Evolution of a Cambro-Ordovician active margin in northern Gondwana: Geochemical and zircon geochronological evidence from the Góry Sowie metasedimentary rocks, Poland

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000104" target="_blank" >RIV/00025798:_____/21:00000104 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.gr.2020.10.011" target="_blank" >https://doi.org/10.1016/j.gr.2020.10.011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2020.10.011" target="_blank" >10.1016/j.gr.2020.10.011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evolution of a Cambro-Ordovician active margin in northern Gondwana: Geochemical and zircon geochronological evidence from the Góry Sowie metasedimentary rocks, Poland

Popis výsledku v původním jazyce

The Góry Sowie Massif (GSM) in Poland represents a Devonian HP‒UHP terrane dominated by paragneiss, with subordinate orthogneiss, metabasite and granulite. Whole-rock geochemistry of four migmatitic paragneiss and five granulite samples from the northern part of the GSM was combined with U‒Pb‒Lu‒Hf isotopic data on zircon in order to constrain the sedimentary provenance, tectonic setting and paleogeographic location of the sedimentary paleo-basins now forming the GSM. Granulite and paragneiss protoliths are geochemically analogous to flysch-like graywacke and point either to a continental arc or an active continental margin setting dominated by Cambrian felsic arc detritus. Detrital zircon age spectra record abundant Ediacaran to Cambrian population (493‒545 Ma) and few Palaeoproterozoic to Neoarchean clusters (1830‒2280 Ma and 2400‒2700 Ma), reflecting a peri-Gondwana provenance in vicinity of the Trans-Saharan belt and place firm constraints on the maximum depositional age of c. 6‒517 Ma for the paragneiss and of c. 493‒2 Ma for the granulite, respectively. The zircon overgrowth rims give two age clusters, one c. 400 Ma that possibly record a HP/HT metamorphic event, and the other c. 385 Ma that probably record time of migmatization during exhumation. This tectono-thermal event is coeval with emplacement of the Devonian ophiolitic rocks surrounding the GSM. The GSM rock association, degree and timing of metamorphism and coeval ophiolite emplacement resemble closely the Galicia-Trás-os-Montes middle and upper allochthonous units in the NW Iberia and the Münchberg Massif in Germany. Therefore, we suggest that all these massifs were not too distant before Devonian and could form part of the same tectonically dismembered terrane or archipelago located along the northern periphery of the Gondwana margin during Cambro‒Ordovician.

Název v anglickém jazyce

Evolution of a Cambro-Ordovician active margin in northern Gondwana: Geochemical and zircon geochronological evidence from the Góry Sowie metasedimentary rocks, Poland

Popis výsledku anglicky

The Góry Sowie Massif (GSM) in Poland represents a Devonian HP‒UHP terrane dominated by paragneiss, with subordinate orthogneiss, metabasite and granulite. Whole-rock geochemistry of four migmatitic paragneiss and five granulite samples from the northern part of the GSM was combined with U‒Pb‒Lu‒Hf isotopic data on zircon in order to constrain the sedimentary provenance, tectonic setting and paleogeographic location of the sedimentary paleo-basins now forming the GSM. Granulite and paragneiss protoliths are geochemically analogous to flysch-like graywacke and point either to a continental arc or an active continental margin setting dominated by Cambrian felsic arc detritus. Detrital zircon age spectra record abundant Ediacaran to Cambrian population (493‒545 Ma) and few Palaeoproterozoic to Neoarchean clusters (1830‒2280 Ma and 2400‒2700 Ma), reflecting a peri-Gondwana provenance in vicinity of the Trans-Saharan belt and place firm constraints on the maximum depositional age of c. 6‒517 Ma for the paragneiss and of c. 493‒2 Ma for the granulite, respectively. The zircon overgrowth rims give two age clusters, one c. 400 Ma that possibly record a HP/HT metamorphic event, and the other c. 385 Ma that probably record time of migmatization during exhumation. This tectono-thermal event is coeval with emplacement of the Devonian ophiolitic rocks surrounding the GSM. The GSM rock association, degree and timing of metamorphism and coeval ophiolite emplacement resemble closely the Galicia-Trás-os-Montes middle and upper allochthonous units in the NW Iberia and the Münchberg Massif in Germany. Therefore, we suggest that all these massifs were not too distant before Devonian and could form part of the same tectonically dismembered terrane or archipelago located along the northern periphery of the Gondwana margin during Cambro‒Ordovician.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA19-25035S" target="_blank" >GA19-25035S: Granulito–migmatitové dómy - náhled do devonského a karbonského vývoje Variského orogenního pásma</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Gondwana research

ISSN

1342-937X

e-ISSN

—

Svazek periodika

90

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

26

Strana od-do

1-26

Kód UT WoS článku

000617131800001

EID výsledku v databázi Scopus

2-s2.0-85096238984