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Ductile deformation identification and geology

Permanent deformation of rock that occurs without fracturing, through mechanisms such as crystal-plastic flow, dislocation creep, diffusion creep, and grain-boundary sliding. Ductile deformation is favored by high temperature, high confining pressure, slow strain rates, and the presence of fluids—conditions typically found at depth in the Earth's crust generally 10–15 km . It produces structures such as folds, foliation, and mylonites. Field: structural geology. Example: Quartzite in the Moine Thrust Zone of Scotland has been intensely deformed by ductile shearing, producing mylonites with stretched quartz grains and aligned mica that record the deformation conditions at depth during the Caledonian orogeny.. Related terms: Brittle deformation, Mylonite, Shear zone, Creep.

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Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner
GeoMiner
Last updated
2026-03-30T15:19:41.999576+00:00
Review status
Published; not independently peer-reviewed
  • USGS Thesaurus — U.S. Geological Survey. Controlled earth-science terminology used to describe USGS information resources.
  • Glossary of Geologic Terms — U.S. National Park Service. Geologic definitions prepared by the NPS Geologic Resources Inventory.

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Common questions

What does Ductile deformation mean in geology?
Permanent deformation of rock that occurs without fracturing, through mechanisms such as crystal-plastic flow, dislocation creep, diffusion creep, and grain-boundary sliding. Ductile deformation is favored by high temperature, high confining pressure, slow strain rates, and the presence of fluids—conditions typically found at depth in the Earth's crust generally 10–15 km . It produces structures such as folds, foliation, and mylonites.
What is an example of Ductile deformation?
Quartzite in the Moine Thrust Zone of Scotland has been intensely deformed by ductile shearing, producing mylonites with stretched quartz grains and aligned mica that record the deformation conditions at depth during the Caledonian orogeny.
Which earth-science field uses the term Ductile deformation?
Ductile deformation is used in structural geology.
Which terms are related to Ductile deformation?
Related terms in this reference are Brittle deformation, Mylonite, Shear zone, Creep.

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