U-Pb geochronology of Variscan granitoids from the Moroccan Meseta (Northwest Africa): Tectonic implications

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168714" target="_blank" >RIV/00025798:_____/23:10168714 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.gr.2023.02.004" target="_blank" >https://doi.org/10.1016/j.gr.2023.02.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2023.02.004" target="_blank" >10.1016/j.gr.2023.02.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

U-Pb geochronology of Variscan granitoids from the Moroccan Meseta (Northwest Africa): Tectonic implications

Popis výsledku v původním jazyce

This paper present new U-Pb geochronological data (LA-ICP MS on zircon) of granitoids from the Moroccan Meseta Variscan belt. Zircons from the Oulad Ouaslam granodiorite in the Jebilet massif in the Western Meseta highlight a peak of magmatic activity at 335.2 +/- 0.8 Ma. In the Eastern Meseta, the ages obtained from several granitoids facies from the High Moulouya magmatic complex restrained its magmatic activity to the early Visean: 339.6 +/- 1.9 Ma for the Perdreaux granite, 337 +/- 1.6 Ma for the calc-alkaline &apos;grey &gt;&gt; granite and 343.1 +/- 1.2 Ma for the El Hassir granodiorite. Similar late Tournaisian - early Visean ages were obtained for the Zekarra granodiorite (348.1 +/- 2.3 Ma) and the Merguechoum granite (345.2 +/- 2.8 Ma) in the Horsts belt. This pre-orogenic Eovariscan magmatic activity is contempo-raneous with the opening of early Carboniferous intracontinental basins in the whole Northwest Africa but its relationship with Eovariscan deformation typifying the Eastern Meseta remains temporally unclear. Then, the late Carboniferous ages of 308.2 +/- 2.7 Ma obtained for the Beni Snassen monzogranite, 303.5 +/- 1.7 for the Tanncherfi granodiorite and 305.2 +/- 1.4 for the Boudoufoud granite in the Horsts belt show that they all are synchronous with the main late Carboniferous convergent Variscan event in Northwest Africa. This tectonic and magmatic tempos contrast with the one described in the European Variscan belt, where the syn-collisional magmatism forms coevally with the Northwest African Eovariscan event, re-interpreted as a possible extensional event. We proposed that the early Carboniferous intracontinental basins and magmatism in Northwest Africa are due to the propagation of the Paleotethys ocean within the Gondwana continent. In contrary, the late Carboniferous - early Permian tectono-magmatic activity could reflect the docking of the east Gondwana margin with the Iberian branch of the European Variscan belt.(c) 2023 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Název v anglickém jazyce

U-Pb geochronology of Variscan granitoids from the Moroccan Meseta (Northwest Africa): Tectonic implications

Popis výsledku anglicky

This paper present new U-Pb geochronological data (LA-ICP MS on zircon) of granitoids from the Moroccan Meseta Variscan belt. Zircons from the Oulad Ouaslam granodiorite in the Jebilet massif in the Western Meseta highlight a peak of magmatic activity at 335.2 +/- 0.8 Ma. In the Eastern Meseta, the ages obtained from several granitoids facies from the High Moulouya magmatic complex restrained its magmatic activity to the early Visean: 339.6 +/- 1.9 Ma for the Perdreaux granite, 337 +/- 1.6 Ma for the calc-alkaline &apos;grey &gt;&gt; granite and 343.1 +/- 1.2 Ma for the El Hassir granodiorite. Similar late Tournaisian - early Visean ages were obtained for the Zekarra granodiorite (348.1 +/- 2.3 Ma) and the Merguechoum granite (345.2 +/- 2.8 Ma) in the Horsts belt. This pre-orogenic Eovariscan magmatic activity is contempo-raneous with the opening of early Carboniferous intracontinental basins in the whole Northwest Africa but its relationship with Eovariscan deformation typifying the Eastern Meseta remains temporally unclear. Then, the late Carboniferous ages of 308.2 +/- 2.7 Ma obtained for the Beni Snassen monzogranite, 303.5 +/- 1.7 for the Tanncherfi granodiorite and 305.2 +/- 1.4 for the Boudoufoud granite in the Horsts belt show that they all are synchronous with the main late Carboniferous convergent Variscan event in Northwest Africa. This tectonic and magmatic tempos contrast with the one described in the European Variscan belt, where the syn-collisional magmatism forms coevally with the Northwest African Eovariscan event, re-interpreted as a possible extensional event. We proposed that the early Carboniferous intracontinental basins and magmatism in Northwest Africa are due to the propagation of the Paleotethys ocean within the Gondwana continent. In contrary, the late Carboniferous - early Permian tectono-magmatic activity could reflect the docking of the east Gondwana margin with the Iberian branch of the European Variscan belt.(c) 2023 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

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

2023

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

1878-0571

Svazek periodika

117

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

21

Strana od-do

274-294

Kód UT WoS článku

000948550500001

EID výsledku v databázi Scopus

2-s2.0-85148352792