Volcanic block

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A volcanic block (previously also ejected) is an angular pyroclast with a diameter of more than 64 mm that is ballistically ejected from a volcanic eruption . In the older literature, any pyroclast ejected on a ballistic pathway was considered a bomb . In the more recent literature, however, only pyroclasts of this size class are referred to as volcanic bombs that have rounded shapes or show signs that they were molten when ejected and during transport.

Volcanic block on the crater rim of the Fossa, Vulcano

Characteristics

By definition, volcanic blocks 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 show signs that the pyroclast was created by breaking or fragmenting solidified rock. Pyroclastic rocks , more than 75% of which are 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 ed., 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 guides (vol. 69) Gebr. Bornträger, Stuttgart 1981. ISBN 3-443-15028-4