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Related to Orogen: orogenesis, Orogenic belt


McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a term introduced in 1921 by the Austrian geologist L. Kober for the second stage of development of geosynclines or tectonically mobile belts of the earth’s crust. This stage is characterized by the predominance of ascending movements and the emergence of mountains. By analogy with the tectonic structure of the Alps, Kober felt that every orogen has a symmetrical structure and is located between rigid masses called kratogens, or cratons, under whose pressure the orogen arises.

Kober divided the orogen into a series of zones. The central part is occupied by rigid granite masses called internides, on both sides of which are the centralides, zones composed of sedimentary and volcanic rocks in the form of enormous overthrust nappes in the direction of the kratogens. The metamorphides, composed of metamorphosed sedimentary rocks and magmatic rocks (ophiolites), adjoin the centralides. The marginal zones of the orogen, called the externides, are composed of flysch.

Kober’s scheme fails to take into account the full diversity of the structure of the mobile belts; the overthrust overlapping of some zones by others, for example, is not obligatory. Moreover, Kober overestimates the role of symmetry in the structure of the orogen. In present-day terminology the term “orogen” is often replaced by such synonyms as “folded mountain structure” or, less precisely, “geosyncline” (in the broad sense of the word) or “geosynclinal system.”


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Orogen investment builds upon the initial 2016 equity commitment of USD 200 million by financial services-focused private equity firm Pine Brook.
Li et al., "Timing and genesis of the adakitic and shoshonitic intrusions in the Laoniushan complex, southern margin of the North China Craton: Implications for post-collisional magmatism associated with the Qinling Orogen," Lithos, vol.
Distal Central Maine/Aroostook-Matapedia units were initially thrust westward over intermediate units, followed by upright folding attributed to the main phase of the Acadian orogen, and finally by shearing in the kilometers-wide Chester shear zone (Ludman 2010).
Palaeozoic tectonics and evolutionary history of the Qinling orogen: evidence from geochemistry and geochronology of ophiolite and related volcanic rocks.
The instruments which are to be installed in the corridors of the Bochnia mine for the determination of deformations of the salt orogen with micrometric accuracy ([10.sup.-3] mm) by the method of crack gauge measurements and with nanometric accuracy ([10.sup.-6] mm) in the case of an interference extensometer with a 50 meter long measure base.
After the conference, Dr Miller will lead a six day field trip to examine key geological aspects of the Damara Orogen.
Field guide to Samos and the Menderes massif; along-strike variations in the Mediterranean Tethyan orogen.
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Orogen Gold PLC (ORE.LN), a mineral exploration company concentrating on gold exploration and development in Eastern Europe, is planning to reopen access to the Deli Jovan gold mines in eastern Serbia.
Elias "orogen" - geologists' word for mountains that grow from collision of tectonic plates.