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