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近来几个工作者指出,地质体中金的自然产出是不均匀的,找贵重金属的问题在于取样。为了获得岩石中金的真正代表值,需要采集一个大样品(约9 kg),并使用特殊的样品配制方法。文中介绍一种利用K/TI比值的可选择方法,该法简单、并能为勘查目的提供更有意义的资料。为了确定金含量与样品大小的变化关系,对火山岩、碱性岩和沉积岩的背景和矿化样品进行了Au,K和TI的分析。在每一种岩石中,将一个4.5—9.0 kg重的样品分成10个0.45—0.90 kg的副样,进行捣碎、研末,然后分析Au,K和TI。背景样品中Au,K和TI含量的变化可以忽略。而从火山岩、碱性岩和沉积岩10个矿化样品的薄片中显示出的Au含量变化较大,但每套薄片中的K/TI比值几乎保持不变,因此,提出K/TI比值对样品大小的变化是不敏感的。从美国西部几个Au矿床上获得的地球化学资料也表明,在仅有Au丰度的基础上,不能成功地将与Au
Several recent workers have pointed out that the natural output of gold in geologic bodies is uneven, and the problem with finding precious metals lies in sampling. In order to get a true representation of the gold in the rock, a large sample (about 9 kg) needs to be collected and a special sample preparation method is used. This article presents an alternative method of using K / TI ratios that is simple and provides more meaningful information for exploration purposes. In order to determine the relationship between gold content and sample size, Au, K and TI were analyzed for background and mineralized samples of volcanic rock, alkaline rock and sedimentary rock. In each rock, a 4.5-9.0 kg weight sample was divided into 10 0.45-0.90 kg aliquots, mashed, ground, and analyzed for Au, K, and TI. The background sample Au, K and TI content changes can be ignored. However, the contents of Au in the 10 mineralized samples from volcanic rocks, alkaline rocks and sedimentary rocks show great changes, but the K / TI ratio in each set of thin plates remains almost unchanged. Therefore, The size of the change is not sensitive. The geochemical data obtained from several Au deposits in the western United States also indicate that on the basis of Au abundances only, Au