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一个可以说花岗岩变质岩,或不吗?

在我的旧课本,花岗岩的一部分变质岩石。
这仍然是真的吗?如果没有完全真的,到什么程度?
可以有人点我走向清晰的例子或定义显示他们是吗不变质岩石了吗?

如果不变质,请它们属于哪个部分岩石分类?

谢谢,吉尔伯特。

回答

这是关键:>过去看这是很重要的一部分在一个历史背景。直到1950年代末和1960年代初,没有花岗岩形成的协议。这成为了(* * * *花岗岩争议)[1]。一方面,实验工作表明,花岗岩的岩浆结晶,但这必须来自basalt-like岩浆岩浆。这导致了两个问题:1。所有的玄武岩,花岗岩在哪里应该形式?2。发生了什么之前所有的岩石形成的花岗岩(又名“房间问题”)?这使得人们认为花岗岩形成的(交代)[2]替换其他的岩石。从本质上讲,你有其他事情,没有花岗岩通过各种地质过程转化为花岗岩,没有从岩浆结晶。 This is what people say when they talk about granites as metamorphic rocks. However, this is not the case and later research demonstrated that granites form by crystallisation of magma and the process of metamorphic formation of granites (by metasomatism, or "granitisation") does not actually exists. There were (and still are) many questions left unanswered on exactly how this happens, but we know granites are indeed igneous rocks. In fact, there's a [great paper][3] published in Nature, showing modelling of how some of these things can form. ---------- Nevertheless, granite formed can be sometimes related to metamorphism. Extreme cases of hot metamorphic can cause melting of (previously sedimentary and then metamorphic) rocks to form magma that eventually crystallises as granites. This is known as [migmatisation][4], and is commonly used to explain the widespread occurrence of "leucogranites" in the Himalayas for example. Additionally, some high-grade metamorphic rocks contain quartz, feldspars, micas, and amphiboles. The metamorphic texture (foliation and lineation) is not always obvious, making it easy to mistake metamorphic gneisses as igneous granites. [1]: https://duckduckgo.com/?q=granite%20controversy&t=ffab&ia=web [2]: https://en.wikipedia.org/wiki/Metasomatism [3]: https://doi.org/10.1038/s41586-018-0746-2 [4]: https://en.wikipedia.org/wiki/Migmatite

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