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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

International Journal of Earth Sciences

ISSN

1437-3254

e-ISSN

—

Svazek periodika

107

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

36

Strana od-do

1231-1266

Kód UT WoS článku

000433518800004

EID výsledku v databázi Scopus

2-s2.0-85029600008