Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000214" target="_blank" >RIV/00025798:_____/19:00000214 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/67985530:_____/20:00508957 RIV/67985831:_____/20:00508957
Výsledek na webu
<a href="https://jgs.lyellcollection.org/content/early/2019/10/21/jgs2019-037" target="_blank" >https://jgs.lyellcollection.org/content/early/2019/10/21/jgs2019-037</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1144/jgs2019-037" target="_blank" >10.1144/jgs2019-037</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif
Popis výsledku v původním jazyce
The Kouřim Unit represents one of the largest pre-Variscan metaigneous complexes in the Bohemian Massif and a geochronological, whole-rock geochemical and Sr–Nd isotopic study was conducted in order to better understand the magmatic evolution of the Early Palaeozoic Gondwana margin. Five orthogneisses give U–Pb zircon ages ranging from 492 ± 4 Ma to 484 ± 2 Ma. Two leucogranites give U–Pb zircon ages of 500 ± 4 Ma and 485 ± 2 Ma, interpreted to be inherited from their orthogneiss host rock. Two samples from the metasedimentary host rock are dominated by Neoproterozoic–Cambrian detrital zircons. The abundance of zircon inheritance in the orthogneisses and whole-rock Sr–Nd isotopic composition imply an origin from relatively matured continental crustal material. The subalkaline, subaluminous–slightly peraluminous and high-K calc-alkaline arc-like geochemical signature of the orthogneisses is interpreted as inherited from the recycled Cadomian metasedimentary source and both the magmatic and metasedimentary rocks are correlated with similar occurrences in the adjacent Moldanubicum and Teplá–Barrandian Unit. The Late Cambrian–Early Ordovician magmatic activity is linked to crustal anatexis, which was likely initiated by thermal and gravitational relaxation of the thickened Cadomian arc-type crust, followed by lithospheric thinning assisted by far-field forces. The extensional event led to the formation of a passive margin associated with the opening of the Rheic Ocean.
Název v anglickém jazyce
Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif
Popis výsledku anglicky
The Kouřim Unit represents one of the largest pre-Variscan metaigneous complexes in the Bohemian Massif and a geochronological, whole-rock geochemical and Sr–Nd isotopic study was conducted in order to better understand the magmatic evolution of the Early Palaeozoic Gondwana margin. Five orthogneisses give U–Pb zircon ages ranging from 492 ± 4 Ma to 484 ± 2 Ma. Two leucogranites give U–Pb zircon ages of 500 ± 4 Ma and 485 ± 2 Ma, interpreted to be inherited from their orthogneiss host rock. Two samples from the metasedimentary host rock are dominated by Neoproterozoic–Cambrian detrital zircons. The abundance of zircon inheritance in the orthogneisses and whole-rock Sr–Nd isotopic composition imply an origin from relatively matured continental crustal material. The subalkaline, subaluminous–slightly peraluminous and high-K calc-alkaline arc-like geochemical signature of the orthogneisses is interpreted as inherited from the recycled Cadomian metasedimentary source and both the magmatic and metasedimentary rocks are correlated with similar occurrences in the adjacent Moldanubicum and Teplá–Barrandian Unit. The Late Cambrian–Early Ordovician magmatic activity is linked to crustal anatexis, which was likely initiated by thermal and gravitational relaxation of the thickened Cadomian arc-type crust, followed by lithospheric thinning assisted by far-field forces. The extensional event led to the formation of a passive margin associated with the opening of the Rheic Ocean.
Klasifikace
Druh
J<sub>SC</sub> - Článek v periodiku v databázi SCOPUS
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
Projekt
<a href="/cs/project/GA18-24378S" target="_blank" >GA18-24378S: Petrogeneze (ultra-)draselných magmat evropských Variscid – implikace pro vývoj kolizních orogenů a modely krustálního růstu</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of the Geological Society London
ISSN
0016-7649
e-ISSN
—
Svazek periodika
177
Číslo periodika v rámci svazku
2
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
17
Strana od-do
325-341
Kód UT WoS článku
—
EID výsledku v databázi Scopus
2-s2.0-85081136852