columnar jointing

GLOSSARY OF VOLCANIC TERMS
A type of fracture pattern resulting from the thermal contraction of hot volcanic rocks after their crystallization which commonly is expressed in elongate, pentagonal or hexagonal columns oriented perpendicular to the cooling surface. Columnar jointing is common in all compositions of lava flows, although it is generally best developed in mafic (basalt) lava flows and in felsic welded tuffs.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

Look at other dictionaries:

  • columnar jointing — /kəˌlʌmnə ˈdʒɔɪntɪŋ/ (say kuh.lumnuh joynting) noun that variety of jointing which breaks the rock into columns, especially of basaltic rock in which the joints form a hexagonal pattern by shrinkage during cooling …   Australian English dictionary

  • columnar jointing — (in basaltic igneous rocks) a series of generally hexagonal columns formed by vertical joints as a result of contraction during cooling. * * * …   Universalium

  • columnar jointing — (in basaltic igneous rocks) a series of generally hexagonal columns formed by vertical joints as a result of contraction during cooling …   Useful english dictionary

  • Disyunción columnar — en basaltos de la isla Porto Santo. La disyunción columnar es un tipo de diaclasa que se forma por tensiones cuando lava o magma se enfría.[1 …   Wikipedia Español

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  • joint — /joynt/, n. 1. the place at which two things, or separate parts of one thing, are joined or united, either rigidly or in such a way as to permit motion; juncture. 2. a connection between pieces of wood, metal, or the like, often reinforced with… …   Universalium

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