Age, tectonic evolution and origin of the Aswa Shear Zone in Uganda: Activation of an oblique ramp during convergence in the East African Orogen
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- 作者：K. Saalmanna ; kerstin.saalmann@ngu.no" class="auth_mail" title="E-mail the corresponding author ; kerstin.saalmann.geo@gmail.com" class="auth_mail" title="E-mail the corresponding author ; I. Mä ; nttä ; rib ; C. Nyakechoc ; E. Isabiryec
- 关键词：Aswa shear zone ; Structural evolution ; Kinematic indicators ; Uganda ; Pan-African ; U&ndash ; Pb zircon age
- 刊名：Journal of African Earth Sciences
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：117
- 期：Complete
- 页码：303-330
- 全文大小：13670 K
文摘
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A detailed analysis of strain, kinematics and age of the shear zone is presented.
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Shear strain is heterogeneous and partitioned into low and high strain zones.
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The age of main sinistral ductile shear activity is constrained to ca. 685-655 Ma.
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During E–W convergence the NE-dipping ASZ was activated as an oblique ramp.
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The ongoing Pan-African orogeny caused episodic reactivation at retrograde conditions.