Dacite


Dacite
Le dôme du volcan Saint Helens est constitué de dacite.

La dacite est une roche magmatique volcanique microlithique composée de quartz, de plagioclase, de verre et de minéraux ferromagnésiens : biotite, hornblende ou pyroxène.

Le nom dacite vient de la Dacie, ancien nom de la Transylvanie en Roumanie.

Gisement

On trouve la dacite en petites coulées de lave.


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Regardez d'autres dictionnaires:

  • Dacite — Aphanitic QAPF diagram denoting daci …   Wikipedia

  • dacite — ● dacite nom féminin (de Dacie, nom propre) Roche volcanique, voisine des andésites, mais plus siliceuse. (Les laves dacitiques sont visqueuses et forment des extrusions, par exemple l aiguille de la montagne Pelée.) dacite [dasit] n. f. ÉTYM.… …   Encyclopédie Universelle

  • dacite — ALASKA VOLCANO OBSERVATORY GLOSSARY Volcanic rock (or lava) that characteristically is light in color and contains 62% to 69% silica and moderate a mounts of sodium and potassium. GLOSSARY OF VOLCANIC TERMS A generally light colored, relatively… …   Glossary of volcanic terms

  • dacite — da·cite (dāʹsīt ) n. A light gray volcanic rock containing a mixture of plagioclase and other crystalline minerals in glassy silica, similar in appearance to rhyolite.   [After Dacia.] * * * ▪ mineral       volcanic rock that may be considered a… …   Universalium

  • dacite — noun An igneous, volcanic rock with a high iron content …   Wiktionary

  • dacite — da·cì·te s.f. TS petr. roccia vulcanica cristallina formata da plagioclasio e quarzo, con biotite, orneblenda e pirosseno {{line}} {{/line}} DATA: 1955. ETIMO: der. di Dacia, v. anche dacico, con 2 ite …   Dizionario italiano

  • dacite — pl.f. daciti …   Dizionario dei sinonimi e contrari

  • dacite — [ deɪsʌɪt] noun Geology a volcanic rock resembling andesite but containing free quartz. Derivatives dacitic adjective Origin C18: from the name of the ancient Roman province of Dacia in SE Europe (as the rock was first found in the Carpathian… …   English new terms dictionary

  • dacite — da·cite …   English syllables

  • dacite — noun a grey volcanic rock containing plagioclase and quartz and other crystalline minerals • Derivationally related forms: ↑dacitic • Hypernyms: ↑volcanic rock • Substance Meronyms: ↑plagioclase, ↑oligoclase …   Useful english dictionary


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