一种新的稀土元素地球化学反演方法及其应用

来源期刊：中南大学学报(自然科学版)1995年第3期

论文作者：赖健清 彭省临

文章页码：290 - 294

关键词：岩浆岩; 稀土元素; 斑岩/地球化学反演

Key words：magmatic rocks; rare earth elements; prophyry/geochemical inversion

摘    要：介绍了单用稀土元素进行岩浆过程判别及源岩(浆)地球化学反演的新方法,根据岩石中稀土元素含量的对数或倒数值的线性相关关系,结合地质及岩石化学特征,可将岩浆过程简单地区分为批式熔融、分离熔融、平衡结晶及分离结晶四类.通过矿物、岩石与熔体间的分配关系可以建立多元方程组,并借助计算机求得近似统计解,从而得出源岩模拟矿物含量及稀土配分曲线.云南省喜山期富碱斑岩的源岩地球化学反演提供了一个应用实例.

Abstract: In this paper,a new method is described for discrimination of magmatic processes andgeochemical inversion by REEs,merely.According to geological and petrochemical proper-ties and the linear correlations between logarithmic or reciprocal value of REE abundances,four magmatic processes which are batch melting, separated melting,equilibrium crystalliza-tion and fractional crystallization may be distinguished simply.On the basis of the distribu-tive relations between minerals and rocks vs. fused mass, equations are built,whose approx-imate statistic solutions are found with the help of electronic computer,thus the simulatedmineral contents and REE abundances of original rock are calculated.Geochemical inversionon Himalayan alkali-rich porphyries in Yunnan province is cited as an instance.