{"title":"Bilan géochronologique de la République Populaire du Congo","authors":"Pierre Gioan, Jean-Paul Vicat","doi":"10.1016/0899-5362(87)90062-5","DOIUrl":null,"url":null,"abstract":"<div><p>Comprehensive measures of radiometric age have been made on proterozoic rock samples belonging to various structural units in the People's Republic of the Congo (Mayumbian belt, Niari synclinorium, Sembé-Ouesso sequences). Having gathered them in tables, we have been able to date certain major tectonic events. The calc-alkalic magmatism associated with the Mayumbian belt (1400 Ma) is linked to the oceanic closure (Kibarian orogenesis) and the ultimate metamorphic episode is dated at 600 Ma (Pan-African). The Niari synclinorium sedimentary sequences, which were deposited from 1000 Ma on, have undergone Pan-African metamorphism. Moreover, we notice a systematic rejuvenation attributed to the South Atlantic proto ocean opening. At last, the Sembe-Ouesso sequences have been subjected to an epimetamorphic episode around 630 Ma, probably also linked to the Pan-African orogenesis.</p></div>","PeriodicalId":100749,"journal":{"name":"Journal of African Earth Sciences (1983)","volume":"6 2","pages":"Pages 215-220"},"PeriodicalIF":0.0000,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(87)90062-5","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (1983)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536287900625","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
Comprehensive measures of radiometric age have been made on proterozoic rock samples belonging to various structural units in the People's Republic of the Congo (Mayumbian belt, Niari synclinorium, Sembé-Ouesso sequences). Having gathered them in tables, we have been able to date certain major tectonic events. The calc-alkalic magmatism associated with the Mayumbian belt (1400 Ma) is linked to the oceanic closure (Kibarian orogenesis) and the ultimate metamorphic episode is dated at 600 Ma (Pan-African). The Niari synclinorium sedimentary sequences, which were deposited from 1000 Ma on, have undergone Pan-African metamorphism. Moreover, we notice a systematic rejuvenation attributed to the South Atlantic proto ocean opening. At last, the Sembe-Ouesso sequences have been subjected to an epimetamorphic episode around 630 Ma, probably also linked to the Pan-African orogenesis.
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