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在新南威尔士东北部托林顿地区的花岗岩和森林覆盖地带进行了简要的试验,研究评价铀的水系地球化学取样的效果。在水系沉积物以及流经含微量铀的钨矿点的水中,均有铀量异常。诸如自然汇水区和水系沉积物中的有机物含量等相互联系的一些因素影响铀的分布,而水系沉积物中有机物含量对铀量的影响最为明显。沉积物中有机物含量的变化与河道中植物有机碎片和木炭的聚集有关,这是由于为稀疏森林所覆盖的地表受层状冲刷作用所致,特别是在地势高的汇水区内。有机物从季节性流动的河水中吸附铀,在这种环境下,当设计和解释测量结果时,必须仔细考虑水系沉积物中铀含量的季节性变化。
A brief trial was conducted on granite and forest cover in the Torrington region of northeast New South Wales to study and evaluate the effectiveness of uranium geochemical sampling. Uranium anomalies are present in both water sediments and water flowing through tungsten deposits containing trace amounts of uranium. Some factors such as the organic matter content in natural catchments and sediments affect the distribution of uranium and the effect of organic matter in sediments on uranium is most pronounced. Changes in organic matter content in the sediments are related to the accumulation of organic debris and charcoal in the channels, due to the stratiform scouring of the surface covered by sparse forests, especially in high-lying catchment areas. Organics adsorb uranium from seasonal flowing rivers where the seasonal variations in uranium content in sediments of water systems must be carefully considered when designing and interpreting measurements.