摘要
以行洛坑细-网脉状钨矿为实例,对服从对数正态分布的区域化变量,分别用原始品位值和对数变换值建立变异函数模型。通过交叉验证等方法研究表明,对原始数据进行对数变换所得到的模型能更好地揭示区域化变量的空间变化规律,而且,对数线性克立格估值也比线性克立格估值更佳。
In Xinglaokeng granite stringer-network vein type tungstic deposit, WO_3grades of original core samples of the whole deposit follow lognormal distribution,and the distribution of the 10m-core regularized sample grades is in a three-para-meter lognormal form. Two kinds of experimental variograms are respectivelycalculated by using WO_3 grades and their log-transformed values. The results arefit to theoretical models. The cross validations show that log-transformed modelreveals the spatial variability of the regionalized variable far better than WO_3 gradesmodel, and that log-linear kriging estimators is better than the linear krigingestimators.
关键词
钨矿
变异函数
数学模型
log normal distribution
mathematical models
geomathematics
tungsten deposit/variogram
kriging
lognormal kriging
cross validations
