welded tuff

welded tuff
ignimbrite.

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      rock composed of compacted volcanic ejecta (see tuff).

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Universalium. 2010.

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  • welded tuff — noun : a tuff deposit sufficiently thick and hot at the time of emplacement that the fragments soften and coalesce to form a rock which simulates rhyolite or obsidian * * * Petrol. ignimbrite …   Useful english dictionary

  • welded tuff —    A glass rich, pyroclastic rock composed of volcanic ash indurated at the time of deposition by the welding together of its glass shards under the combined action of the heat retained by particles, the weight of overlying material, and hot… …   Glossary of landform and geologic terms

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  • Tuff — (from the Italian tufo ) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff should not be confused with tufa , another type of rock. Volcanic ashThe products of a volcanic eruption are… …   Wikipedia

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  • Ignimbrite — is a volcanic pyroclastic rock, often of dacitic or rhyolitic composition. Ignimbrite is the deposit of a pumice rich pyroclastic density current, or pyroclastic flow , a hot suspension of particles and gases that flows rapidly from a volcano,… …   Wikipedia

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