Tracing southern Gondwanan sedimentary paths: A case study of northern Namibian late Palaeozoic sedimentary rocks
نویسندگان
چکیده
The northern Namibian Karoo-aged successions are part of a Gondwana-wide sedimentary system emerging at the Carboniferous–Permian boundary and existing for more than 50 Ma. Karoo Supergroup importance in understanding evolution rift system. This study presents new whole-rock geochemical data combined with detrital zircon morphology as well U−Pb ages Lu−Hf composition late Palaeozoic siliciclastic rocks Huab Basin Kunene area (south-west Africa). Inferred by youngest Verbrande Berg Formation (lower Ecca Group) yields Sakmarian to Asselian maximum depositional age, whereas overlying Tsarabis an Artinskian age. These coincide end Dwyka ice age overall warming contemporaneous I across southern Gondwana. distribution investigated samples clusters ranging between ca 500 650 Ma (Cambrian–late Neoproterozoic), 950 1200 (early Neoproterozoic–Mesoproterozoic) 1800 1900 (Palaeoproterozoic). Their rounded shapes characterize grains lower section, upper strata yield mostly unrounded grains. nature diverse spectrum putatively points towards sediment homogenization multiple recycling stages during deposition sediments large catchment areas depositing rivers. As suggested low roundness value single Palaeoproterozoic cluster, were probably deposited under drier climatic conditions, small limited homogenization. Therefore, Gondwana transport may change over time is dependent on climate prevailing deposition. shows that laws very complex yet be explored.
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ژورنال
عنوان ژورنال: Sedimentology
سال: 2022
ISSN: ['1365-3091', '0037-0746']
DOI: https://doi.org/10.1111/sed.12971