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Failed Silurian continental rifting at the NW margin of Gondwana: evidence from basaltic volcanism of the Prague Basin (Teplá–Barrandian Unit, Bohemian Massif)

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000008" target="_blank" >RIV/00025798:_____/18:00000008 - isvavai.cz</a>

  • Result on the web

    <a href="https://rd.springer.com/article/10.1007/s00531-017-1530-5" target="_blank" >https://rd.springer.com/article/10.1007/s00531-017-1530-5</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/s00531-017-1530-5" target="_blank" >10.1007/s00531-017-1530-5</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Failed Silurian continental rifting at the NW margin of Gondwana: evidence from basaltic volcanism of the Prague Basin (Teplá–Barrandian Unit, Bohemian Massif)

  • Original language description

    The Silurian volcanic rocks of the Prague Basin represent within-plate, transitional alkali to tholeiitic basalts, which erupted in a continental rift setting through the thick Cadomian crust of the Teplá–Barrandian Unit (Bohemian Massif). Despite the variable, often intense alteration resulting in postmagmatic replacement of the basalt mass due to carbonatization, the geochemical signatures of Silurian basalts are still sufficiently preserved to constrain primary magmatic processes and geotectonic setting.The studied interval of Silurian volcanic activity ranges from Wenlock (Homerian, ~431 Ma) to lateLudlow (Gorstian, ~425 Ma) with a distinct peak at the Wenlock/Ludlow boundary (~428 Ma). Traceelement characteristics unambiguously indicate partial melting of a garnet peridotite mantle source.Wenlock basalts are similar to alkaline OIB with depleted radiogenic Nd signature compared to Ludlowbasalts, which are rather tholeiitic, EMORB-like with enriched radiogenic Nd signature. The correlation ofpetrogenetically significant trace-element ratios with Nd isotopic compositions points to a mixing of partialmelts of an isotopically heterogeneous, possibly two-component mantle source during the Wenlock–Ludlow melting. Lava eruptions were accompanied by intrusions of doleritic basalt and meimechite sills.The latter represent olivine-rich cumulates of basaltic magmas of probably predominantly Ludlow age.Meimechites with dolerites and, to a lesser extent, some lavas were subject to alteration due to wall-rock–fluid interaction. The trigger for the Wenlock-to-Ludlow (431–425 Ma) extension and related volcanism inthe Prague Basin is related to far-field forces, namely slab-pull regime due to progressive closure of theIapetus Ocean. The main stage of the Baltica–Laurentia collision then caused the Prague Basin rift failureat ca. 425 Ma that has never reached an oceanic stage.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10505 - Geology

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2018

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    International Journal of Earth Sciences

  • ISSN

    1437-3254

  • e-ISSN

  • Volume of the periodical

    107

  • Issue of the periodical within the volume

    4

  • Country of publishing house

    DE - GERMANY

  • Number of pages

    36

  • Pages from-to

    1231-1266

  • UT code for WoS article

    000433518800004

  • EID of the result in the Scopus database

    2-s2.0-85029600008