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第六講 变質作用和变質岩为什么会有变質岩在前面几講里我們談到了地質作用,这是一种極其偉大的自然力量;有了它才能够形成地球外壳的各种岩石。如大家都知道的,火成岩是由內力造成的,而沉積岩則是由外力產生的。除此以外,地質作用还常常使已經生成的岩石發生变形、变位和变質。在这一講里我們將談一談岩石的变質和它的变質物——变質岩。岩石能够变質,乍看起來似乎有些离奇。那么坚硬的石头还会变質嗎?產生这个疑問是很自然的,因为我們日常生活中誰也没有看到岩石的变質过程。我們看到的石头今天是这样,明天还是这样,日子久了,
Lecture 6: Metamorphism and Metamorphic Rocks Why Metamorphic Rocks In the preceding few talks, we talked about the geological role that is an extremely great natural force; with which it is possible to form a variety of rocks in the earth’s crust. As we all know, igneous rocks are caused by internal forces, while sedimentary rocks are generated by external forces. In addition to this, geological processes also often deform, dislodge, and degrade rock that has already formed. In this talk we will talk about rock metamorphism and its metamorphic - metamorphic rocks. At first glance the rocks seem to be bizarre at first glance. So hard stones will be metamorphic it? This question is very natural, because no one in our daily life to see the metamorphic process of the rock. The stones we saw today are like this, tomorrow or so, as time goes by,