TERMIUM Plus®

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FIAMME [1 record]

Record 1 2010-07-21

English

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

Flattened, elongate, pumice clasts that are found in many welded ignimbrites.

CONT

Fiamme are lens-shaped, usually mm to cm in size, seen on surfaces of some volcaniclastic rocks. They can occur in welded pyroclastic fall deposits and in ignimbrites, which are the deposits of pumiceous pyroclastic density currents.

OBS

The pumice clasts, which are in a hot, plastic state when deposited from the pyroclastic flow, are compressed and flattened by the weight of the overlying ignimbrite body, producing elongated glassy clasts with ragged, flame-like ends ... Many fiamme clasts continue to vesiculate after formation, leading to the development of spherical vesicles within them.

OBS

The name fiamme comes from the Italian word for flames, describing their shape. The term is descriptive and non-genetic.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
DEF

Partie de roche qui possède un aspect aérodynamique en fuseau dû à son façonnement durant son trajet aérien à l'intérieur d'un écoulement pyroclastique.

Spanish

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