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WELDED IGNIMBRITE [1 record]

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Record 1 2009-06-10

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
CONT

If sufficiently hot when deposited, the particles in an ignimbrite may weld together, and the deposit is transformed into a "welded ignimbrite," made of eutaxitic lapilli-tuff. When this happens, the pumice lapilli commonly flatten, and these appear on rock surfaces as dark lense-shapes, known as fiamme. Intensely welded ignimbrite may have glassy zones near the base and top, called lower and upper "vitrophyres," but central parts are microcrystalline ("lithoidal").

OBS

Many ignimbrites are loose, unconsolidated deposits, but some exhibit welding, giving the ignimbrite the texture of a solid rock mass, hence the terms commonly used to describe these examples: welded tuff and welded ashflow.

OBS

welded ignimbrite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Ignimbrites soudées en conditions sous-aquatiques : l'exemple du Viséen des Vosges du Sud (France).

OBS

ignimbrite soudée : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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