{"title":"Les déformations eburnéennes de l'unité birrimienne de la comoé (côte d'ivoire)","authors":"M. Vidal","doi":"10.1016/0899-5362(87)90056-X","DOIUrl":null,"url":null,"abstract":"<div><p>The analysis of Eburnean strain fields in the Upper (?) Birrimian Comoé Unit shows four great stages of tectogenesis: </p><ul><li><span>&#x02022;</span><span><p>an early cleavage subparallel to stratification which results from synkinematic granitoïd intrusions;</p></span></li><li><span>&#x02022;</span><span><p>a folding (N40°E to N60°E);</p></span></li><li><span>&#x02022;</span><span><p>a transcurrent faulting period, essentially ductile N-S sinistral;</p></span></li><li><span>&#x02022;</span><span><p>N120°E schistosity, and a N110°E transcurrent ductile sinistral (?) faulting phase.</p></span></li></ul><p>The importance of the sinistral N-S faulting system and, to a lesser extent, the N120°E schistosity direction, is shown. The probable rôle of these directions (particularly N-S) from Liberian to Upper Cretaceous is shown by the within-plate tectonic occurrences in the West-African craton.</p></div>","PeriodicalId":100749,"journal":{"name":"Journal of African Earth Sciences (1983)","volume":"6 2","pages":"Pages 141-152"},"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)90056-X","citationCount":"20","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (1983)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/089953628790056X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 20
Abstract
The analysis of Eburnean strain fields in the Upper (?) Birrimian Comoé Unit shows four great stages of tectogenesis:
•
an early cleavage subparallel to stratification which results from synkinematic granitoïd intrusions;
•
a folding (N40°E to N60°E);
•
a transcurrent faulting period, essentially ductile N-S sinistral;
•
N120°E schistosity, and a N110°E transcurrent ductile sinistral (?) faulting phase.
The importance of the sinistral N-S faulting system and, to a lesser extent, the N120°E schistosity direction, is shown. The probable rôle of these directions (particularly N-S) from Liberian to Upper Cretaceous is shown by the within-plate tectonic occurrences in the West-African craton.
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