Počet záznamů: 1  

Role of strain localization and melt flow on exhumation of deeply subducted continental crust

  1. 1.
    SYSNO ASEP0494976
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevRole of strain localization and melt flow on exhumation of deeply subducted continental crust
    Tvůrce(i) Závada, Prokop (GFU-E) ORCID, RID
    Schulmann, K. (CZ)
    Racek, M. (CZ)
    Hasalová, P. (CZ)
    Jeřábek, P. (CZ)
    Weinberg, R. F. (AU)
    Štípská, P. (CZ)
    Roberts, A. (AU)
    Zdroj.dok.Lithosphere. - : GeoScienceWorld - ISSN 1941-8264
    Roč. 10, č. 2 (2018), s. 217-238
    Poč.str.22 s.
    Forma vydáníTištěná - P
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovaCentral European Variscides ; Bohemian massif ; partially molten rocks
    Vědní obor RIVDB - Geologie a mineralogie
    Obor OECDGeology
    CEPGA14-15632S GA ČR - Grantová agentura ČR
    Institucionální podporaGFU-E - RVO:67985530
    UT WOS000433166500003
    EID SCOPUS85044764112
    DOI10.1130/L666.1
    AnotaceA section of anatectic felsic rocks from a high-pressure (>13 kbar) continental crust (Variscan Bohemian Massif) preserves unique evidence for coupled melt flow and heterogeneous deformation during continental subduction. The section reveals layers of migmatitic granofels interlayered with anatectic banded orthogneiss and other rock types within a single deformation fabric related to the prograde metamorphism. Granofels layers represent high strain zones and have traces of localized porous melt flow that infiltrated the host banded orthogneiss and crystallized granitic melt in the grain interstices. This process is inferred from: (1) gradational contacts between orthogneiss and granofels layers, (2) grain size decrease and crystallographic preferred orientation of major phases, compatible with oriented growth of crystals from interstitial melt during granular flow, accommodated by melt-assisted grain boundary diffusion creep mechanisms, and (3) pressure-temperature equilibria modeling showing that the melts were not generated in situ. We further argue that this porous melt flow, focused along the deformation layering, significantly decreases the strength of the crustal section of the subducting continental lithosphere. As a result, detachment folds develop that decouple the shallower parts of the layered anatectic sequence from the underlying and continuously subducting continental plate, which triggers exhumation of this anatectic sequence.
    PracovištěGeofyzikální ústav
    KontaktHana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
    Rok sběru2019
Počet záznamů: 1  

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