Book Chapter
Definition of tectonostratigraphic terranes in the Mauritanide, Bassaride, and Rokelide orogens, West Africa
Author(s)
-
Published:January 01, 1989
The West African orogens (Mauritanides, Bassarides, Rokelides) record a locally complex, polyphase, tectonothermal evolution. The earliest event corresponded to westward rifting of a continental fragment from the West African craton at ca. 700 Ma. This led to development of a rift-facies lithotectonic succession that included sedimentary units and intracontinental igneous sequences. Rifting must have been of limited extent because a western ensialic arc began to develop as early as 680 Ma. The associated convergence culminated in an episode of folding and metamorphism at ca. 650 Ma (Pan-African I orogenesis) in the Mauritanides and Bassarides.
Following widespread deposition of Late Proterozoic...
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GSA Special Papers
Terranes in the Circum-Atlantic Paleozoic Orogens
Author(s)
Geological Society of America

Volume
230
Copyright:
© 1989 Geological Society of America
Geological Society of America
ISBN print:
9780813722306
Publication date:
January 01, 1989
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Index Terms/Descriptors
- accretion
- Africa
- basement
- Bouguer anomalies
- controls
- correlation
- crystalline rocks
- evolution
- faults
- folds
- Gondwana
- gravity anomalies
- Guiana Shield
- IGCP
- imbrication
- Laurentia
- lithofacies
- metamorphism
- nappes
- orogeny
- Pan-African Orogeny
- planar bedding structures
- plate collision
- polyphase processes
- Precambrian
- Proterozoic
- rifting
- sedimentary structures
- shear zones
- South America
- structural geology
- tectonics
- tectonostratigraphic units
- terranes
- thrust faults
- unconformities
- upper Precambrian
- Variscan Orogeny
- West Africa
- West African Shield
- Mauritanide Orogeny
- Bassaride Orogeny
- Rokelide Orogeny
Latitude & Longitude
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