Neoproterozoic to Cenozoic magmatism in the central part of the Bohemian Massif (Czech Republic): Isotopic tracking of the evolution of the mantle through the Variscan orogeny

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F19%3A00503956" target="_blank" >RIV/67985831:_____/19:00503956 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0024493718304900?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0024493718304900?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.lithos.2018.12.028" target="_blank" >10.1016/j.lithos.2018.12.028</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Neoproterozoic to Cenozoic magmatism in the central part of the Bohemian Massif (Czech Republic): Isotopic tracking of the evolution of the mantle through the Variscan orogeny

Popis výsledku v původním jazyce

The evolution of the mantle source beneath the Teplá-Barrandian block of the Bohemian Massif (Czech Republic) is tracked from the Late Neoproterozoic to the Cenozoic in order to examine the coupling between the crust and underlying continental lithospheric mantle (CLM) during the Late Paleozoic Variscan orogeny. Late Neoproterozoic mafic rocks occur as two types. The oldest type resembles N-MORB, whereas the youngest is characterized by moderate LREE enrichment and within-plate trace element characteristics. Taken together, the geochemistry of the mafic rocks suggests they were emplaced in an intra-oceanic back-arc basin to within-plate setting. Early Paleozoic (Ordovician to Early Devonian) mafic rocks are alkaline, enriched in LREE and Nb relative to HREE and were probably derived from a garnet lherzolite mantle source. Late Paleozoic mafic magmatism occurred during the extensional collapse phase of the Variscan orogen, in the aftermath of the collision between Gondwana and Laurussia. The basalts are within-plate, and transitional between alkaline and tholeiitic compositions but show a relative depletion of Nb. Cenozoic volcanic rocks in the Teplá-Barrandian zone are local representatives of regionally extensive Late Cretaceous to Cenozoic Central European Volcanic Province. The rocks are within-plate, alkaline basalts enriched in LREE and Nb and were derived from garnet lherzolite mantle. These data suggest significant input from upwelling asthenospheric mantle, implying that part of the Permian CLM mantle was re-fertilized by a juvenile post-Variscan CLM.

Název v anglickém jazyce

Neoproterozoic to Cenozoic magmatism in the central part of the Bohemian Massif (Czech Republic): Isotopic tracking of the evolution of the mantle through the Variscan orogeny

Popis výsledku anglicky

The evolution of the mantle source beneath the Teplá-Barrandian block of the Bohemian Massif (Czech Republic) is tracked from the Late Neoproterozoic to the Cenozoic in order to examine the coupling between the crust and underlying continental lithospheric mantle (CLM) during the Late Paleozoic Variscan orogeny. Late Neoproterozoic mafic rocks occur as two types. The oldest type resembles N-MORB, whereas the youngest is characterized by moderate LREE enrichment and within-plate trace element characteristics. Taken together, the geochemistry of the mafic rocks suggests they were emplaced in an intra-oceanic back-arc basin to within-plate setting. Early Paleozoic (Ordovician to Early Devonian) mafic rocks are alkaline, enriched in LREE and Nb relative to HREE and were probably derived from a garnet lherzolite mantle source. Late Paleozoic mafic magmatism occurred during the extensional collapse phase of the Variscan orogen, in the aftermath of the collision between Gondwana and Laurussia. The basalts are within-plate, and transitional between alkaline and tholeiitic compositions but show a relative depletion of Nb. Cenozoic volcanic rocks in the Teplá-Barrandian zone are local representatives of regionally extensive Late Cretaceous to Cenozoic Central European Volcanic Province. The rocks are within-plate, alkaline basalts enriched in LREE and Nb and were derived from garnet lherzolite mantle. These data suggest significant input from upwelling asthenospheric mantle, implying that part of the Permian CLM mantle was re-fertilized by a juvenile post-Variscan CLM.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Lithos

ISSN

0024-4937

e-ISSN

—

Svazek periodika

326/327

Číslo periodika v rámci svazku

February 2019

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

358-369

Kód UT WoS článku

000458942700022

EID výsledku v databázi Scopus

2-s2.0-85059682678