利用定量矿物再造法恢复阜平群的原岩性质 介绍一种原岩恢复的新方法

恢复变质岩石的原岩性质,是在变质岩地区从事地质填图、矿产普查和勘探工作时所面临的重要而又困难的工作。目前人们利用野外地质产状、变余结构构造、岩石化学、地球化学、同位素地质学,副矿物等多种方法和手段来探讨这一问题,其中的一些方法已被广泛利用,有些方法在国内已有介绍。本文以阜平群为例介绍苏联学都鲁金科(B.

Restoration of the Metamorphic Rocks of the Fuping Group Using the Method of Quantitative Mineralogy

In this paper the authoxs took the Fuping Group for example to introduce the method of B. E. Lujinco (B. E. PyAeHxo) which used quantitative mineral- ogy calculation for inferring the chemical composition of rocks and restoring the protolith nature of metamorphic rocks. Conversion coefficients of some minerals were added with hundreds of mineral analyses. Comparing this method with the other protolith restoration methods, the authors concluded: 1 .This method is applicable for protolith restoration. Its advantages are of being economic, quick and simple in performance. 2.This method is conducive in solving some problems of protolith restora- tion which are difficult to be solved with the orther petrochemical methods. For example, in the case of some thin-bedded rocks this method may be used for calculating the mineral contents of each layer separately, restoring the protoliths nature of each layer and discussing their forming environment. 3 .The practice work indicated that this method is not quite successful for restoration of the protolith nature of amphibolitic rocks, but it is satisfac- tory for restoration of other type rocks.