Geochemistry of the Ironstones in Abiati Area, Southeastern Nigeria: Implications for Ore Genesis and Economic Potential

Authors

Keywords:

Ironstone, provenance, XRF, lateritisation, metasedimentary, beneficiation, Abiati, Nigeria.

Abstract

Iron is, from an economic perspective, the most significant metal. The ironstone resource at Abiati has been examined by integrating geochemical discrimination plots and statistical techniques to decipher its provenance, and economic potential. Twenty-five (25) representative ironstone samples were collected and subjected to laboratory analysis using XRF (X-Ray Flourescence) techniques to determine their chemical compositions. XRF results revealed SiO2 (8.201), Al2O3 (5.102), Fe2O3(t) (71.436), CaO (0.252), MgO (0.796), SO3 (0.004), K2O (0.052), Na2O (0.043), and LOI (12.298) on average; all in units of weight percent (wt.%). However, P2O5 and TiO2 were either not found in the samples or they were below detection limits. The absence of P2O5 and low concentration of MgO and SO3 suggest a warm-temperature, wide-range non-marine, lacustrine or shallow marine environment for the ironstones; thus, ruling out the possibility of full marine origin and/ or reworking. Low levels of CaO and the absence of CO3 indicate that the environment is oxidizing. Hence, the analyzed samples suggest deep weathering, strong lateritisation, metasedimentary origin, and a post-depositional secondary diagenetic modification (i.e., supergene enrichment) under oxidizing and shallow marine conditions within the post-Precambrian/ Phanerozoic age range. Compared with the generalized world market standards/ benchmarks, the computed ore grade results indicated a low-grade (Fe(t) - av. 49.962 wt.%) with an appreciable amount of impurities. Although it can be used for cement production, beneficiation is required to upgrade its quality to attain acceptable levels for usable iron ores, utilisation for cast iron and steel production, and valorisation in other industrial applications.

 

Author Biographies

  • Andrew Kalu Njoku, University of Calabar

    Department of Geology

  • Temple Okah Arikpo, University of Calabar

    Department of Geology

  • Godwin Terwase Kave, University of Calabar

    Department of Geology

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Published

2025-03-14

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