What are the characteristics of metamorphic rocks?
What are the characteristics of metamorphic rocks?
Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a “squashed” (foliated or banded) texture.
What is a Chemographic diagram?
Important relationships among rocks and minerals can be discovered or demonstrated by the construction of composition diagrams (also called chemographic diagrams) to display the data. …
What is the structure of metamorphic rocks?
Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. Such features include folds, nappes, and faults with a wide variety of geometries.
What are the formation of metamorphic rocks?
Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
What is the most obvious characteristic of a metamorphic rock?
The most obvious features of metamorphic rocks are certain planar features that are often termed s-surfaces. The simplest planar features may be primary bedding (akin to the layering in sedimentary rocks).
What characteristics of metamorphic rocks might be useful for identifying and classifying metamorphic rocks?
What are the 3 characteristics of metamorphic rocks?
- Classified by texture and composition.
- Rarely has fossils.
- May react with acid.
- May have alternate bands of light and dark minerals.
- May be composed of only one mineral, ex.
- May have layers of visible crystals.
- Usually made of mineral crystals of different sizes.
What is a Harker diagram?
Harker diagram (variation diagram) A diagram that shows the amount of each of the chemical constituents of a rock as a proportion of the main ingredient (usually silica).
What is the difference between metamorphic mineral paragenesis and igneous Petrogenesis?
In an igneous rock various minerals crystallized from a slowly cooling magmatic melt constitute an equilibrium assemblage. Such an assemblage is called a mineral paragenesis. However, in metamorphic rocks derived from sediments the composition may not be the same even over a small volume.
What are the two classifications of metamorphic?
Metamorphic rocks are broadly classified as foliated or non-foliated.
How are metamorphic rocks formed essay?
The rock under pressure and heat doesn’t melt but the chemical or mineral structure of the rock condenses and compacts changing the rock to metamorphic rock. This chemical reaction will cause the rock to change color with the mineral grains and will give the appearance of strips.
Where are the metamorphic rocks formed?
Metamorphic rocks are formed within the Earth’s crust. Changing temperature and pressure conditions may result in changes to the mineral assemblage of the protolith. Metamorphic rocks are eventually exposed at the surface by uplift and erosion of the overlying rock.
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