Geodynamic evolution of the mauritanide,bassaride, and rokelide orogens (West Africa) |
| |
| Institution: | 1. Department of Soil Science, Stellenbosch University, P/Bag X1, Matieland, 7602, South Africa;2. CT Scanner Facility, Central Analytical Facilities, Stellenbosch University, P/Bag X1, Matieland, 7602, South Africa;3. School of Geosciences, University of the Witwatersrand, P/Bag 3, Wits, 2050, South Africa;1. School of Earth, Atmosphere and Environment, Monash University, Clayton, Vic 3800, Australia;2. Centre for Lithospheric Research, Czech Geological Survey, Klárov 3, Prague 1 11821, Czech Republic |
| |
| Abstract: | The Mauritanide, Bassaride and Rokelide orogens occur along the western edge of the West African Craton. These record a polyphase tectonothermal evolution, including Pan African I (c. 650 Ma) and Pan African II (c. 550 Ma) events together with local Hercynian (late Paleozoic) overprinting. Pan African I activity is most penetratively recorded in the Bassarides, and resulted from late Proterozoic collision of a western continental structural block. Pan African II orogenesis increases in intensity from the southern Mauritanides through the Bassarides and dominates the Rokelides. This tectonothermal activity appears to reflect collision of the West African and Guyanean Cratons during assembly of Gondwana. Hercynian activity is concentrated along the margin of a western continental block which underwent relative eastward translation during collision of Gondwana and Laurentia. This resulted in extensive thrusting of intracontinental foreland sequences (external nappes) and more ductile imbrications of pre-deformed and metamorphosed late Proterozoic rift sequences and western calc-alkaline igneous successions (internal nappes). |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
