comoe (cote d'ivoire)的birrimian单位的eburan变形

Journal of African Earth Sciences (1983) Pub Date : 1987-01-01 DOI:10.1016/0899-5362(87)90056-X

M. Vidal

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引用次数: 20

摘要

上(?)段Eburnean应变场分析Birrimian como单元表现出4个大阶段的构造作用:•由同动granitoïd侵入引起的近平行于分层的早期解理;•一个褶皱期(N40°E至N60°E);•一个横向断裂期，主要是韧性的N-S左旋;•N120°E的片理;和一个N110°E的横向韧性左旋(?)断裂期。显示了北-南向左断裂系统的重要性，并在较小程度上显示了北120°E片理方向的重要性。从利比里亚到上白垩纪，这些方向(特别是南北向)的可能rôle由西非克拉通的板块内构造事件显示。

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Les déformations eburnéennes de l'unité birrimienne de la comoé (côte d'ivoire)

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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来源期刊

Journal of African Earth Sciences (1983)

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