Classify and describe different types of joints in rock with neat sketches.
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Commonly, a large number of joints lie parallel to one another. These parallel joints to form a ‘joint- set’. A joint system consists of two or more joint sets.
Classification of Joints:
(A) On the basis of the origin joints may be classified into two groups.
They are:
1. Tension joints:
Tension joints are those, which are formed as a result of tension forces. These joints are relatively open and have rough and irregular surfaces.
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The columnar joints in lava flows and longitudinal joints in the anticline that run parallel to the axis of the fold are the examples of tension joints.
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