Abstract
This study presents gold mineralisation and pathfinder elements characteristics in five surficial regolith profiles, with the aim of enhancing exploration strategies in the north-eastern Bole-Nangodi Gold Belt in Ghana. Samples were collected from mature soils and bedrocks in exploration pits and prepared for chemical and soil particle size analysis. 13 major elements, mineral forms and fifty-one trace elements were analysed using XRF, XRD and ICP-MS devices, respectively. SiO2, Fe2O3–MnO and Al2O3 are elevated in the A, B and C horizons, respectively, while Na2O–K2O–MgO–CaO–P2O5 systems dominate the bedrocks. Gold pathfinder element suites of As–Mo–Ag–Sn–Sb–Te–W–Hg–Bi are above Primitive Mantle values by a factor of > 5, while the mean chemical index of alteration (CIA) values are above 80%. Profiles contain > 70% quartz with stable mineral concentrations of 53, 18 and 29% in the A, B and C, horizons, respectively. The B horizon is the most altered horizon based on CIA, loss on ignition and Fe/Al ratios; the horizon accounts for 52% of the material and 76% of elements in the > 2 mm particle size. Mass balance and principal component analysis shows that Au exploration targets and the associated pathfinder element suites are the following: (1) horizon A with Sr–Ca–Ge–Sn–Th in the amphibolite and biotite gneiss profiles (2) horizons A and B with S–K–Zr–Tl–Ge in the volcaniclastic and (3) the bedrocks with Cu–Pb–Sb–Ag–Mo and Mn–Cr–Ba–V–Ce–Bi–Fe–Co–Sb–As–Se of the metavolcanic and phyllite profiles, respectively. The regolith models summarise the mineralogical and structural framework of the profiles and may largely influence exploration designs.
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References
Affam M, Arhin E (2013) Lack of exploration success in Northern Ghana: problems and solutions. Res J Environ Sci 5:440–448
Ague JJ (1991) Evidence for major mass transfer and volume strain during regional metamorphism of pelites. Geology 19:855–858
Agyakwa YN (1979) Relationship between gold and manganese mineralizations in the Birimian of Ghana, West Africa. Geol Mag 116:345–352
Anand RR, Paine M (2002) Regolith geology of the Yilgarn Craton, Western Australia: implications for exploration. Aust J Earth Sci 49:3–162
Anand RR, Aspandiar MF, Noble RRP (2015) A review of metal transfer mechanisms through transported cover with emphasis on the vadose zone within the Australian regolith. Ore Geol Rev 73:394–416
Arhin E, Nude PM (2010) Use of termitaria in surficial geochemical surveys: evidence for > 125-mu m size fractions as the appropriate media for gold exploration in northern Ghana. Geochem Explor Environ Anal 10(4):401–406
Arhin E, Nude PM, Arhin E, Nude PM (2009) The significance of regolith mapping and its implication for gold exploration in northern Ghana: a case study at Tinga and Kunche. Geochem Explor Environ Anal 9:63–69
Attoh K (1982) Structure, gravity models and stratigraphy of an early Proterozoic volcanic-sedimentary belt in northeastern Ghana. Precambrian Res 18:275–290
Bladh W (1982) The formation of goethite and alunite during the weathering of Felsic Rocks. Econ Geol 77:176–184
Brimhall GH, Dietrich WE (1987) Constitutive mass balance relations between chemical composition, volume, density, porosity and strain in metasomatic hydrochemical systems: results on weathering and pedogenesis. Geochim Cosmochim Acta 51(4):567–587
Brimhall GH, Alpers CN, Cunningham AB (1985) Analysis of supergene ore-forming processes and ground-water solute transport using mass balance principles. Econ Geol 80(5):1227–1256
Brimhall GH et al (1991) Quantitative geochemical approach to pedogenesis: the importance of parent material reduction, volumetric expansion and eolian influx in lateritization. Geoderma 51:51–91
Butt CRM (1992) Exploration in areas of low to moderate relief. Semi-arid and arid terrains. Chap. III.3. In: Butt CRM, Zeegers H (eds) Handbook of exploration geochemistry: regolith exploration geochemistry in tropical and subtropical terrains, vol 4. Elsevier Science Publ. Co., pp 295–391
Butt CRM, Lintern MJ, Anand RR (2000) Evolution of regoliths and landscapes in deeply weathered terrain—implications for geochemical exploration. Ore Geol Rev 16:167–183
Cairns CJ, McQueen KG, Leah PA (2001) Mineralogical control on element dispersion in regolith over two mineralised shear zones near the Peak, Cobar, New South Wales. J Geochem Explor 72:1–21
Chen S, Grunsky EC, Hattori K, Liu Y (2015) Principal component analysis of geochemical data from the REE-rich Maw Zone, Athabasca Basin, Canada; Geological survey of Canada, Open File 7689. https://doi.org/10.4095/295615
Chung FH (1974) Quantitative interpretation of X-ray diffraction patterns of mixtures. I. Matrix-flushing method for quantitative multicomponent analysis. J Appl Crystallogr 7:519–525
Dzigbordi-Adjimah K (1993) Geology and geochemical patterns of the Birimian gold deposits, Ghana, West Africa. J Geochem Explor 47:305–320
Ebah SA, Ndjigui P, Beyanu AA, Teutsong T, Bilong P (2012) Geochemistry of pyroxenites, amphibolites and their weathered products in the Nyong unit, SW Cameroon (NW border of Congo craton): implications for Au—PGE exploration. J Geochem Explor 114:1–19
Foli G, Gawu Sky (2017) Modified acid-base accounting model validation and pH buffer trend characterisation in mine drainage at the AngloGold-Ashanti Obuasi mine in Ghana. West Afr Environ Earth Sci 76(19):663
Foli G, Nude PM (2012) Concentration levels of some Inorganic contaminants in streams and sediments in areas of pyrometallurgical and hydrometallurgical activities at the Obuasi mine, Ghana. Environ Earth Sci 65:753–763
Foli G, Nude PM, Apea OB (2012) Geochemical characteristics of soils from selected districts in the upper east region, Ghana: implications for trace element pollution and enrichment. Res J Environ Earth Sci 4:186–195
Foli G, Gawu Sky, Nude PM (2015) Arsenic contamination and secondary mineral evaluation in mine drainage using integrated acid-base accounting and toxicity characterisation leaching procedure: the case of Obuasi Mine, Ghana. Environ Earth Sci 73:8471–8486
Freyssinet P, Itard Y (1997) Geochemical mass balance of gold under various tropical weathering conditions: application to exploration. In: Gubins AG (ed) Proceedings of exploration 97; Exploration geochemistry paper 42: Fourth decennial international conference on mineral exploration, pp 347–354
Kock GS, De Théveniaut H, Botha PMW, Gyapong W (2012) Timing the structural events in the Palaeoproterozoic Bolé—Nangodi belt terrane and adjacent Maluwe basin, West African craton, in central-west Ghana. J Afr Earth Sci 65:1–24
Leube A, Hirdes W, Mauer R, Kesse GO (1990) The Early Proterozoic Birimian supergroup of Ghana and some aspects of its associated gold mineralisation. Precambrian Res 46:139–165
Mann AW (1984) Mobility of gold and silver in lateritic weathering profiles: some observations from Western Australia. Econ Geol 79(1):38–49
Marques JJ, Schulze DG, Curi N, Mertzman SA (2003) Trace element geochemistry in Brazilian Cerrado soils. Geoderma 121(1–2):31–43
Martínez-Alfaro PE (2004) Loss on ignition: a qualitative or quantitative method for organic matter and carbonate mineral content in sediments. J Paleolimnol 32:287–299
McDonough WF, Sun SS (1995) The composition of the Earth. Chem Geol 120:223–253
Nesbitt HW, Young GM (1982) Early Proterozoic climates and plate motions inferred from major element chemistry of lutites. Nature 299:715–717
Newell CJ, Aziz JJ, Vanderford M (2007) Appendix A.2: statistical trend analysis methods: http://www.gsi-net.com/en/software/free-software/. Accessed 24 Dec 2018
Nude PM, Asigri JM, Yidana SM, Arhin E, Foli G, Kutu JM (2012) Identifying Pathfinder elements for gold in multi-element soil geochemical data from the Wa-Lawra Belt, Northwest Ghana: a multivariate statistical approach. Int. J. Geosci 2012:62–70
Nude PM, Arhin E, Yidana SM, Foli G, Dowuona GNN (2014) Geochemical dispersion of elements and their correlation with gold in the Regolith at the Tetteh prospect of the Chirano gold mines in the Sefwi Belt of the Birimian, Southwestern Ghana. J Environ Earth Sci 4:1–18
Oberthur T, Vetter U, Davis DW, Amanor JA (1998) Age constraints on gold mineralization and Paleoproterozoic crustal evolution in the Ashanti belt of southern Ghana. Precambrian Res 89:129–143
Price JR, Velbel MA (2003) Chemical weathering indices applied to weathering profiles developed on heterogeneous felsic metamorphic parent rocks 202:397–416
Roquin C, Pasteur L (1990) Element distribution patterns in laterites of southern Mali : consequence for geochemical prospecting and mineral exploration. Mottles Podoretictua 5:303–315
Ruxton BP (1968) Measures of the degree of chemical weathering of rocks. J Geol 76(5):518–527
Santisteban JI, Dabrio CJ, Mediavilla R, Lo E, Garcı G, Castan S, Zapata MBR, Jose M, Mart PE (2004) Loss on ignition: a qualitative or quantitative method for organic matter and carbonate mineral content in sediments. J Paleolimnol 32:287–299
Schulze DG, Curi N, Marques JJ, Mertzman SA (2004) Trace element geochemistry in Brazilian Cerrado soils. Geod 121:31–43
Scott KM, Pain CF (2008) Regolith science, ISBN 978 1 4020 8859 9, Springer CSIRO Publishing, Australia
Tardy Y et al (1976) Pedogenesis, chemical weathering and processes of formation of some supergene ore deposits. In: Wolf KH (ed) Handbook of strata-bound and stratiform ore deposits. Elsevier Scientific Publishing Company, Amsterdam, pp 93–173
Taylor PN, Moorbath S, Leube A, Hirdes W (1992) Early Proterozoic crustal evolution in the Birimian of Ghana; constraints from geochronology and isotope geology. Precambrian Res 56:77–111
Yiran GAB, Kusimi JM, Kufogbe SK (2012) A synthesis of remote sensing and local knowledge approaches in land degradation assessment in the Bawku East District, Ghana. Int J Appl Earth Obs Geoinform 14(1):204–213
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The authors acknowledge the Senior Members of the Department of Geological Engineering and the Civil Engineering Laboratory technicians for their immense assistance during the research.
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Bayari, E.E., Foli, G. & Gawu, S.K.Y. Geochemical and pathfinder elements assessment in some mineralised regolith profiles in Bole-Nangodi gold belt in north-eastern Ghana. Environ Earth Sci 78, 268 (2019). https://doi.org/10.1007/s12665-019-8265-5
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DOI: https://doi.org/10.1007/s12665-019-8265-5