Diatrème


Diatrème

Un diatrème (du grec diatrêma, perforation (dia = à travers) est une cheminée volcanique emplie de brèches volcaniques dues à des explosions. Ces explosions sont généralement la conséquence d'une vaporisation brutale d'eaux phréatiques lors de leur mise en contact avec des laves ascendantes. Le débouché à la surface apparaît soit comme cratère d'explosion de type maar, soit comme un cône de tuf volcanique. Le produit résultant peut aussi être une roche du type pépérite.

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  • Diatreme — The Moses Rock Dike diatreme, Cane Valley, Utah. A diatreme is a breccia filled volcanic pipe that was formed by a gaseous explosion. Diatremes often breach the surface and produce a tuff cone, a filled relatively shallow crater known as a maar,… …   Wikipedia

  • diatreme — /duy euh treem /, n. Geol. a volcanic vent produced in a solid rock structure by the explosive energy of gases in magmas. [1930 35; DIA + Gk trêma hole] * * * …   Universalium

  • diatreme — noun A cone shaped volcanic vent produced by the explosion of gas filled magma …   Wiktionary

  • diatreme —    A breccia filled volcanic pipe that was formed by a gaseous explosion (e.g., hydrovolcanic eruption); commonly, but not exclusively associated with exposed throat or neck of maar, as in the Hopi Buttes area of northeastern Arizona.    Compare …   Glossary of landform and geologic terms

  • diatreme — GLOSSARY OF VOLCANIC TERMS A funnel shaped, pipe like volcanic conduit, usually filled with volcaniclastic debris, emplaced by the explosive energy of gas charged magmas. Diatremes are believed to result from hydrovolcanic fragmentation and… …   Glossary of volcanic terms

  • diatreme — [ dʌɪətri:m] noun Geology a long vertical pipe or plug formed when gas filled magma forced its way up through overlying strata. Origin early 20th cent.: from dia + Gk trēma perforation …   English new terms dictionary

  • diatreme — di·a·treme …   English syllables

  • diatreme — /ˈdaɪətrim/ (say duyuhtreem) noun Geology a volcanic vent, typically filled with breccia, produced by the explosive action of gases in magma. {dia + Greek trema hole} …   Australian English dictionary

  • diatreme — ˈdīə.ˌtrēm noun ( s) Etymology: dia + Greek trēma hole more at throw : a small generally circular volcanic vent produced by gaseous explosion usually preceded by deep seated rock fusion by hot gases …   Useful english dictionary

  • Cross diatreme — Elevation 2,200 m (7,218 ft) Location Location …   Wikipedia