ignimbrite

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The Campanian Ignimbrite (CI) is a large-volume trachytic tuff erupted at 37 ka from the Campi Flegrei and composed of a fallout deposit overlain by ignimbrite.

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Examples (6)

  • The Campanian Ignimbrite (CI) is a large-volume trachytic tuff erupted at 37 ka from the Campi Flegrei and composed of a fallout deposit overlain by ignimbrite. —  CiteULike: Everyone's library
  • The ignimbrite was spread over an area of about 30,000 km2 including the Campanian Plain and the Apennine Mountains, with ridges over 1000 m a.s.l. The pumice fragments of the CI range in composition from trachyte to phonolitic-trachyte (DI = 75-90). —  CiteULike: Everyone's library
  • Pumice fragments of intermediate composition (DI = 84-87) occur in the ignimbrite on the Apennine Mountains and Roccamonfina volcano, up to 65 km from the vent. —  CiteULike: Everyone's library
  • The observed compositional variation between most - and least-evolved ignimbrite was generated in part by crystal-liquid fractionation, although other magmatic processes such as syn-eruptive mingling between most - and least-evolved magmas accounts for the mineralogical disequilibria and for the bimodality of the glass compositions in the intermediate-composition rocks. —  CiteULike: Everyone's library
  • Geochemical, mineralogic, stratigraphic and volcanologic data, together with the stratigraphic relations between most -, intermediate - and least-evolved ignimbrite as detected at Mondragone and from bore-hole drillings suggest that: (1) the CI magmatic system was composed of two distinct magma layers - the upper layer was more differentiated and homogeneous in composition, while the deeper was less evolved and slightly zoned; and (2) the CI was mostly emplaced in three main pulses of pyroclastic flows that tapped the chamber at variable levels and with distinct withdrawal dynamics. —  CiteULike: Everyone's library
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Etymologies (1)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Latin ignis, fire + imber, imbr-, rain + -ite1.
 

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