The Neoproterozoic Keraf Suture in NE Sudan : Sinistral Transpression along the Eastern Margin of West Gondwana

  • Abdelsalam M
  • Stern R
  • Copeland P
 et al. 
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The Keraf Suture, formed during the Neoproterozoic consolidation of Gondwana, is a ~500 km long, ~50 km wide, N-trending suture between the Neoproterozoic Arabian-Nubian Shield in the east and the older Nile Craton to the west. The Keraf Suture is superimposed on E- and NE-trending structures on both sides. The northern part of the suture is dominated by N-trending, upright folds, whereas the southern part is characterized by N- and NNW-trending, sinistral, strike-slip faults. A major antiform defines a structural divide between the northern and southern parts of the suture. 40 Ar/39 Ar ages on biotite and hornblendes separated from a deformed granitic body indicate that the sinistral movement along the N- and NNW-trending faults took place at ~580 Ma. The difference in structural styles along strike is due to formation of the Keraf Suture by sinistral transpression, which accompanied early NW-SE oblique collision between East and West Gondwana at ~650–600 Ma and terminal collision at ~580 Ma.

Author-supplied keywords

  • Keraf Suture
  • NE Sudan
  • Neoproterozoic
  • Pan-African

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  • Mohamed G Abdelsalam

  • Robert J Stern

  • Peter Copeland

  • Elfadil M Elfaki

  • Bushra Elhur

  • Fathelrahman M Ibrahim

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