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Title: Geological characterization of lapilli in Gran Canaria island : a raw material used as a gas granular filter
Authors: Lomoschitz, Alejandro 
Mangas, José 
Socorro Domínguez, Miguel Ángel 
UNESCO Clasification: 250613 Petrología ígnea y metamórfica
Keywords: Lapilli
Issue Date: 2003
Publisher: Universidad de Las Palmas de Gran Canaria (ULPGC) 
Conference: IV European Meeting on Chemical Industry and Environment 
Abstract: Lapilli is a pyroclastic material ejected by volcanoes (2-64 mm of grain size ). Lapillis from recent strombolian eruptions of Gran Canaria have been used as a granular filter for removing fine dust particles from gases and for heat exchange as well. The geological characteristics of these lapillis are: A) They come from ultrabasic geochemical composition magmas (<45% content of Si 02, and >3% ofNa2o+K20); B) Petrologic features indicate lapillis are mainly basanitic and nephelinitic in composition; C) Lapilli textures varíes from holohyaline ( l 00% of volcanic glass) to hypocrystalline (glass plus crystals), are black, slightly welded and very vesicular, consequently they have high porosity and penneability; D) Toe most interesting lapillis to be used as granular filters are of Upper Quaternary age ( < 300,000 years) because of their low weathering and cohcsiveness; E) Calculated reserves of this material in Gran Canaria are large, up to 350 million m3, but many of the recent volcanic eones are located in natural places protected by Law. However, the local demand of lapilli as raw material of granular filters ( <100 m3/year) could be satisfied with quarries now available.
ISBN: 8489528608
Source: European Meeting on Chemical Industry and Environment (4º. 2003 . Las Palmas de Gran Canaria) : Chemical industry and environment IV, edited by Agustín Macías Machín and Jesús Joaquín Umbría Ramos, Las Palmas de Gran Canaria : Universidad, Grupo de Energía y Medio Ambiente, v. 1, p. 21-32
Appears in Collections:Ponencias
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