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在意大利阿尔卑斯山区的变质基底中所进行的铀的地球化学勘测,曾在马特罗流域的冲积层和水中发现有显著的异常。详细测量表明在地球化学异常附近没有发现铀矿点或矿床的露头。为了确定这些异常的来源,因此进行了详细的研究。对淡水,岩石,河流沉积物及土壤样品进行了铀的分析。这些水样也作了所有重要元素以及某些痕量元素分析。岩石样品的浸出试验提供的资料,使我们更好地了解关于铀以及重要元素的溶解作用。本研究的结果重点是强调铀在表生环境中的某些特征。1.特别是伟晶岩中呈晶质铀矿的铀是最容易地进入天然水的元素,在那里它可以达到异常值,甚至正常含量的岩石中的铀也可以形成水异常。2.溶解在淡水中的一部分铀,被土壤和河流沉积物的有机质所沉淀。铀沉淀的比率不高,但足能引起冲积物中铀含量达到重要异常值。在勘探地区的特殊环境中,这些作用说明在水和冲积物中所发现的异常是由平均铀含量稍高于克拉克值(近于5ppm)的岩石所引起的。
Geochemical surveying of uranium in metamorphic basalts in the Italian Alps has found significant anomalies in alluvial deposits and water in the Matteo Valley. Detailed measurements show that no outcrops of uranium deposits or deposits have been found in the vicinity of geochemical anomalies. In order to determine the source of these anomalies, therefore, a detailed study was conducted. Uranium was analyzed for freshwater, rocks, river sediments and soil samples. These water samples also make all the important elements as well as some trace elemental analyzes. The information provided by the leaching tests on rock samples allowed us to better understand the dissolution of uranium and important elements. The results of this study focus on highlighting certain characteristics of uranium in superficial environments. 1. In particular, uraninite, which is a crystalline uraninite in pegmatite, is the easiest element to enter natural water, where it can reach outliers and uranium in rocks of even normal content can form water anomalies. 2. A portion of uranium dissolved in freshwater is precipitated by the organic matter in soil and river sediments. The rate of uranium precipitation is not high, but enough to cause uranium in the alluvial sediments to reach important anomalies. In the special environment of the exploration area, these effects suggest that the anomalies found in water and alluvial deposits are caused by rocks with slightly higher average uranium content than the Clarke value (close to 5 ppm).