Metamorphic+Rocks

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All rocks are interrelated to each other, through the rock cycle, where the change into each other through weathering and erosion, melting and so on. Metamorphic rocks occur when rocks are transformed through heat, pressure and chemical fluids that are different from the ones that formed the original rock. Metamorphic comes from Greek and means “change form.”. Metamorphic Rocks can be classified through many different ways, and formed through many different processes. Check the links below for more specific information. =====

Classifying Metamorphic Rocks
Rock Cycle

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 * Metamorphic Rock Formation **==

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Metamorphic rocks may turn into different types of rocks or even the same type of rock, just a different kind. Metamorphic rocks form at around 12-16 kilometers deep in the ground. Even after changing into a new form, the chemical composition could be the same. One rock can actually turn into several different rocks, from one to another to another and so on. For example, shale turns to slate, then to phyllite, then to a mica-rich schist. Rocks can change in many ways, rocks can be put under immense pressure, there could be chemical changes and of course, the magma, all of which could change the different rocks. =====



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When magma moves through the rocks, it bakes them which changes them. This is **contact metamorphism**. As the temperature, depth and pressure increases, the rocks change into rocks of higher grade. but if only one increases, it becomes a different type. Hornfels is a common **contact metamorphic rock**, which is morphed only because of increasing heat but if there's only increasing pressure, shale will become blueschist. Increase of heat and pressure with depth causes **regional metamorphism** where magma rises under a large geographic area. Rocks can also form along fault lines, and then, it’s called **dynamic metamorphism**. Metamorphic rocks change in terms of textures and mineralogy. Also, with compaction, the mineral grains are pressed together more, and the rock becomes more dense, and less porous.=====

** Table of Shale Metamorphism(Step by Step) **

 * [[image:Shale.jpg caption="Shale"]] || [[image:slate.jpg width="180" height="118" caption="Slate"]] || [[image:phyllite.jpg width="150" height="109" caption="Phyllite"]] ||

Shale changes into these minerals of higher grade, higher with increasing heat and pressure. Shale, being the lowest grade and migmatite being the highest.

 * [[image:schist.jpg width="150" height="114" align="center" caption="Schist"]] || [[image:gneiss.jpg width="180" height="111" align="center" caption="Gneiss(pronounced Nice)"]] || [[image:migmatite.jpg width="174" height="112" align="left" caption="Migmatite"]] ||