TY - JOUR
T1 - The Feiran-Solaf metamorphic complex, Sinai, Egypt
T2 - Evidence for orthogonal or oblique tectonic convergence?
AU - Fowler, A.
AU - Hassen, I. S.
AU - Hassan, M.
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/10
Y1 - 2018/10
N2 - New structural data collected along five transects across the trend of the Feiran-Solaf metamorphic complex (FSC) in the Sinai, provide a more precise depiction of the macroscopic folds. The two main macrofolds of the complex, the NW-SE trending Feiran and Solaf antiforms, appear to be thrust-related folds with detachments at different stratigraphic levels in the FSC. Contrary to earlier views, there is only one macrofolding event (D2) in the FSC, accompanied by NW-SE trending F2 mesofolds with varying style. While the F2 mesofolds are most commonly open concentric and symmetrical, some of these folds have been modified by inhomogeneous shear strain to become tight “similar” style asymmetric mesofolds in a zone of intense ductile shearing along the SW flank of the Feiran antiform. The recent Najd-related transpression model for FSC D2 deformation is evaluated. An alternative model for D2 as a product of orthogonal convergence is preferred. The D2 event recorded the collision of the FSC with the Sa'al terrane at ∼800 Ma. The Kid arc complex collided with the Feiran and Sa'al complexes during subsequent NNW-SSE convergence at about 620-600 Ma.
AB - New structural data collected along five transects across the trend of the Feiran-Solaf metamorphic complex (FSC) in the Sinai, provide a more precise depiction of the macroscopic folds. The two main macrofolds of the complex, the NW-SE trending Feiran and Solaf antiforms, appear to be thrust-related folds with detachments at different stratigraphic levels in the FSC. Contrary to earlier views, there is only one macrofolding event (D2) in the FSC, accompanied by NW-SE trending F2 mesofolds with varying style. While the F2 mesofolds are most commonly open concentric and symmetrical, some of these folds have been modified by inhomogeneous shear strain to become tight “similar” style asymmetric mesofolds in a zone of intense ductile shearing along the SW flank of the Feiran antiform. The recent Najd-related transpression model for FSC D2 deformation is evaluated. An alternative model for D2 as a product of orthogonal convergence is preferred. The D2 event recorded the collision of the FSC with the Sa'al terrane at ∼800 Ma. The Kid arc complex collided with the Feiran and Sa'al complexes during subsequent NNW-SSE convergence at about 620-600 Ma.
KW - Fault-bend fold
KW - Fault-propagation fold
KW - Gneissic complex
KW - Neoproterozoic
KW - Orthogonal convergence
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U2 - 10.1016/j.jafrearsci.2017.09.007
DO - 10.1016/j.jafrearsci.2017.09.007
M3 - Article
AN - SCOPUS:85029791897
SN - 1464-343X
VL - 146
SP - 48
EP - 65
JO - Journal of African Earth Sciences
JF - Journal of African Earth Sciences
ER -