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A linear geosynclinal belt lying between continental and oceanic cratons, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal). Also known as geosynclinal couple; primary geosyncline.
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 It might be outdated or ideologically biased.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 geosyncline, either between the continental craton and the oceanic crust or near the margin of a continental mass, capable of alpine folding and frequently associated with primary magmatism. An orthogeosyncline has a significant longitudinal trend and is the parent of folded mountain structure. It usually consists of longitudinal belts, both eugeosynclinal, with intensive magmatism, and miogeosynclinal, with little or no magmatism. The term “orthogeosyncline” was proposed in 1940 by the German geologist H. Stille.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.