Aswa Dislocation
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The Aswa Dislocation, also called the Aswa mylonite belt, Aswa Lineament or Aswa Shear Zone, is a north-west trending ductile shear zone that runs to the east of Lake Victoria in East Africa.[1]
Extent
The lineament dates to the Precambrian era and thus is much older than the East African Rift System. It probably extends northwest to Darfur in Sudan, perhaps along the Abu Gabra Rift, and perhaps southeast to the Lindi fault zone on the Indian Ocean coast, passing through the Kilimanjaro and Elgon volcanic centers.[2]
Connection to the East African rift system
The fault seems to have been partly reactivated during the Neogene in the section between the Albertine and Gregory rifts, and along its southern extension towards the Indian Ocean.[3] The reactivated section of the Aswa lineament connects the eastern and western branches of the East African rift system.[4] It seems also to truncate the Nyanza rift, which extends ENE from Lake Victoria.[1] The section of the Aswa Dislocation between the two rifts forms part of the boundary between the Somali Plate and the African Plate.[5]
References
- ^ a b Rach 1992, p. 221.
- ^ Rosendahl 1987, p. 461.
- ^ Chorowicz, Le Fournier & Vidal 1987, p. 495.
- ^ Volon et al. 1998.
- ^ Rosendahl 1987, p. 450.
- Sources
- Volon, C.; Kervyn, F.; Slob, S.; Derauw, D. (21 September 1998). "Combination of spaceborne radar interferometry (DEM) and Landsat TM imageries contributing to recent tectonic and geology studies in the Aswa lineament shear zone (Sudan)". The International Society for Optical Engineering. Retrieved 2012-04-04.
- Chorowicz, Jean; Le Fournier, Jacques; Vidal, Gerard (Winter 1987). "A model for rift development in Eastern Africa". Geological Journal. 22 (Supplement S2): 495–513. doi:10.1002/gj.3350220630.
- Rach, Nina M. (1992). "Tectonic Controls on the Lake Victoria Basin". Basement tectonics 7: proceedings of the Seventh International Conference on Basement Tectonics, held in Kingston, Ontario, Canada, August 1987. Springer. ISBN 978-0792315827.
- Rosendahl, B. R. (1987). "Architecture of Continental Rifts with Special Reference to East Africa". Annual Review of Earth and Planetary Sciences. 15: 445–503. Bibcode:1987AREPS..15..445R. doi:10.1146/annurev.ea.15.050187.002305.
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- Major plates: African Plate
- Minor plates: Somali Plate
- Microplates: Lwandle Plate
- Madagascar Plate
- Rovuma Plate
- Seychelles Plate
- Victoria Microplate
- Aswa Dislocation
- Broodkop Shear Zone
- Central African Shear Zone
- Chuan Shear Zones
- Foumban Shear Zone
- Kandi Fault Zone
- Mwembeshi Shear Zone
- Todi Shear Zone
- Western Meseta Shear Zone
- Afar Triangle
- Anza trough
- Bahr el Arab rift
- Benue Trough
- Blue Nile rift
- East African Rift
- Gulf of Suez Rift
- Lamu Embayment
- Melut Basin
- Muglad Basin
- Red Sea Rift
- Sangha Aulacogen
- Atbara rift
- Urema Valley
- West and Central African Rift System
- White Nile rift
- Angola Basin
- Aoukar
- Blue Nile Basin
- Chad Basin
- Congo Basin
- Douala Basin
- El Djouf
- Karoo Basin
- Gabon Basin
- Iullemmeden Basin
- Kufra Basin
- Murzuq Basin
- Niger Delta Basin
- Ogaden Basin
- Orange River Basin
- Ouled Abdoun Basin
- Owambo Basin
- Reggane Basin
- Rio del Rey Basin
- Sirte Basin
- Somali Coastal Basin
- Taoudeni Basin
- Tanzania Coastal Basin
- Tindouf Basin
- Turkana Basin
- Aïr Mountains
- Atlas Mountains
- Aurès Mountains
- Bambouk Mountains
- Blue Mountains
- Cameroon line
- Central Pangean Mountains
- Chaillu Mountains
- Drakensberg
- Eastern Arc Mountains
- Eastern Rift mountains
- Ethiopian Highlands
- Great Escarpment
- Great Karas Mountains
- Guinea Highlands
- Hoggar Mountains
- Imatong Mountains
- Jebel Uweinat
- Loma Mountains
- Mandara Mountains
- Marrah Mountains
- Mitumba Mountains
- Nuba Mountains
- Rif Mountains
- Rwenzori Mountains
- Sankwala Mountains
- Serra da Leba
- Serra da Chela
- Teffedest Mountains
- Tibesti Mountains
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