论文部分内容阅读
异常下限的确定是化探工作中核心环节之一。本文应用泛克里格趋势分析法的原理和方法流程,以甘肃夏河—合作地区1∶20万化探数据中Au、Cu、Ag、As、Sb、Hg元素为例,分别利用泛克里格趋势分析法和传统统计法求取它们的异常下限值,并结合地质矿产背景对比分析了两种方法在研究区内的应用效果。趋势分析法其圈定的异常能够反映元素含量在空间上的变化,受背景的干扰较小,指示矿化的能力较强;与传统统计法相比较,趋势分析法圈定的异常不仅与已知矿床(点)的空间分布吻合更好,而且异常强度大,分带性好,浓集中心高;还反映了区域断裂沿NW—SE向展布。泛克里格趋势法还圈定出一些传统统计法未能识别出的异常,为开展下一阶段的地质矿产勘查工作提供了重要参考。
Determination of the lower limit of anomaly is one of the core aspects of geochemical exploration. In this paper, we use the principle and method of the ungraded trend analysis method to take Au, Cu, Ag, As, Sb, Hg elements in 1: 200,000 geochemical exploration data of Xiahe-Hezuo area of Gansu as an example. Trend analysis and traditional statistical methods to get their lower limit of anomaly, and combined with the geological and mineral background comparative analysis of the two methods in the study area effect. The delineated anomaly of trend analysis method can reflect the spatial variation of elemental content, less disturbed by the background and strong ability of indicating mineralization. Compared with the traditional statistical method, the anomaly delineated by the trend analysis method is not only inconsistent with the known deposit Point) is more consistent with the spatial distribution, and the anomaly intensity, zoning is good, the concentration center is high; also reflects the region along the NW-SE fracture distribution. The Pan-Kruger Trend Law also defines some anomalies that can not be identified by traditional statistical methods and provides an important reference for the next phase of geology and mineral exploration.