Počet záznamů: 1  

Middle/Late Cambrian intracontinental rifting in the central West Sudetes, NE Bohemian Massif (Czech Republic): geochemistry and petrogenesis of the bimodal metavolcanic rocks

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    SYSNO ASEP0145353
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevMiddle/Late Cambrian intracontinental rifting in the central West Sudetes, NE Bohemian Massif (Czech Republic): geochemistry and petrogenesis of the bimodal metavolcanic rocks
    Tvůrce(i) Dostal, J. (CA)
    Patočka, František (GLU-S) SAI
    Pin, CH. (FR)
    Zdroj.dok.Geological Journal - ISSN 0072-1050
    Roč. 36, č. 1 (2001), s. 1-17
    Poč.str.17 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovabimodal metavolcanics ; Early Palaeozoic ; northern Gondwana
    Vědní obor RIVDB - Geologie a mineralogie
    CEPGA205/93/0341 GA ČR - Grantová agentura ČR
    IAA3111102 GA AV ČR - Akademie věd
    CEZAV0Z3013912 - GLU-S
    UT WOS000168302400001
    EID SCOPUS0035050075
    DOI10.1002/gj.872
    AnotaceThe Early Palaeozoic East Krkonoše Complex situated in the central West Sudetes, NE Bohemian Massif, is a volcano-sedimentary suite containing abundant mafic and felsic volcanics metamorphosed to greenschist facies.The trace element distribution patterns and Nd isotope signatures (ENd500 = +3.1 to +6.6) of the metabasalts indicate that they may be related to a rising mantle diapir associated with intracontinental rifting. At the early stage, limited melting of an upwelling asthenosphere produced alkali basalts and enriched tholeiites which compositionally resembled oceanic island basalts. A later stage of rifting larger degrees of melting at shallower depths generated tholeiitic basalts with E-MORB to N-MORB characteristics.The values of (87Sr/86Sr)i = 0.706 and ENd500 = -5,1 of the metarhyolites as well as the lack of rocks with intermediate composition suggest that the felsic rocks were formed by partial melting of continental crust triggered by mantle melts.The geochemistry of the bimodal metavolcanics and their association with abundant terrigenous metasediments suggest that the felsic-mafic volcanic suite was generated during an early stage of intracontinental rifting. This process, widespread in Western and Central Europe during the Early Palaeozoic, is an evidence of large-scale fragmentation of the northern margin of the Gondwana supercontinent.
    PracovištěGeologický ústav
    KontaktJana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
    Rok sběru2002

Počet záznamů: 1  

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