The geology, geochemistry, and geochronology of proterozoic gneisses in the Lüderitz area, southern Namibia: insights into the evolution of the NW Namaqua Metamorphic Province
| dc.contributor.author | Shifotoka, Gerhard Mekondjo Naatangwe | |
| dc.date.accessioned | 2025-09-17T12:56:41Z | |
| dc.date.available | 2025-09-17T12:56:41Z | |
| dc.date.issued | 2025 | |
| dc.description.abstract | The basement rocks of the Lüderitz area, SW Namibia are dominated by migmatitic metavolcanic and intrusive gneisses that resemble those of the Paleoproterozoic Richtersveld Magmatic Arc (~1890 Ma; RMA; of the Namaqua Natal Metamorphic Province (NNMP)). Detailed geological mapping, geochemistry, isotopic and geochronological analysis was undertaken to establish a new, modern lithostratigraphy for the area and to determine whether the Lüderitz gneisses indeed form part of the RMA. The mafic, andesitic and dacitic metavolcanic gneisses (1876 ± 9 Ma) are grouped in the Albatrosskop Formation and occur as rafts within the coeval orthogneisses (1918-1855 Ma). Six main types of orthogneiss were mapped, namely: the Kolmanskop Migmatite, Adventure Bay metagabbro-metadiorite, the Radford Bay, Kowisberg and Albatross Bay granodiorite-granite gneisses and the Elizabeth Point leucogranite gneiss. The volcanic and plutonic rocks are overlain by the Dagger Rocks Group that yielded a youngest detrital grain age of 1731 ± 46 Ma. The supracrustal and plutonic rocks were strongly deformed and metamorphosed during the polyphase Mesoproterozoic Namaqua Orogeny. | |
| dc.identifier.uri | https://hdl.handle.net/10566/20938 | |
| dc.language.iso | en | |
| dc.publisher | University of the Western Cape | |
| dc.subject | Proterozoic gneisses | |
| dc.subject | Namibia | |
| dc.subject | Geochemistry | |
| dc.subject | Geochronology | |
| dc.subject | Geology | |
| dc.title | The geology, geochemistry, and geochronology of proterozoic gneisses in the Lüderitz area, southern Namibia: insights into the evolution of the NW Namaqua Metamorphic Province | |
| dc.type | Thesis |