The Variscides in the NW Corner of Africa

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169402" target="_blank" >RIV/00025798:_____/24:10169402 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/978-3-031-48299-1_6" target="_blank" >https://doi.org/10.1007/978-3-031-48299-1_6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-031-48299-1_6" target="_blank" >10.1007/978-3-031-48299-1_6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Variscides in the NW Corner of Africa

Popis výsledku v původním jazyce

This chapter is dedicated to the Variscan belt segment that is outcropping in NW Africa, covering Morocco, NW Algeria and NW of Mauritania. The NW Africa Variscan belt is considered an intraplate orogen, whose emplacement is largely due to the oceanic closure between Gondwana and Laurentia mainly from Carboniferous to Permian. This chapter re-examines the knowledge we have of this segment of the Variscan belt, reviewing the story over the time period spanning Devonian to Cisuralian and considering the up-to-date pending questions. A tectono-stratigraphical summary of the different domains of the belt is given and detailed for this time period. The &quot;intraplate&quot; character of the belt has been well-evidenced in northern Morocco and NW Algeria. Separated by the South (or Sub-) Meseta Zone, the Meseta and the Anti-Atlas and associated Carboniferous basins compose this northern part of the belt which shows a nice intraplate appendix to the southeast, in the Ougarta belt. Toward the southwest, the NW Africa Variscan belt shows a major extension in the Souttoufides belt, that fringes Gondwana from Western Anti-Atlas to the Morocco-Mauritania boundary along what is now the Atlantic coast. There, the opposite vergences of the Souttoufides, on one hand, and the Appalachian-Alleghanian belt, on the other hand, suggest a more classical double-verging orogen, where researchers are still looking for the past oceanic suture, probably lost in the Central Atlantic opening. The intraplate characteristics of northern Morocco/NW Algeria are now undisputed but the timing of Variscan deformation remains to be firmly established, regarding the initiation of the Variscan compression there. In this sense, we question the meaning of the precocious Eovariscan tectonic phase in NW Africa (Late Devonian(?)-Tournaisian/Early Visean) and propose a working alternative by considering this phase to represent a pre-orogenic stage, mainly extensional. As for the Souttoufides belt, knowledge is still poor about its Late Paleozoic story and its proper integration into the general Late Paleozoic framework. A state of the art is presented, that will likely be refined with the important geochronological and petrographical research that has been undertaken and that keeps going on for more than a decade. We try as much as we can to offer a modern view of the NW Africa Variscan belt by emphasizing the scientific questions that still await answers.

Název v anglickém jazyce

The Variscides in the NW Corner of Africa

Popis výsledku anglicky

This chapter is dedicated to the Variscan belt segment that is outcropping in NW Africa, covering Morocco, NW Algeria and NW of Mauritania. The NW Africa Variscan belt is considered an intraplate orogen, whose emplacement is largely due to the oceanic closure between Gondwana and Laurentia mainly from Carboniferous to Permian. This chapter re-examines the knowledge we have of this segment of the Variscan belt, reviewing the story over the time period spanning Devonian to Cisuralian and considering the up-to-date pending questions. A tectono-stratigraphical summary of the different domains of the belt is given and detailed for this time period. The &quot;intraplate&quot; character of the belt has been well-evidenced in northern Morocco and NW Algeria. Separated by the South (or Sub-) Meseta Zone, the Meseta and the Anti-Atlas and associated Carboniferous basins compose this northern part of the belt which shows a nice intraplate appendix to the southeast, in the Ougarta belt. Toward the southwest, the NW Africa Variscan belt shows a major extension in the Souttoufides belt, that fringes Gondwana from Western Anti-Atlas to the Morocco-Mauritania boundary along what is now the Atlantic coast. There, the opposite vergences of the Souttoufides, on one hand, and the Appalachian-Alleghanian belt, on the other hand, suggest a more classical double-verging orogen, where researchers are still looking for the past oceanic suture, probably lost in the Central Atlantic opening. The intraplate characteristics of northern Morocco/NW Algeria are now undisputed but the timing of Variscan deformation remains to be firmly established, regarding the initiation of the Variscan compression there. In this sense, we question the meaning of the precocious Eovariscan tectonic phase in NW Africa (Late Devonian(?)-Tournaisian/Early Visean) and propose a working alternative by considering this phase to represent a pre-orogenic stage, mainly extensional. As for the Souttoufides belt, knowledge is still poor about its Late Paleozoic story and its proper integration into the general Late Paleozoic framework. A state of the art is presented, that will likely be refined with the important geochronological and petrographical research that has been undertaken and that keeps going on for more than a decade. We try as much as we can to offer a modern view of the NW Africa Variscan belt by emphasizing the scientific questions that still await answers.

Druh

C - Kapitola v odborné knize

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název knihy nebo sborníku

The Geology of North Africa

ISBN

978-3-031-48298-4

Počet stran výsledku

41

Strana od-do

145-185

Počet stran knihy

660

Název nakladatele

Springer

Místo vydání

Switzerland

Kód UT WoS kapitoly

—