Record details

Title
    Metamorphic evolution of the contact aureole of the Dipilto Batholith, Eastern Chortis Terrane, Nicaragua
Author
    Buriánek, David
    Dolníček, Zdeněk
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Geosciences
Vol./nr.
    Roč. 56, č. 2011
Pages
    17
Year
    2011
Thesaurus term
    low-pressure metamorphism, fluid inclusions, calc-silicate rocks, Dipilto Batholith, Nicaragua, Eastern Chortis Terrane
Keyword
    Aureole
    Batholith
    Chortis
    Contact
    Dipilto
    Eastern
    Evolution
    Metamorphic
    Nicaragua
    Terrane
Abstract (in english)
   We examined the tectono-metamorphic evolution of the contact aureole around the Cretaceous Dipilto Batholith in the Eastern Chortis Terrane. Three distinct metamorphic phases were distinguished. The first phase represented greenschist-facies regional metamorphism (M1) accompanied by a prograde deformation (D1). The Cretaceous contact-metamorphic event (M2) produced the peak-metamorphic mineral assemblages Wo + Di + Grs + Ves + Qtz + Pl + Kfs in the calc-silicate rocks and Bt + Qtz + Ab + And ? Crd ? Gr ? Chl ? Ms ? Kfs in the metapelites. The estimated P-T conditions near the contact with granitoids are 500-650 °C and ~ 0.2 GPa and coexisting fluids were relatively poor in CO2. The emplacement of the Dipilto Batholith at shallow crustal levels was rarely accompanied by weak deformation of the metasediments (D2). During cooling and exhumation, the contact aureole was locally affected by deformation (D3) and retrograde metamorphism (M3) again under greenschist-facies conditions.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014