利用化学成分判定花岗岩期次的尝试

华南花岗岩类可以看成一个整体。随着时代的更替,其化学成分呈现有规律的递变。两个地质时代岩石平均成分的差异,是化学演化真实存在的重要证据。本文在此基础上,提取岩石化学分析数据的特征信息。将华南五个期次的花岗岩体作为标准样本,利用模糊滤波器,对湖北随州市北部地区的6个岩体及196个南岭地区的花岗岩体进行评判。其结果表明,利用岩石的化学分析结果,可以建立花岗岩体的年龄“时间表’。

TRIAL DETERMINATION OF AGES OF GRANITES IN TERMS OF THEIR CHEMICAL COMPOSITIONS

In spite of their types, granites in South China can be regared as the whole. As the time goes on, their chemical composition changes regularly. The difference in average composition between the rocks of two different geologic ages provides the important evidence for the actual occurrence of chemical evolution. In this paper, by taking the granites of five epiedes as the standard models, and abstracting useful informaion from among the chemical compositon data for the rocks, an evaluation hasbeen made all the granites in South China with the fuzzy-filter. The results lead us to such a conclusion that the "time-scale" for the ages of granites can be established in terms Of the chemical analyses of granites. This approach is worthy to be recommnded.