pyroclastics - ορισμός. Τι είναι το pyroclastics
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Τι (ποιος) είναι pyroclastics - ορισμός

ROCKS COMPOSED SOLELY OR PRIMARILY OF FRAGMENTS DERIVED FROM EXPLOSIVE VOLCANIC ACTIVITY
Pyroclastic; Pyroclastic rocks; Pyroclastics; Pyroclastic material; Pyroclastic deposit
  • Rocks from the [[Bishop Tuff]], uncompressed with [[pumice]] on left; compressed with [[fiamme]] on right.
  • Katla]] in [[Iceland]]. Find spot: Beach near [[Vik]] at the end of road 215. Acquisition done using "CT Alpha" by "Procon X-Ray GmbH", Garbsen, Germany. Resolution 11,2μm/[[Voxel]], width approx. 24 mm.
  • 3D-Rendering of the above image stack, in parts transparent. Heavy particles in red.

pyroclastics         
pyroclastic material.
Pyroclastic fall         
  • Izu Oshima]] volcano in Japan. The ash fell on an uneven ground surface. The ash layers have not been folded after deposition.
DEPOSIT OF MATERIAL EJECTED FROM A VOLCANIC ERUPTION
Pyroclastic air fall
A pyroclastic fall is a uniform deposit of material which has been ejected from a volcanic eruption or plume such as an ash fall or tuff. Pyroclastic air fall deposits are a result of:
Pyroclastic surge         
  • Dune bedform formed by the pyroclastic currents related to the 2006 eruption of Tungurahua (Ecuador). A. Outer shape of a lunate dune bedform and B. internal lamination. Note preferential aggradation on upstream face (backset laminations).<ref name=":1" />
LOW-DENSITY FLOW OF FLUIDIZED MASS OF TURBULENT GAS AND ROCK FRAGMENTS WHICH IS EJECTED DURING SOME VOLCANIC ERUPTIONS
Base surge
A pyroclastic surge is a fluidised mass of turbulent gas and rock fragments that is ejected during some volcanic eruptions. It is similar to a pyroclastic flow but it has a lower density or contains a much higher ratio of gas to rock,"Glossary of Volcano and Related Terminology". USGS Cascades Volcano Observatory. Retrieved on 2011-04-23. which makes it more turbulent and allows it to rise over ridges and hills rather than always travel downhill as pyroclastic flows do.

Βικιπαίδεια

Pyroclastic rock

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. The individual rock fragments are known as pyroclasts. Pyroclastic rocks are a type of volcaniclastic deposit, which are deposits made predominantly of volcanic particles. 'Phreatic' pyroclastic deposits are a variety of pyroclastic rock that forms from volcanic steam explosions and they are entirely made of accidental clasts. 'Phreatomagmatic' pyroclastic deposits are formed from explosive interaction of magma with groundwater.

Unconsolidated accumulations of pyroclasts are described as tephra. Tephra may become lithified to a pyroclastic rock by cementation or chemical reactions as the result of the passage of hot gases (fumarolic alteration) or groundwater (e.g. hydrothermal alteration and diagenesis) and burial, or, if it is emplaced at temperatures so hot that the soft glassy pyroclasts stick together at point contacts, and deform: this is known as welding.

One of the most spectacular types of pyroclastic deposit is an ignimbrite, which is the deposit of a ground-hugging pumiceous pyroclastic density current (a rapidly flowing hot suspension of pyroclasts in gas). Ignimbrites may be loose deposits or solid rock, and they can bury entire landscapes. An individual ignimbrite can exceed 1000 km3 in volume, can cover 20,000 km2 of land, and may exceed 1 km in thickness, for example where it is ponded within a volcanic caldera.