Fractures can be as small as a cracked boulder or as large as a continent. Depending on the size, how the fracture occurs and the brittleness of the geologic formation, fractures can be organized into several categories. Joint fractures can be systematic, or straight and regular, or nonsystematic, which are irregular. Sheet or exfoliation joints are curved fractures that occur in extrusive volcanic rock.
Prof. Dr. Agust GUDMUNDSSON – Structural Geology and Global Tectonics
Extrusive rocks form from magma cooled slowly deep within the Earth. Columnar joints are fractures that isolate polygon-shaped columns of rock. Joints can be very small or they can be tectonic, running across a large region. A tensile fracture occurs when the edges pull apart as pressure is applied.
Dr Stephen Laubach – Cracking the Puzzle of Rock Fracture with Crystal Clues
The break in the rock runs perpendicular to the pressure that is applied. Cambridge University Press, Ships with Tracking Number! May not contain Access Codes or Supplements. May be ex-library. Buy with confidence, excellent customer service!
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