Paper No. 19
Presentation Time: 1:30 PM
CURIE POINT ISOTHERM ESTIMATES OF THE LUANGWA RIFT, ZAMBIA
Aeromagnetic data were used to determine the Curie point depth (CPD) by power density spectral and three-dimensional inversion methods within the Luangwa Rift and surrounding cratons and mobile belts. The Luangwa Rift is part of a pervasive network of Karoo rifts formed in southeastern Africa during the Upper Carboniferous – Lower Jurassic. This rift is suggested to be responsible for Gondwana fragmentation, possibly with recent reactivation associated with rifting along the East African Rift System. Before analysis, data were reduced to the pole and upward continued to 1 km above the Earth’s surface. Preliminary depth estimates of the bottom of magnetic bodies were assessed for 100 km square regions, with maximum depths for eastern Zambia, including the Luangwa Rift, of approximately 14-17 km. While CPD results show no difference between the mapped rift and the uplifted shoulders, within the Bangwelu block the maximum depth extends to 22 km. The relative shallow CPDs may be related to shallow magmatic sources, possibly the result of the African Superplume under Zambia.