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对法国海西期四个产铀岩体 (二云母花岗岩) 中白云母的发育演化进行了研究,认为在岩浆期后和热液活动的各个不同阶段形成不同世代的白云母。用电子探针对不同世代形成的白云母进行了晶体化学研究后表明,随着时间的推移,多硅白云母 (Phergite) 的特征有所增加,而钠云母(Paragonite)含量有所减少。不同岩体中同一世代的白云母在成分上有极大的相似性。研究表明,最早的岩浆期后形成的白云母在后来热液作用下,有不同的演化趋势。当发生云母型变正长岩化时,白云母趋向于重新平衡;而在形成沥青铀矿以及一般裂隙脉体的情况下,白云母却维持原来的特征。
The development and evolution of muscovites from four uraninite bodies (micascades) during the Hercynian period in France are studied. It is believed that muscovite muscovites are formed at different stages after the magma and hydrothermal activities. Electron microprobe studies of muscovite from different generations have shown that the characteristics of Phegite increase and the content of Paragonite decreases with the passage of time. Muscovites of the same generation in different rock mass have great similarities in composition. The study shows that the muscovite formed after the earliest magmatic period has different evolutionary trends under later hydrothermal processes. Muscovite tended to rebalance when metamorphosed metamorphic rocks, whereas muscovite maintained its original character in the formation of asphaltic uraninite and general fractures.