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本文以我国华南几个花岗岩体为实例,讨论花岗岩中黑云母化-黑云母重结晶作用的地质意义。 作者通过对我国华南一些花岗岩体的研究,认识到在印支期和印支期以前的花岗岩类中,由黑云母化-黑云母重结晶作用形成的次生黑云母分布较广。次生黑云母在这些花岗岩类岩体中的发育情况,与花岗岩类受到的变质程度一致。在地洼系中,花岗岩类变质程度低,次生黑云母不发育;地穹系中,花岗岩类变质程度普遍较强,次生黑云母十分普遍,尤其在地穹系核部的花岗岩类中次生黑云母成为主要的暗色矿物。 次生黑云母的形成,是在地洼阶段激烈期所产生的热动变质作用的结果,是地洼阶段变质作用的一种表现形式。
In this paper, we take several granite bodies in southern China as an example to discuss the geological significance of biotitization-biotite recrystallization in granite. Based on the study of some granite bodies in South China, the author has realized that the secondary biotite formed by the recrystallization of biotitization-biotite is widely distributed in the Indosinian and Indosinian granites. The development of secondary biotite in these granitoids is consistent with that of granites. In the Diwa system, the granites have a low degree of metamorphism and the secondary biotite is undeveloped. The metamorphic degree of the granite is generally high in the dome, and the secondary biotite is very common, especially in the granite classes of the dome Secondary biotite becomes the main dark mineral. The formation of secondary biotite is the result of thermal metamorphism produced during the intense period of Diwa stage and is a manifestation of the metamorphism of Diwa stage.