CHIPANTA Cyrus , BSc
C. Cyrus1, M. Clifford1, K. Banda1, M. Simusokwe1
1Department of Geology, University of Zambia, Lusaka, Zambia
The Machile-Zambezi Graben in the Western Province of Zambia represents a critical but under-explored sedimentary basin within the regional rift system. This study presents the preliminary results of a multi-physics geophysical investigation aimed at delineating the subsurface stratigraphy and structural architecture of the graben.
The primary method employed was Audio-Magnetotellurics (AMT) using the Metronix ADU-08e system. Data were acquired across the basin to produce high-resolution geo-electro stratigraphic profiles. To ensure data integrity, significant emphasis was placed on signal-to-noise ratio optimization and electrode grounding techniques within the highly resistive Kalahari sand cover, a known challenge in the region. This electromagnetic data was integrated with gravitational and geomagnetic surveys to map basement depth and identify boundary faults associated with graben development.
Preliminary results indicate a complex succession of sedimentary units, with resistivity contrasts effectively mapping the contact between the overlying Kalahari Group and the underlying Karoo Supergroup. Structural interpretations reveal a series of normal faults that characterize the graben's architecture, providing insights into the tectonic evolution of the region.
This integrated geophysical approach proves essential for identifying potential groundwater aquifers and assessing the broader mineral and hydrocarbon resource potential of the Machile-Zambezi Graben. The findings contribute to a more robust geological model of Western Zambia’s sedimentary basins, offering a framework for future targeted exploration.