Schematic illustration of regional denudation for felsic alkaline intrusive rock bodies of the State of Rio de Janeiro, Brazil: Cabo Frio Island and Itaúna Body.

In geology, denudation is the long-term sum of processes that cause the wearing away of the earth’s surface leading to a reduction in elevation and relief of landforms and landscapes. Endogenetic processes such as volcanoes, earthquakes, and plate tectonics uplift and expose continental crust to the exogenetic denudation processes of weathering, erosion, and mass wasting.



Denudation incorporates mechanical, biological and chemical processes of erosion, weathering and mass wasting. Denudation can involve the removal of both solid particles and dissolved material. These include sub-processes of cryofracture, insolation weathering, slaking, salt weathering, bioturbation and anthropogenic impacts.[1]

Factors affecting denudation include:

  • Surface topography
  • Geology
  • Climate (most directly in chemical weathering)
  • Tectonic activity
  • Biosphere (fauna and flora)
  • Anthropogenic activity


Modern denudation estimates are usually based on stream load measurements taken at gauging stations. Suspended load, bed load, and dissolved load are included in measurements. The weight of the load is converted to volumetric units and the load volume is divided by the area of the watershed above the gaging station. The result is an estimate of the wearing down of the Earth's surface in inches or centimeters per 1000 years.[2] In most cases no adjustments are made for human impact, which causes the measurements to be inflated.[3]

Denudation rates are usually much lower than the rates of uplift. The only areas at which there could be equal rates of denudation and uplift are active plate margins with an extended period of continuous deformation.[4]

Proposed cycles

Early studies prompted the formation of denudation cycle hypotheses to describe land formations. Although at present they are mostly discounted, many of these models are enduring due to their simplicity and seemingly obvious assumptions.

In the 1890s W. M. Davis proposed a cycle of 'wearing down' in which so called 'young' landscapes had high gradients and elevations, and waning, low elevation topography through middle age to old age. Landscapes of Britain and Wales were thought to reflect these multiple peneplanation and rejuvenation cycles, such as the 3,000-foot remnant summit plateau in North Wales. A number of assumptions of fluvial and glacial dynamics in temperate areas were made in the formation of this model.

Such theories were proposed before tectonic theory was largely understood, and therefore are now largely discredited.

Volcanic landforms

A) Villarica Volcano, Chile, a volcano without effects of erosion and denudation
B) Chachahén Volcano, Mendoza, Argentina, a volcano with strong effect of erosion but no denudation
C) Cardiel Lake, Santa Cruz, Argentina, a volcanic area under strong effect of denudation, exposing subvolcanic rock body.[5]

Denudation exposes deep sub-volcanic structures on the present surface of the area where volcanic activity once occurred. Sub-volcanic structures such as neck and dyke (volcanic vent) are exposed by denudation.

Medical use

In medicine, denudation refers to the loss of surface layers, such as the epithelium.


  1. ^ Smithson, P et al (2008) Fundamentals of the Physical Environment (4th ed.)
  2. ^ Ritter, D.F. 1967. Rates of denudation. Jour. Geol. Educ. 15, C.E.G.S. short rev. 6:154-59
  3. ^ Judson, S. 1968. Erosion of the land. Am. Scientist 56:356-74
  4. ^ Burbank, D.W., and Beck, R.A. 1991. Rapid long term rates of denudation. Geology 19:1169-72
  5. ^ Motoki, Akihisa; Sichel, Susanna (in Brazilian Portuguese). Avaliação de aspectos texturais e estruturais de corpos vulcânicos e subvulcânicos e sua relação com oambiente de cristalização, com base em exemplos do Brasil, Argentina e Chile. 

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Look at other dictionaries:

  • dénudation — [ denydasjɔ̃ ] n. f. • 1374; bas lat. denudatio ♦ Action de dénuder. ♢ Méd. Action de mettre à nu un organe, un tissu, une dent, par incision ou par opération; état qui en résulte. ♢ Cour. État d un arbre dépouillé de son écorce, de son feuillage …   Encyclopédie Universelle

  • dénudation — DÉNUDATION. sub. f. Terme de Chirurgie. État d un os qui paroît à découvert. La dénudation est assez ordinaire dans les fractures …   Dictionnaire de l'Académie Française 1798

  • denudation — early 15c., from M.Fr. dénudation, from L. denudationem (nom. denudatio), noun of action from pp. stem of denudare (see DENUDE (Cf. denude)). Figurative use is from 1590s. In geology, from 1811 …   Etymology dictionary

  • Denudation — Den u*da tion (?; 277), n. [L. denudatio: cf. F. d[ e]nudation.] 1. The act of stripping off covering, or removing the surface; a making bare. [1913 Webster] 2. (Geol.) The laying bare of rocks by the washing away of the overlying earth, etc.; or …   The Collaborative International Dictionary of English

  • Denudation — (lat., Entblößung), die Freilegung ehemals überdeckter Gesteinsmassen, oder allgemein die auf ausgedehnten Flächen erfolgte Abtragung von Gesteinsmaterial. An der D. beteiligen sich die verschiedenartigsten gesteinzerstörenden und wegführenden… …   Meyers Großes Konversations-Lexikon

  • Denudation — Denudation, s. Erosion …   Lexikon der gesamten Technik

  • Denudation — (lat.), Entblößung, bes. in der Geologie gebraucht; denudieren, entblößen …   Kleines Konversations-Lexikon

  • Denudation — Denudation, lat., Entblößung, Entkleidung; denudiren, entblößen, entkleiden …   Herders Conversations-Lexikon

  • Denudation — Denudation,die:⇨Einebnung …   Das Wörterbuch der Synonyme

  • Denudation — Als Denudation (von lateinisch denudare = entblößen) wird eine flächenhaft wirkende Abtragung der Festlandsoberfläche bezeichnet. Die Denudationsprozesse tragen den Regolith bis zur Entblößung des darunter liegenden Gesteins ab, sofern diese… …   Deutsch Wikipedia