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
Long Refractory period - Properties of a Beating Heart Refractory period is the period during which a stimulus fails to evoke a response. In a beating heart, if an external sti

The effect of soil on growing things Get samples of a fertile soil from a flower or vegetable garden, from a wood, from a place where a cellar is life form dug, from a sandy pl

Everything on electrolysis

Describe the factors which decide the broad area of Scientific activity?

Kepler's  Laws of Planetary Motion: Further support to the heliocentric model came from the work of Johannes Kepler at around the same time as Galileo's observations. Kepler, a

Explain the Ketone bodies -  abnormal constituent of urine Ketone body is an intermediate breakdown product of fats in the body. It can be any of three compounds (acetoacetic a

Define the uses of buffer method The buffer method of Shoemaker and coworkers for determining lime requirement is being widely used in India. In this method 5g of soil is added

Question: The Law of the Sea Convention came into force in 1994. Art.56(1)provides the coastal state with sovereign rights for the purpose of exploring and exploiting, conservi

Burns : There are two types of burns which we are to discuss: 1) Chemical 2) Thermal Chemical burns have already been discussed in Sec. 16.7; so we shall discuss thermal

Explain Brain or Detector - Mechanism of Colour Perception The fibre identification of colour takes place in the brain. If any of these four pre-requisites are not present, the