nuée ardente eruption of Mt. Pyroclast definition is - a fragment of detrital volcanic material that has been expelled aerially from a vent. Definition & Types 6:08 The individual rock fragments are known as pyroclasts.Pyroclastic rocks are a type of volcaniclastic deposit, which are deposits made predominantly of volcanic paticles. Where the volcanic material has been transported and reworked through mechanical action, such as by wind or water, these rocks are termed volcaniclastic. Learn more. Pyroclastic definition: (of rocks) formed from the solid fragments ejected during a volcanic eruption | Meaning, pronunciation, translations and examples St. Helens, Skamania County, Washington August 7, 1980 n. pl. Pyroclastic flows leave behind layers of debris anywhere from less than a … See more. Pyroclastic texture results from the explosive fragmentation of volcanic material, including magma (commonly the light, frothy pumice variety and glass fragments called shards), country rock, and phenocrysts. Pyroclastic Flow Hazards Pyroclastic flows are so fast and so hot that they can knock down, shatter, bury, or burn anything in their path. pyroclastic meaning: 1. consisting of or relating to small pieces of rock from a volcano: 2. consisting of or relating…. Survey of Physical Geography ... A pyroclastic flow is a dense collection of fragments and gases from a volcanic eruption that flows down the slope of a volcano. Even small flows can destroy buildings, flatten forests, and scorch farmland. A pyroclastic flow, pronounced pie-roh-class-tick, (also known as a pyroclastic density current) is a flow of "lava", as commonly associated with volcanic eruptions.The flows are currents of hot gas, or tephra, during an eruption that sometimes causes rock falls.A cloud forms over the river of hot rock. What does pyroclastic-surge mean? Pyroclastic rocks (derived from the Greek: πῦρ, meaning fire; and κλαστός, meaning broken) are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. Pyroclastic definition, composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic. A pyroclastic flow may contain a mix of rock fragments ranging up to the size of boulders, with the heavier fragments moving along closer to the ground. (volcanology) A fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions. Pyroclastic flow synonyms, Pyroclastic flow pronunciation, Pyroclastic flow translation, English dictionary definition of Pyroclastic flow. Pyroclastic rocks or pyroclastics (derived from the Template:Lang-el, meaning fire; and Template:Lang, meaning broken) are clastic rocks composed solely or primarily of volcanic materials. pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption.
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