Explain the procedure of rock formation metamorphic rocks, Science

Explain the procedure of Rock Formation Metamorphic Rocks?

Concept 1 :  What is a metamorphic rock? First off, what does metamorphism mean? To morph is to change; a butterfly undergoes metamorphosis when it changes from a caterpillar into a butterfly. Rocks, too, can change as dramatically as the butterfly. Metamorphism in rocks is a change from the original rock type to a new rock type by the forces, or agents of change, within the Earth.

A metamorphic rock is a rock which has been chemically and/or structurally altered by forces within the Earth. Metamorphism occurs underground, as the agents of change are available inside the Earth's crust and mantle. There are three main agents that cause metamorphism to occur in rock:

Heat; heat is a major factor in the recrystallization of rocks within the hot interior of the Earth.

Pressure; pressure from the forces of miles of rock above, as well as stress from plate movement, faults, and forceful magma intrusions into the original rock body.

Chemical activity: chemical activity is the action of water and its dissolved ions on rock to chemically alter the structure and form a new rock. Water is the chief agent in the Earth's crust as a solvent, and the acidity or alkalinity within this water has a major effect on recrystallizing rock mineral structures.

Concept 2 :  There are two main types of metamorphic rocks: foliated, and nonfoliated metamorphic rock. Foliated metamorphic rocks have layers or a layered or striped appearance. Slate is a common example of a foliated metamorphic rock (see image above). Slate has not undergone significant heat or pressure, and is similar to its original structure as a sedimentary deposit. We say slate has undergone low-grade metamorphism, meaning that it has been heated only slightly, and been squeezed somewhat by the pressure from the rock layers above. Phyllite is similar to slate, but has been metamorphized more significantly via intermediate-grade metamorphism. It has been heated up more and shows signs of recrystallization(see image above).

High-grade metamorphism involves the total remolding, compressing, and recrystallization of rock form one type, to a new type, which looks and feels very dissimilar to the original rock. An example of this is a schist, which is pictured at the bottom of this page. A schist is a metamorphized glob of shiny mica crystals which have been heated up considerably within the Earth's crust, then recrystallized into the rock pictured below, which is specifically known as a mica schist.

Posted Date: 5/1/2013 3:23:57 AM | Location : United States







Related Discussions:- Explain the procedure of rock formation metamorphic rocks, Assignment Help, Ask Question on Explain the procedure of rock formation metamorphic rocks, Get Answer, Expert's Help, Explain the procedure of rock formation metamorphic rocks Discussions

Write discussion on Explain the procedure of rock formation metamorphic rocks
Your posts are moderated
Related Questions
Explain Sinus Bradycardia - Electrocardiogram If the SA node discharge rate is slow, the heart rate is slow. ECG is normal in every respect except that the heart rate at rest i

Explain Cell - The Basic Unit of Life You must be aware of the fact that the cell is the basic unit of life. What do you understand by the term 'cell'? What are the components

Explain the Nephrotic Syndrome A type of nephritis (an inflammation of the kidneys) that is characterized by low serum albumin, proteinuria and swelling (oedema). Swelling, wei

Explain the Respiratory Centre The respiratory centre consists of two main parts - inspiratory centre and the expiratory centre. The inspiratory centre is dominant. A reciproca

Age Related Differences in Erythropoiesis 1. During intrauterine life, in the early embryo, erythropoiesis occurs in the mesoderm (the middle of the three germ layers of an emb

Explain Acclimatization - Histotoxic Hypoxia A compensatory respiratory adjustment at moderately high altitudes is called acclimatization.  If you were to visit places like Leh

Explain Isoelectric  pH Isoelectric  pH:   Many  ionizable groups are  present  in  a  protein molecule. Depending on the pH of the medium, some of these groups act as proton

What is permanent wilting percentage As plants absorb water from a soil, they lose most of it through evaporation at the leaf surface.  Some water is also lost by evaporation d

Give the introduction to Lipids metabolism ? Lipids are a heterogeneous group of organic compounds. The major dietary lipids for humans are animal and plant triacylglycerols,

Useful Instruction : In the table given below, you can find references to the locations of materials related to this exercise. You are advised to go through these materials to und