Record details

Title
    Geochemistry and genesis of behind-arc basaltic lavas from eastern Nicaragua
Author
    Bellon, Hervé
    Erban, Vojtěch
    Holub, František
    Janoušek, Vojtěch
    Magna, Tomáš
    Mlčoch, Bedřich
    Rapprich, Vladislav
    Wiechert, Uwe
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Volcanology and Geothermal Research
Vol./nr.
    Roč. 192, č. 3-4
Pages
    25
Year
    2010
Thesaurus term
    Back-arc volcanism
    Back-arc volcanism, Central American Volcanic Arc, whole-rock geochemistry, Li-Sr-Nd-Pb isotopes, K-Ar dating
    Central American Volcanic Arc
    K-Ar dating
    Li-Sr-Nd-Pb isotopes
    whole-rock geochemistry
Keyword
    Basaltic
    Behind-arc
    Eastern
    Genesis
    Geochemistry
    Lavas
    Nicaragua
Abstract (in english)
   The petrology and chemistry of the Behind the Volcanic Front (BVF) lavas from eastern Nicaragua illustrate the complex nature of sources and processes. The older, Early Miocene (~17 Ma) low-Ti basalts-andesites are characterized by a strong LILE/HFSE depletion. They are interpreted as relics of Early Miocene volcanic arc, largely analogous to the extinct Coyol arc further W. The prevalent high-Ti lavas are represented both by alkaline (Quaternary trachybasalts: Volcán Azul and Kukra Hill) and subalkaline (basalts-basaltic andesites: Late Miocene, ~ 11 Ma Great Corn Island and Quaternary, Pearl Lagoon) volcanic rocks. All probably represent small-volume decompression melts of an OIB-like source with a strong Galápagos mantle imprint. The positive Sr-Nd isotopic correlation indicates an interaction between this component and a depleted mantle modified slightly by subduction-related influx of mainly Sr and Li. This feeble signal stems most likely from the Miocene convergence episode.

   The petrology and chemistry of the Behind the Volcanic Front (BVF) lavas from eastern Nicaragua illustrate the complex nature of sources and processes. The older, Early Miocene (~17 Ma) low-Ti basalts--andesites are characterized by a strong LILE/HFSE depletion. They are interpreted as relics of Early Miocene volcanic arc, largely analogous to the extinct Coyol arc further W. The prevalent high-Ti lavas are represented both by alkaline (Quaternary trachybasalts: Volcán Azul and Kukra Hill) and subalkaline (basalts--basaltic andesites: Late Miocene, ~ 11 Ma Great Corn Island and Quaternary, Pearl Lagoon) volcanic rocks. All probably represent small-volume decompression melts of an OIB-like source with a strong Galápagos mantle imprint. The positive Sr--Nd isotopic correlation indicates an interaction between this component and a depleted mantle modified slightly by subduction-related influx of mainly Sr and Li. This feeble signal stems most likely from the Miocene convergence episode.
Contributor
    Česká geologická služba
    UK Praha, Přírodovědecká fakulta
Contributor code
    ČGS (RIV)
    UK, PřF
Source format
    R
Import date
    8. 8. 2012
    15. 10. 2014