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Pyroclastic rock

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  • Pyroclastic rock — Pyroclastic rocks or pyroclastics (derived from the Greek πῦρ , meaning fire, and κλαστός , meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked… …   Wikipedia

  • pyroclastic rock — noun Any rock formed by the accumulation of fragmented volcanic material (pyroclasts) ejected during explosive eruptions …   Wiktionary

  • Pyroclastic flow — Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 …   Wikipedia

  • Pyroclastic surge — A pyroclastic surge is a fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions. It is similar to a pyroclastic flow but contains a much higher proportion of gas to rock, which makes it more turbulent… …   Wikipedia

  • Pyroclastic fall — A pyroclastic fall is a uniform deposit of material which has been ejected from an eruption or plume such as an ash fall or tuff. Pyroclastic flows occur relatively spontaneously in the geological time scale and are great indicators of time.… …   Wikipedia

  • pyroclastic Geology — [ˌpʌɪrə(ʊ) klastɪk] adjective of or denoting rock fragments or ash erupted by a volcano, especially as a hot, dense, destructive flow. noun (pyroclastics) pyroclastic material. Derivatives pyroclast noun …   English new terms dictionary

  • Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… …   Wikipedia

  • pyroclastic flow — ▪ volcanism       in a volcanic eruption, a fluidized mixture of hot rock fragments, hot gases, and entrapped air that moves at high speed in thick, gray to black, turbulent clouds that hug the ground. The temperature of the volcanic gases can… …   Universalium

  • pyroclastic flow — ALASKA VOLCANO OBSERVATORY GLOSSARY A dense, hot, chaotic avalanche of rock fragments, gas, and ash that travels rapidly away from an explosive eruption column, down the flanks of the volcano (synonymous with ash flow ). Pyroclastic flows move at …   Glossary of volcanic terms

  • Pyroclastic Peak — Infobox Mountain Name=Pyroclastic Peak Photo= South Face of Pyroclastic Peak.jpg Caption= South face of Pyroclastic Peak Elevation=Convert|2349|m|ft|0|abbr=on Location=British Columbia, Canada Range=Pacific Ranges Prominence =… …   Wikipedia

  • pyroclastic surge — ALASKA VOLCANO OBSERVATORY GLOSSARY A low density, turbulent flow of fine grained volcanic rock debris and hot gas. Pyroclastic surges differ from pyroclastic flows in that they are less dense and tend to travel as a low, ground hugging, but… …   Glossary of volcanic terms