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Fracture (geology)

This article is about fractures in rocks. For the terminology describing the shape and texture of breakage surfaces in single minerals, see Fracture (mineralogy).
A fractured rock in the Eastern Cape in South Africa, a mechanism of brittle deformation in response to stress

A fracture is any separation in a geologic formation, such as a joint or a fault that divides the rock into two or more pieces. A fracture will sometimes form a deep fissure or crevice in the rock. Fractures are commonly caused by stress exceeding the rock strength, causing the rock to lose cohesion along its weakest plane.[1] Fractures can provide permeability for fluid movement, such as water or hydrocarbons. Highly fractured rocks can make good aquifers or hydrocarbon reservoirs, since they may possess both significant permeability and fracture porosity.

  1. ^ Park, R. G. (2005) Foundation of Structural Geology (reprint of the 1997 Chapman and Hall edition) Routledge, Abingdon, England, p. 9, ISBN 978-0-7487-5802-9

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