判断铝土矿成矿物质来源的数学方法

THE APPLICATION OF A MATHEMATIC METHOD TO DETERMINING MATERIAL SOURCES OF BAUXITE DEPOSIT

自加里东运动以来,华北陆块南部处于长期的隆起状态,寒武—奥陶系及其以前的不同类型基底剥蚀达1.4Ma之久,这为铝土矿的形成创造了有利的环境和物质来源。铝土矿成矿物质来源有2种:碳酸盐岩基底和硅酸岩基底。化学习性活泼的元素在风化、迁移、沉积过程中会产生变化,而稳定的化学元素则在风化前和沉积成矿后具有一定的联系,尤其是氧化物对比值。通过对不同地质单元的常用氧化物对比值进行讨论与数学模拟,揭示了铝土矿的成矿物质来源。为判断铝土矿成矿物质来源提供一种简便、快捷的数学统计方法。

Since Caledonian movement,the earth＇s crust in Henan area has been uplifted for so long time that the denudation of Cambrian-Ordovician strata has lasted for 140 Ma,which has provided preferable environmental conditions for the formation of bauxite.The material sources of bauxite were derived from both carbonate rock basement and silicate basement.Some changes of active elements might have taken place during the weathering,immigration and sedimentation,whereas for the stable elements certain connections did exist before weathering and after sedimentation and mineralization,especially for the ratios of the stable element couples.On the basis of a study and stimulation of the oxidation couple ratios between carbonate rock basement,silicate basement,aluminum-bearing rock series and bauxite deposits,the material sources of bauxite can be judged.This is a quick and convenient mathematic statistic method for judging the material sources of the bauxite.