Ediacaran terrane accretion in the Arabian-Nubian Shield
MetadataShow full item record
The Ad Dawadimi Terrane is an Ediacaran basin of the Arabian Nubian Shield (ANS), Saudi Arabia. This basin terrane is situated in the far eastern part of the ANS and represents the youngest accretion event of the exposed ANS. Therefore, the timing of events within the basin is key to understanding both the closure of the Mozambique Ocean and the amalgamation of Gondwana along the northern East African Orogen. Here we present U/Pb detrital zircon data for the Abt Formation, the principle basin sediments of the Ad Dawadimi Terrane, along with 40Ar/39Ar ages on muscovite and whole rock Sm/Nd data. These data indicate that deepwater deposition in the Abt Basin did not end until after ca. 620 Ma and that deformation and greenschistfacies metamorphism of the Abt Formation occurred at 620±3 (2s) Ma along an active margin. This is the youngest terrane amalgamation event reported so far in the Arabian–Nubian Shield, but we suggest even younger sutures lie further east beneath the Phanerozoic cover of eastern Saudi Arabia. Our results suggest that the Ediacaran basins of the eastern ANS were not part of the Huqf basin in Oman, which was instead part of a passive margin of Neoproterozoic India, separated from the active margin of Africa by the Mozambique Ocean that probably did not close until the late Ediacaran or early Cambrian.
Showing items related by title, author, creator and subject.
Geochronology in the southern Midyan terrane: a review of constraints on the timing of magmatic pulses and tectonic evolution in a northwestern part of the Arabian ShieldKozdrój, W.; Kennedy, Allen; Johnson, P.; Ziólkowska-Kozdrój, M.; Kadi, K. (2017)© 2017 Taylor & Francis The southern Midyan terrane is a composite Tonian to Ediacaran tectonostratigraphic crustal block in the northern Arabian Shield that prior to Red Sea opening was contiguous with coeval rocks in ...
Stern, R.; Ali, K.; Abdelsalam, M.; Wilde, Simon; Zhou, Q. (2012)The Southern Ethiopian Shield (SES) in the central East African Orogen lies at the junction of Neoproterozoic (880–550 Ma) largely greenschist-facies juvenile crust of the Arabian-Nubian Shield in the north and more ...
Blades, M.; Collins, A.; Foden, J.; Payne, J.; Xu, X.; Alemu, T.; Woldetinsae, G.; Clark, Christopher; Taylor, R. (2015)The Western Ethiopian Shield (WES) forms a vast, underexplored, region of the East African Orogen. Lying towards the west of the orogen and between the dominantly juvenile Arabian-Nubian Shield in the north and the ...