The accepted alliance of ore with intrusive igneous rock may be discussed in terms of granite, for granite is regarded as the predominant rock of this kind. However, much granite has been observed in recent years which seems to be, not "magmatic" -- that is, not intrusive and igneous--but "metamorphic." This second kind of granite is thought to be at the end of a metamorphic series that started in great part with marine sediments; it is, essentially, recrystallized mud.How is the theory of ore genesis affected by what we know of this metamorphic granite?

First Page Preview

First page PDF preview
You do not currently have access to this article.