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化探工作中区域背景和异常下限的确定是个至关重要的问题。自本世纪四十年代后期化探方法迅速发展以来,区域背景和异常下限的确定大致经历了二个阶段。早期是在认定化探数据服从正态分布或对数正态分布的基础上,使用数理统计的简单计算方法所得出的一个常数用来划分正常和异常。六十年代开始利用各种数学模型分别拟合,逼近区域背景和异常。趋势分析就是这些数学方法中的一种,而且是较早被使用的一种。无疑的,趋势分析相对以前的方法是前进了,它起到了承前启后的作用,尽管趋势分析还存在一些问题,但是简单地否认它既是不慎重的,也是不公正的。
The determination of the regional background and abnormal lower bound of geochemical exploration work is a crucial issue. Since the rapid development of the geophysical methods in the late 1940s, the determination of the regional background and the lower limit of anomalies has generally gone through two stages. In the early stage, based on the assumption that geochemical data obey normal distribution or log normal distribution, a constant obtained by simple calculation method of mathematical statistics is used to distinguish normal from abnormal. Sixty years began to use various mathematical models were fitted to approximate the regional background and anomalies. Trend analysis is one of these mathematical methods, and is one of the earlier to be used. Undoubtedly, the relative method of trend analysis is to move forward. It plays a bearing on the past and although there are still some problems in trend analysis, it is neither prudent nor unjust to simply deny it.