What is the Protolith of Anthracite?

What is the protolith for anthracite?

Marble – fine to medium interlocking calcite crystals, Parent Rock = limestone. Anthracite Coal – Low grade (if T is too high, the coal turns to graphite), Parent Rock = bituminous coal.

How do you find protolith?

In low grade metamorphic rocks, original textures are often preserved allowing one to determine the likely protolith. As the grade of metamorphism increases, original textures are replaced with metamorphic textures and other clues, such as bulk chemical composition of the rock, are used to determine the protolith.

What is the protolith of slate?

For example, the protolith of a slate is a shale or mudstone. Metamorphic rocks can be derived from any other kind of non-metamorphic rock and thus there is a wide variety of protoliths. … The non-metamorphic rocks fall into two classes: sedimentary rocks, formed from sediment, and igneous rocks, formed from magma.

What is the protolith of Orthogneiss?

Definition: A gneiss with mineralogy and texture indicating derivation from a phaneritic igneous rock protolith. Typically consists of abundant feldspar, with quartz, and variable hornblende, biotite, and muscovite, with a relatively homogeneous character.

Why is a protolith important?

The type of rock that a metamorphic rock used to be, prior to metamorphism, is called the protolith. … This fluid phase may play a major role in the chemical reactions that are an important part of how metamorphism occurs. The fluid usually consists largely of water.

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Where does black slate come from?

Slate is derived from shale-type sedimentary rock of clay or volcanic ash that underwent low-grade regional metamorphism. It is mainly composed of quartz and muscovite or illite. Some minerals like biotite, chlorite, hematite, and pyrite are also usually present in slate.

Can any rock be a protolith?

The original rock that has undergone metamorphism is called the protolith. Protolith can be any type of rock and sometimes the changes in texture and mineralogy are so dramatic that is difficult to distinguish what the protolith was. Note that diagenesis and weathering are also a changes in form that occur in rocks.