Coladas piroclásticas relacionadas con el colapso de domos traquíticos en el Edificio Volcánico Mioceno Medio de Jandía (Fuerteventura, Islas Canarias)

  1. Ramón Casillas Ruiz 1
  2. Guillermo Martín García 1
  1. 1 Departamento de Biología Animal, Edafología y Geología. Facultad de Ciencias. C/ Astrofísico Sánchez s/n. Universidad de La Laguna. 38206. La Laguna. Santa Cruz de Tenerif
Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2021

Issue: 69

Pages: 35-38

Type: Article

Export: RIS

Abstract

The eastern sector of the Middle Miocene Jandía Volcanic Edifice is essentially constituted by a sequence of felsic domes and pyroclas- tic rocks separated by basaltic agglomerates that mark important events of erosion and volcanic activity gaps. Pyroclastic levels, which include welded felsic tuffs and interstratified levels of pumice, ashs and lapilli, are interpreted as the result of pyroclastic flows (block and ash flows) and pyroclastic surges (base surges, ash cloud surges and ground surges) deposits, related to the volcanic activity of trachytic domes, such as the Cofete Islet dome, originated by hydromagmatic eruptions (base surge deposits) and explosive gravitational collapse of domes (block and ash flow deposits). Ash cloud surges and ground surges associated to the block and ash flows are forming underlying, interstratified and overlying deposits to the welded felsic tuffs. Some of these pyroclastic surges surpassed the stoppage zone of the pyro- clastic flows, reaching areas located far from the erupting domes.