Volcanic block

A volcanic block ( formerly outcast ) is a ballistic flung out during a volcanic eruption square Pyroklast with a diameter of more than 64 mm. In the older literature, each was on a ballistic trajectory ejected Pyroklast as a bomb. In the recent literature, however, only pyroclastic this size class are called volcanic bombs, which have rounded shapes and show evidence that they were molten during the strike and during transport.

Characteristics

Volcanic blocks by definition have a diameter of> 64 mm; However, they can reach a diameter of several meters. They have angular and angular shapes. The external shape and surface have evidence that the Pyroklast caused by rupture or fragmentation of the solidified rocks. Pyroclastic rocks that consist of more than 75 % as volcanic blocks are called pyroclastic breccias.

Swell

  • Roger Walter Le Maitre: Igneous rocks: IUGS ​​classification and glossary; recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks. 2nd edition, 236 pp., New York, Cambridge University Press 2002, ISBN 0 - 521-66215 -X
  • Hans Pichler: Italian volcanic areas III, Lipari, Vulcano, Stromboli, Tyrrhenian Sea. In: Collection of geological leader (Vol. 69) Gebr Bornträger, Stuttgart 1981, ISBN 3-443-15028-4.
  • Pyroclastic rock
  • Sedimentation
Tephra
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