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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Zambia (1)
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East African Rift (2)
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Limpopo Basin (1)
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Southern Africa
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Botswana
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Okavango Delta (11)
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Namibia (1)
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Okavango Delta
Clay mineralogy in southern Africa river muds
Hydrogeophysical investigations in the western and north-central Okavango Delta (Botswana) based on helicopter and ground-based transient electromagnetic data and electrical resistance tomography
Constraining helicopter electromagnetic models of the Okavango Delta with seismic-refraction and seismic-reflection data
Paleo-megalake and paleo-megafan in southern Africa
Processing and inversion of commercial helicopter time-domain electromagnetic data for environmental assessments and geologic and hydrologic mapping
THE OKAVANGO DELTA AND ITS PLACE IN THE GEOMORPHOLOGICAL EVOLUTION OF SOUTHERN AFRICA
THE EVOLUTION AND AGES OF MAKGADIKGADI PALAEO-LAKES: CONSILIENT EVIDENCE FROM KALAHARI DRAINAGE EVOLUTION SOUTH-CENTRAL AFRICA
Aeromagnetic data reveal a possible 15–20 km wide impact structure in the Okavango Delta, Botswana. The identified structure is located at 19°07′40.0″S, 23°18′12.7″E, and it is marked by a circular region of subdued magnetic intensity ~18 km across with a central magnetic peak. It does not appear to be visible in either Google Earth imagery or Shuttle Radar Topography Mission (SRTM) topographic data, and gravity data are too sparse in this region to image the structure. The regional magnetic fabric continues through the anomaly. The central magnetic peak has an amplitude of >700 nT. Modeling of the magnetic data indicates that the structure might be buried beneath ~200–500 m of sediments, and it has a magnetically modeled central uplift that is ~5 km wide.