Age, tectonic evolution and origin of the Aswa Shear Zone in Uganda: Activation of an oblique ramp during convergence in the East African Orogen
作者: K. SaalmannI. MänttäriC. NyakechoE. Isabirye
作者单位: 1Geological Survey of Norway, Leiv Eirikssons vei 39, 7491 Trondheim, Norway
2Geological Survey of Finland, P.O. Box 96, Espoo, Finland
3Department of Geological Survey and Mines, P.O. Box 9, Entebbe, Uganda
刊名: Journal of African Earth Sciences, 2016, Vol.117 , pp.303-330
来源数据库: Elsevier Journal
DOI: 10.1016/j.jafrearsci.2016.02.002
关键词: Aswa shear zoneStructural evolutionKinematic indicatorsUgandaPan-AfricanU–Pb zircon age
英文摘要: Abstract(#br)The Aswa Shear Zone (ASZ) is a major NW–SE trending structure of over 1000 km length in East Africa. In Uganda, the ASZ is a steeply NE-dipping, up to 11 km wide mylonitic shear zone that shows multiple stage brittle reactivation. On outcrop-scale, the fabric in the ASZ is characterized by a well-developed NW–SE striking and subvertical or steeply NE or SW dipping mylonitic foliation and a subhorizontal to moderately NW- or SE-plunging stretching lineation. Sinistral kinematics and fabric are very consistent along strike. The strain is heterogeneously distributed and partitioned into lens-shaped lower strain zones dominated by folding and characterized by pure shear, which are surrounded by high strain zones, some of them thick ultramylonites, with intense simple shear...
全文获取路径: Elsevier  (合作)
影响因子:1.229 (2012)

  • convergence 汇合
  • tectonic 构造的
  • oblique 间接的
  • evolution 进化
  • origin 起原
  • African 非洲的
  • Uganda 乌干达
  • during 在的期间