Mineralogical and Geochemical Characteristics of Mfyome Talc-Bearing Rocks from Usagaran Belt, Tanzania: Implication for Industrial Applications

Abstract

The Mfyome talc-bearing rocks occurrence is found in the Konse Group of the Paleoproterozoic Usagaran Belt. Despite its known occurrence, the mineralogical, geochemical, and physical properties have not been studied to ascertain its potential for industrial applications. This study, therefore, investigated the mineralogical and geochemical characteristics of talc-bearing rocks in the Mfyome area to determine industrial suitability. Integration of fieldwork, petrographic studies, X-ray diffraction, and geochemical (XRF and ICP-MS) analyses were employed to comprehensively characterize them. Mineralogical studies reveal talc (average 57.5%) is the dominant mineral phase and it is associated with quartz, feldspar, muscovite, sericite, calcite and opaque minerals. This diverse range of mineral associations suggests that the protolith of the talc-bearing rocks is of sedimentary origin, particularly dolomitic carbonate rocks. The geochemical analysis indicates that the talc-bearing rocks are characterized by high SiO₂ (52.93%) and MgO (36.59%) contents, with low Fe₂O₃ (1.15%), Al₂O₃ (3.12%), and CaO (0.26%). Notably, the low concentrations of Ni (40.83ppm), Co (16.74ppm), and Cr (16ppm) further support the sedimentary provenance of the talc-bearing rocks, as these trace elements are typically enriched in talc deposits of ultramafic origin. Based on the mineralogical and geochemical characteristics, the talc-bearing resources are suitable for use in the manufacturing of low-loss electron ceramics, paper, plastic, and roofing and the talc-bearing rocks of “talc + chlorite” assemblages are suitable for the paint industry. It requires appropriate beneficiation to be suitable for the rubber and textiles industries. Further, its composition doesn’t meet the necessary criteria as a raw material for wall and floor tiles, electrical insulation ceramics, paints, cosmetics, pharmaceuticals, food, and refractory industries. This study provided valuable insights into the geology and industrial potential of the talc-bearing resources in the Mfyome area, which contribute to the sustainable development of the mining and manufacturing sectors in Tanzania