检验所分析数据对抽样地点的代表性。数据显示，Ti丰度的变化幅度为±50%，其他元素的变化幅度为±30%或更少。这种变化可能是由含钛小辅矿物的不均匀分布引起的。在被检查的地区，元素丰度变化了十倍以上。那么这里得到的地球化学图是。重要的是表明元素的面积变化。花岗岩出露区水系沉积物富集inAl、Ca、Na、K和sr，第三系沉积物富集Co、Cr、Fe、Ni、V、Mn和Zn， Ca-Na- sr - al、P-Cu-Zn和Ti-Ce丰度的相关系数均大于0.6。第三系沉积物区样品的系数明显高于花岗岩区样品。尽管其中一个样本显示出较高的cr丰度（785ppm），是第三纪沉积物平均值的20倍，但没有发现人为污染任何元素的明确证据。用INAA和XRF分析了As和Sb等20种元素。结果将于近期公布。

Stream sediments from the northern parts of Aichi Prefecture through the southern parts of Gifu Prefecture were examined for geoenvironmental assessment of the area. New 1100 samples were analyzed for seventeen elements includingAl, Ca, Ce, Co, Cr, Cu, Fe, K, Mn, Mg, Na, Ni, P. Sr, Ti, V and Zn. ICP-AES andAAwere employed for analyzes. The representativeness of the analyzed data for the sampling locality is examined by means of duplicate or triplicate samplings from the same place and by repeated analyzes. The data show ±50% variations in the abundance of Ti and ±30% or less variations for other elements. This variation may have been caused by heterogeneous distribution of small accessory minerals bearing Ti. The elemental abundances vary more than ten times in the examined area. Then the geochemical map obtained here is . Significant to indicate the areal variations of elements. The stream sediments from the area where granitic rockare exposed are rich inAl, Ca, Na, K, and Sr. On the contrary, Co, Cr, Fe, Ni, V, Mn and Zn are enriched in the sediments from the area where the Tertiary sediments are dominant Correlation coefficients higher than 0.6 are found between abundances of Ca-Na-Sr-Al, P-Cu-Zn and Ti-Ce. The coefficients are remarkably higher for the samples from the area of the Tertiary sediments than for the samples from granitic region. Although one sample shows a high Cr-abundance (785ppm), which is 20 times the abundance of the average value for the Tertiary sediments, no clear evidence for artificial pollution of any elements examined here is found. Twenty additional elements including As and Sb are analyzed by INAA and XRF. The results will be published in a shorttime.