Zusammenfassung
Das Basement Nigerias ist polyzyklisch aufgebaut mit Ereignissen, die bis zu 3000 m. y. zurückliegen. Wie in anderen Teilen Afrikas erfolgte die stÄrkste Deformation und Remomobilisation wÄhrend der Panafrikanischen Orogenese (vor etwa 650-450 m. y.).
Es wird eine übersicht über die Geologie dieses Gebietes gegeben, die jüngste GelÄndeaufnahmen und geochronologische Daten berücksichtigt. Auch wird gezeigt, da\ das Basement von der Kibarischen Orogenese vor 1300-900 m. y. erfa\t worden sein könnte.
ZusÄtzlich wird der Versuch unternommen, die Evolution der prÄkambrischen Gesteine Nigerias zu diskutieren mit dem Schlu\, da\ die meisten Gesteine sich eher aus ensialischen als aus plattentektonischen Prozessen entwickelten.
Abstract
The Basement complex of Nigeria is polycyclic and retains memories of events dating back to about 3000 m. y. As in other parts of Africa, it suffered its most pronounced deformation and remobilisation during the Pan African Orogeny (about 650-450 m. y. ago).
A review of the geology of this terrain is presented following recent field and geochronological data. It is also shown that the basement may have participated in the 1300-900 m. y. Kibaran Orogeny.
In addition, an attempt is made at discussing the evolution of the Precambrian rocks in Nigeria and the conclusion is made that most of the rocks evolved by ensialic rather than plate tectonic processes.
Résumé
Le complexe du soubassement nigérien est polycyclique, et porte la marque d'événements remontant à 3.000 millions d'années. Il a subi sa déformation et sa remobilisation les plus marquées, comme ce fut le cas dans le reste du continent Africain, au cours de l'orogénie Pan Africaine, c-a-d il y a entre 650-450 millions d'années.
Dans ce travail, nous présentons la géologie de ce terrain d'après des données cartographiques et géochronologiques récentes. Nous démontrons également que ce soubassement peut très bien avoir participé à l'orogénie kibarienne d'il y a 1.3000 à 900 millions d'années.
En outre, nous essayons de discuter l'évolution de roches précambriennes de la Nigérie, et nous en tirons la conclusion que pour la plupart des roches, cette évolution répond à une formation ensialique plutÔt qu'à des processus de tectonique de plaques.
кРАткОЕ сОДЕРжАНИЕ
ОБРАжОВАНИЕ ФУНДАМЕ НтА В НИгЕРИИ НАЧАлОс ь пРИМЕРНО 3000 МИллИОНОВ лЕт тОМУ НАжАД. кАк И В Д РУгИх ЧАстьх АФРИкИ, ж ДЕсь В пЕРИОД пАНАФРИ кАНскОгО ОРОгЕНЕжА (пРИМЕРНО 650-450 МИллИОНОВ лЕт тОМУ НА жАД) ИМЕлИ МЕстО сИльНАь ДЕФОРМ АцИь И пОВтОРьУЩАьсь МОБИлИжАцИь стРУктУР.
пРИВЕДЕНы гЕОхРОНОл ОгИЧЕскИЕ ДАННыЕ; пРИ ЁтОМ пОДЧЕРкИВАЕтсь, ЧтО кИБАРАНскИИ ОРОгЕНЕ ж пРОИсхОДИл 1300-900 МИллИО НОВ лЕт тОМУ НАжАД.
ДЕлАЕтсь пОпыткА ОпИ сАть ЁВОлУцИУ ДОкЕМБ РИИскИх ОтлОжЕНИИ НИгЕРИИ, пРИЧЕМ пРИхОДьт к ВыВ ОДУ, ЧтО БОлыпЕНстВО п ОРОД ОБРАжОВАлОсь НЕ ВВИД У ЁНсИАльНых пРОцЕссО В, А В РЕжУльтАтЕ тЕктО НИкИ плИт.
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Odeyemi, I. A review of the orogenic events in the Precambrian basement of Nigeria, West Africa. Geol Rundsch 70, 897–909 (1981). https://doi.org/10.1007/BF01820170
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DOI: https://doi.org/10.1007/BF01820170