在某些变质岩地带,没有可利用的并具有充分鉴定意义的矿物组合,因此,要确定整个岩系的精确P-T座标是很困难的。在这样的情况下,正如各个作者的工作结果所表明的那样,详细的矿物学研究可能有很大的助益。文中特别强调了某些普通矿物(或矿物对)的化学成份与变质程度之间的直接关系。在变质岩最普通的矿物中,云母的广泛 In some metamorphic rocks, there are no available and well-characterized mineral assemblages, so it is difficult to determine the exact P-T coordinates of the entire rock series. In such circumstances, detailed mineralogical studies can be very helpful, as the results of the authors’ work suggest. In particular, the text emphasizes the direct relationship between the chemical composition and the degree of deterioration of some common minerals (or mineral pairs). Among the most common minerals in metamorphic rocks, micas are widespread