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Geological Mapping

Geological Mapping

The Archaean basement in the area is dominated by banded biotite gneisses (Rollinson, 2016), with some areas of pyroxene and hornblende-bearing gneiss (indicating granulite and amphibolite facies). Most of the gneisses are felsic in composition, but more mafic to ultramafic bodies (dominated by amphibolites) form masses a few centimeters to a few meters in size within the gneisses (MacFarlane et al., 1981). Migmatitic textures are common, with abundant sheets and veins of granite and granitic pegmatite cutting the gneissose banding. These veins and sheets are deformed in shear zones, such as those which bound the Sula Mountains Belt. (Goodenough et al., 2018).
Figure 2:NMA Geologist studying material containing spodumene and lithium minerals.
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In contrast to the 2004 Geological Map of Sierra Leone by the Geoscience Society of South Africa, the 2020 geological map shows a more comprehensive lithological hosting of a dolerite intrusion along the margins of the Rokel River Group and the Archean Tonalite Trondhjemite-Granodiorite (TTG). A combination of magnetic, radiometric, topographic, and multi-spectral data were used to create the 2020 map.