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| Nubian Sandstone | |
|---|---|
| Name | Nubian Sandstone |
| Type | Geological formation |
| Period | Paleozoic–Mesozoic (primarily) |
| Lithology | Sandstone, conglomerate, siltstone, shale |
| Region | Northeast Africa, Arabian Peninsula |
| Country | Egypt; Sudan; Libya; Chad; Eritrea; Ethiopia; Saudi Arabia; Jordan; Israel |
Nubian Sandstone is a widespread sedimentary rock unit of chiefly sandstone that forms a major aquifer and stratigraphic package across northeast Africa and the Arabian Peninsula. The formation has been studied by geologists from institutions such as the British Geological Survey, United States Geological Survey, and universities including Cairo University, University of Khartoum, and King Saud University, and it plays roles in projects involving the Aswan High Dam, Great Man-Made River, and regional water management. Work on the unit intersects research fields represented by organizations like the International Association of Hydrogeologists, UNESCO, and the World Bank.
The stratigraphic framework of the unit is defined through correlations with regional sequences studied in publications from the Geological Society of London, the American Association of Petroleum Geologists, and national surveys of Egypt, Sudan, and Saudi Arabia. Researchers correlate the sandstone with named members and formations such as the Dawi Formation, Kiseiba Formation, and local equivalents recognized by the Egyptian Geological Survey and the Sudanese Geological Research Authority. Stratigraphic work employs boreholes drilled for projects linked to the Suez Canal region, the Red Sea Rift, and sedimentary basins near Port Sudan. Regional correlation uses chronostratigraphic markers tied to global events recorded by teams at institutions like Columbia University and University of Oxford.
Depositional interpretations draw on comparisons with depositional models developed by researchers affiliated with Imperial College London, Massachusetts Institute of Technology, and the Max Planck Institute for Chemistry. Sediments accumulated in fluvial, deltaic, aeolian, and shallow marine settings influenced by rift-related subsidence associated with the opening of the Red Sea and sediment supply from the Sahara Desert region. Age assignments range from the Late Paleozoic Ice Age-related intervals through the Mesozoic, constrained by biostratigraphic ties to fossil assemblages studied at the Natural History Museum, London and radiometric calibration from researchers at Stanford University. Correlations have been proposed with basins explored by companies such as BP, Chevron, and Shell.
The rock package is dominated by well-sorted to moderately sorted sandstones, with interbeds of conglomerate, siltstone, shale, and evaporite minerals documented in cores archived by the Egyptian Petroleum Research Institute and the Jordanian Natural Resources Authority. Mineralogical studies conducted at laboratories like the Geological Survey of Canada and University of Leeds report quartz-dominated framework grains, feldspar, heavy minerals including zircon and tourmaline, and cement phases such as calcite, silica, and iron oxides identified by teams from ETH Zurich and University of Cambridge. Diagenetic features studied by researchers at University of Texas at Austin and Sorbonne University include authigenic kaolinite and illite, pore-lining dolomite, and calcrete horizons that affect porosity and permeability.
The unit extends across structural and sedimentary provinces including the Nubian Basin, the Kordofan-Sudd Basin area, the Nile Delta Basin, the Eastern Desert (Egypt), and onshore parts of the Gulf of Suez and Sirhan Basin. Basin architecture reflects influence from the East African Rift System, the Red Sea Rift, and intracratonic subsidence associated with faults mapped by teams at the US Geological Survey and the Egyptian Ministry of Petroleum. Structural interpretations have been integrated into regional tectonic syntheses prepared by the International Union of Geological Sciences and petroleum explorers such as ExxonMobil.
The sandstone constitutes major aquifers—often referenced in hydrogeologic studies by UNICEF, FAO, and national water ministries of Egypt and Sudan—that supply municipal, agricultural, and industrial water to cities including Cairo, Khartoum, and Jeddah. Groundwater investigations use methods and instrumentation supplied by companies like Schlumberger and techniques developed at Colorado School of Mines and University of California, Berkeley to evaluate transmissivity, storativity, and isotopic composition. Large-scale abstractions have been implemented in projects such as the Great Man-Made River and monitored in collaboration with agencies like the World Health Organization and UNEP because of concerns about saline intrusion, contaminant pathways, and sustainable yield.
Beyond groundwater, the sandstone acts as reservoir rock for hydrocarbons in basins explored by companies including TotalEnergies, Eni, and Saudi Aramco, with petroleum systems integrated into analyses by the Society of Petroleum Engineers. Construction-grade aggregates, dimension stone, and deposits of industrial minerals have been quarried under permits issued by ministries in Egypt, Jordan, and Sudan. Resource development intersects regional infrastructure projects like the Suez Canal Economic Zone and energy initiatives backed by institutions such as the African Development Bank.
Fossil finds within interbedded strata and correlative units have been documented by paleontologists affiliated with the Natural History Museum, London, American Museum of Natural History, and regional museums in Khartoum and Cairo. Faunal and floral assemblages include terrestrial plant debris, ichnofossils, and occasional vertebrate remains that inform correlations with broader paleobiogeographic patterns tied to events such as the Triassic–Jurassic extinction event and regional climatic shifts recorded alongside deposits studied by teams at University of Bonn and University of Vienna.
Category:Geologic formations of Africa Category:Geology of the Middle East