Record details

Title
    Volcanic history of the Conchagua Peninsula (eastern El Salvador)
Author
    Bellon, Hervé
    Erban, Vojtěch
    Fárová, Kateřina
    Hernández, Walter
    Kopačková, Veronika
    Rapprich, Vladislav
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Geosciences
Vol./nr.
    Roč. 55, č. 2
Pages
    18
Year
    2010
Thesaurus term
    La Unión, Conchagua Volcano, volcanism, volcanostratigraphy, Central American volcanic chain, Comayagua Graben
Keyword
    Conchagua
    Eastern
    El
    History
    Peninsula
    Salvador
    Volcanic
Abstract (in english)
   Volcanism in the area was controlled by intersection of three tectonic structures: Central Graben, Comayagua Graben and Guayape Fault Zone. The basement is built of rhyolitic Playitas ignimbrite. The pyroclastic rocks of La Unión unit (13.3 Ma) display signs of mingling between basalt and dacite. Rocks of the subsequent Pozo unit are strongly altered. Pilón Lavas are dominated by andesite and basaltic andesite. Pleistocene volcanic activity is represented by the Pre-Conchagua edifice (1.6 Ma), Cerro Montoso and Juana-Pancha. Some lavas of the Pre-Conchagua - Juana-Pancha are compositionally distinct from common volcanic front products, resembling the lavas of Tegucigalpa volcanic field. Behind-arc extension could have facilitated the magma genesis via decompression melting of the mantle. The current Conchagua Volcano is built by repeated Strombolian eruptions associated with basaltic lavas.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014