boudinage

Cylinder-like structures making up a layer of deformed rock.

They commonly lie adjacent to each other and are joined by short necks, giving the appearance of a string of sausages (boudin is French for "sausage"). The necks may be filled with recrystallized minerals such as quartz, feldspar, or calcite. Boudinage occurs in a variety of rock types and is one of the more common structures found in folded rocks.

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      (from French boudin, “sausage”), cylinderlike structures making up a layer of deformed rock. Seen in cross section, the cylinders, or boudins, are generally barrel-shaped but may be lenslike or rectangular. They commonly lie adjacent to each other and are joined by short necks to give the appearance of a string of sausages (hence their name). The thickest boudins are about 20 m (65 feet) thick, and the thinnest about 1 cm (0.39 inch).

      Boudinage results from the stretching of a firm but flexible stratum, as during slip or flexure-slip folding. The exact method of formation is not clearly understood. Generally the boudins lie parallel to the fold axes, but occasionally two sets of mutually perpendicular boudins may occur in the same stratum, one set parallel to the fold axes, the other perpendicular to them. Adjacent weak strata may flow into the necks of the boudins, or the necks may be filled with recrystallized minerals such as quartz, feldspar, or calcite. Boudinage occurs in a variety of rock types and is one of the more common structures found in folded rocks.

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Universalium. 2010.

Look at other dictionaries:

  • Boudinage — is a geological term for structures formed by extension, where a rigid tabular body such as a bed of sandstone, is stretched and deformed amidst less competent surroundings. The competent bed begins to break up, forming sausage shaped boudins.… …   Wikipedia

  • Boudinage —   [budi naːʒə; zu französisch boudin »Blutwurst«] die, / n, Geologie: Bezeichnung für eine tektonische Verformung von dünnen, kompetenten Gesteinslagen, die in plastischerem (inkompetentem) Gestein eingebettet sind: Unter Druckeinwirkung zerreißt …   Universal-Lexikon

  • boudinage — boudiner [ budine ] v. tr. <conjug. : 1> • 1842; de boudin 1 ♦ Techn. Tordre des écheveaux de fil, de soie. Tordre un fil métallique en spirale (opération du boudinage). 2 ♦ Fam. Serrer, en parlant d un vêtement. Cette robe te boudine.… …   Encyclopédie Universelle

  • Boudinage — Boudins von Marmor (weiß) in Kalksilikat Hornfels Boudinage (nach franz. boudin für Blutwurst) bezeichnet in der Geologie eine bestimmte Art von Gesteinsgefüge. Dieses Gefüge entsteht durch die Zerrung von gebankten Gesteinen, wobei Bänke in… …   Deutsch Wikipedia

  • boudinage — Estructuras cilíndricas que conforman una capa de roca deformada. Comúnmente yacen adyacentes entre sí y están unidas por cuellos cortos, dando la apariencia de una tira de salchichas (boudin significa salchicha en francés). Los cuellos pueden… …   Enciclopedia Universal

  • boudinage — (bou di na j ) s. m. Action de tordre le fil de lin avant de le mettre sur les bobines. ÉTYMOLOGIE    Boudiner …   Dictionnaire de la Langue Française d'Émile Littré

  • Boudinage — Bou|di|na|ge [budi na:ʒə] die; , n <zu fr. boudin »Blut , Weißwurst« u. ↑...age> ↑tektonische Verformung von dünnen Gesteinslagen zu wurstförmigen Körpern, die in plastischerem Gestein eingebettet sind (Geol.) …   Das große Fremdwörterbuch

  • boudinage — bou·di·nage …   English syllables

  • boudinage — |büdən|äzh, äj noun ( s) Etymology: French, from boudin + age : a structure which is sometimes present in metamorphic rocks apparently as a result of tension and in which a competent bed is thinned and thickened so that it resembles in cross… …   Useful english dictionary

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