墨江金厂金矿床金元素空间富集规律研究

STUDY ON THE SPATIAL ENRICHMENT REGULARITIES OF GOLD IN JINCHANG GOLD DEPOSIT IN MOJIANG COUNTY, YUNNAN

运用数理统计和地质统计学方法,从矿区地层岩性、构造、岩浆岩、矿体的空间分布等方面研究了墨江金厂金矿床金元素的空间富集规律。结果表明,金元素空间分布总体上遵循左偏对数正态分布,为两个正态分布的混合,金品位平均值分布区构成了矿化区的主体;金矿体较集中分布于三叠系底板起伏较大的地段,富集方向主要呈北西、北西西向,矿体厚度、品位变化大;北西向断层组较北北西向断层组易于金元素的矿化富集,形成大矿体;矿体金品位一般有远离岩体升高、靠近岩体降低的趋势。

Up to now, a great amount of data about gold and other elements were obtained through prospecting and production in Jinchang gold deposit. If the data can be used sufficiently, it will be useful for exploration activities in terms of reduction of exploration fare, as well as for mine production and construction. In this paper, the spatial enrichment regularities of gold are studied from the spatial distribution of ore bodies, lithology, construction and magmatic rocks with the methods of statistics and geostatistics. And the results are listed as follows: 1) The distribution of gold obeys the normal distribution in the form of logarithm, and the distribution is composed of two normal distributions. Most gold ore grades are on the average while the grade generally changes with the scale. 2) The gold ore-bodies mainly occur in the bottom stratum of the Triassic formation, their thicknesses and grades change dramatically, and the gold is mainly enriched along the NW direction. 3) In comparison to the north-northwest direction, gold tends to large ore-bodies in the direction of northwest. 4) Gold grade in ore-bodies tends to be lower near the magmatic rocks, and becomes higher when they are further from the magmatic rocks.