Gold-bearing granitoid deposits have recently been discovered in the Birimian of Ghana but their mode of formation and ore genesis remain enigmatic. This study presents petrographic, and geochemical characteristics of mineralised and unmineralised (gold grade >0.05 and <0.05 g/t respectively) granitoids (now gneisses) and schists (metasedimentary) to evaluate their petrogenesis/provenance, and relationship to gold mineralisation in the Abansuoso area. The unmineralised rocks comprise biotite- and hornblende-biotite gneisses, sericite-quartz, carbonate-sericite, and biotite-quartz schist. The mineralised varieties are biotite-, muscovite gneiss, iron-carbonate-sericite, carbonate-sericite-quartz, chlorite-carbonate, and biotite-carbonate schist. The mineralised and unmineralised gneisses are both metaluminous and peraluminous. Both mineralised and unmineraised gneiss and schist show Nb-Ta trough, depleted LILE and enriched HFSE although widespread overall trace element concentrations for the mineralised rocks on UCC-normalised multi-element diagram, suggestive of their formation in an arc setting. This suggests coeval granitic plutonism and sedimentation with subduction-accretion during the Eburnean orogeny, hence, mineralisation may be orogenic-type.
AbittyEK, DampareSB, NudePM, AsieduDK.2016. Geochemistry and petrogenesis of the K-rich ‘Bongo-type'granitoids in the Paleoproterozoic Bole–Nangodi greenstone belt of Ghana.J Afr Earth Sci. 122:47–62.
2.
AgbenyeziTK, FoliG, GawuSK.2020. Geochemical characteristics of gold-bearing Granitoids at Ayanfuri in the Kumasi Basin, Southwestern Ghana: implications for the orogenic related gold systems.Earth Sci Malaysia (ESMY). 4(2):127–134.
3.
AlliboneA, HaydenP, CameronG, DukuF.2004. Paleoproterozoic gold deposits hosted by albite-and carbonate-altered tonalite in the Chirano District, Ghana, West Africa.Econ Geol. 99(3):479–497.
4.
AmponsahPO, SalviS, DidierB, BaratouxL, SiebenallerL, JessellM, NudePM, GyawuEA.2016. Multistage gold mineralization in the Wa-Lawra greenstone belt, NW Ghana: The Bepkong deposit.J Afr Earth Sci. 120:220–237.
5.
BaratouxL, MetelkaV, NabaS, JessellMW, GrégoireM, GanneJ.2011. Juvenile Paleoproterozoic crust evolution during the Eburnean orogeny (∼ 2.2-2.0 Ga), western Burkina Faso.Precambrian Res. 191(1–2):18–45.
6.
BarbarinB.1990. Granitoids: main petrogenetic classifications in relation to origin and tectonic setting.Geol J. 25(3–4):227–238.
7.
BarbarinB.1999. A review of the relationships between granitoid types, their origins and their geodynamic environments.Lithos. 46(3):605–626.
8.
BarkerF.1979. Trondhjemite: definition, environment and hypotheses of origin. In: Developments in petrology, vol. 6. Amsterdam (Netherlands): ElsevierSage UK: London, England; p. 1–12.
9.
BhatiaMR, CrookKA.1986. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins.Contrib Mineral Petrol. 92(2):181–193.
10.
BouabdellahM, SlackJF.2016. Geologic and metallogenic framework of North Africa. In: SlackJ, editor. Mineral deposits of North Africa. Cham: SpringerSage UK: London, England; p. 3–81.
11.
CondieKC.1993. Chemical composition and evolution of the upper continental crust: contrasting results from surface samples and shales.Chem Geol. 104(1–4):1–37.
12.
CullersRL.1994. The controls on the major and trace element variation of shales, siltstones, and sandstones of Pennsylvanian-Permian age from uplifted continental blocks in Colorado to platform sediment in Kansas, USA.Geochim Cosmochim Acta. 58(22):4955–4972.
13.
CullersRL.1995. The controls on the major-and trace-element evolution of shales, siltstones and sandstones of Ordovician to Tertiary age in the wet Mountains region, Colorado, USA.Chem Geol. 123(1–4):107–131.
14.
CullersRL.2000. The geochemistry of shales, siltstones and sandstones of Pennsylvanian–Permian age, Colorado, USA: implications for provenance and metamorphic studies.Lithos. 51(3):181–203.
15.
CullersRL, PodkovyrovVN.2002. The source and origin of terrigenous sedimentary rocks in the Mesoproterozoic Ui group, south-eastern Russia.Precambrian Res. 117(3–4):157–183.
16.
DampareSB, ShibataT, AsieduDK, OsaeS, Banoeng-YakuboB.2008. Geochemistry of Paleoproterozoic metavolcanic rocks from the southern Ashanti volcanic belt, Ghana: petrogenetic and tectonic setting implications.Precambrian Res. 162(3–4):403–423.
17.
FloydPA, LeveridgeBE.1987. Tectonic environment of the Devonian Gramscatho basin, south Cornwall: framework mode and geochemical evidence from turbiditic sandstones.J Geol Soc London. 144(4):531–542.
18.
FougerouseD, MicklethwaiteS, UlrichS, MillerJ, GodelB, AdamsDT, McCuaigTC.2017. Evidence for two stages of mineralization in West Africa's largest gold deposit: Obuasi, Ghana.Econ Geol. 112(1):3–22.
19.
GalippK, KlemdR, HirdesW.2003. Metamorphism and geochemistry of the paleoproterozoic Birimian sefwi volcanic belt (Ghana, West Africa).Geologisches Jahrbuch D. 111:151–191.
20.
GirtyGH, HansonAD, KnaackC, JohnsonD.1994. Provenance determined by REE, Th, and Sc analyses of metasedimentary rocks, Boyden Cave roof pendant, central Sierra Nevada, California.J Sediment Res. 64(1b):68–73.
21.
GoldfarbRJ, BakerT, DubéB, GrovesDI, HartCJ, GosselinP.2005. Distribution, character, and genesis of gold deposits in metamorphic terrain.
22.
GoldfarbRJ, GrovesDI.2015. Orogenic gold: common or evolving fluid and metal sources through time.Lithos. 233:2–26.
23.
GoldfarbRJ, GrovesDI, GardollS.2001. Orogenic gold and geologic time: a global synthesis.Ore Geol Rev. 18(1–2):1–75.
24.
GrenholmM.2011. Petrology of Birimian granitoids in southern Ghana: petrography and petrogenesisDissertations in Geology at Lund University, Lund, Sweden.
25.
GriffisJ, BarningK, AgezoFL, AkosaF.2002. Gold deposits of Ghana prepared on behalf of Ghana mineral commission. Ghana: Accra. 432.
26.
GriffisRJ, AgezoFL.2000. Mineral occurrence and exploration potential of northern Ghana. Mineral Commission Report. 132–1133, Accra.
27.
GrovesDI, GoldfarbRJ, Gebre-MariamM, HagemannSG, RobertF.1998. Orogenic gold deposits: a proposed classification in the context of their crustal distribution and relationship to other gold deposit types.Ore Geol Rev. 13(1–5):7–27.
28.
GrovesDI, GoldfarbRJ, RobertF, HartCJ.2003. Gold deposits in metamorphic belts: overview of current understanding, outstanding problems, future research, and exploration significance.Econ Geol. 98(1):1–29.
29.
HartCJ, GoldfarbRJ, QiuY, SneeL, MillerLD, MillerML.2002. Gold deposits of the northern margin of the North China Craton: multiple late Paleozoic–Mesozoic mineralizing events.Miner Deposita. 37(3):326–351.
30.
HayashiKI, FujisawaH, HollandHD, OhmotoH.1997. Geochemistry of∼ 1.9 Ga sedimentary rocks from northeastern Labrador, Canada.Geochim Cosmochim Acta. 61(19):4115–4137.
31.
JessellMW, AmponsahPO, BaratouxL, AsieduDK, LohGK, GanneJ.2012. Crustal-scale transcurrent shearing in the paleoproterozoic Sefwi-Sunyani-Comoe region, West Africa.Precambrian Res. 212:155–168.
32.
KazapoeRW, OlugbengaO, ArhinE, OlisaO.2021. Isotope geochemistry as a tool in the exploration of gold occurrences in Ghana: a review.Arab J Geosci. 14(19):1–15.
33.
KazapoeWR, OkunlolaO, ArhinE, OlisaO, HarrisC, KwayisiD, TorkonooS, AmuahEEY.2022. Geology and isotope systematics of gold deposits in Abansuoso area of Sefwi Belt, Southwestern Ghana.Geol Ecol Landscapes. 6:1–22.
34.
KempeU, BelyatskyB, KrymskyR, KremenetskyA, IvanovP.2001. Sm–Nd and Sr isotope systematics of scheelite from the giant Au (–W) deposit Muruntau (Uzbekistan): implications for the age and sources of Au mineralization.Miner Deposita. 36(5):379–392.
35.
LiuY, ChakhmouradianAR, HouZ, SongW, KynickýJ.2019. Development of REE mineralization in the giant Maoniuping deposit (Sichuan, China): insights from mineralogy, fluid inclusions, and trace-element geochemistry.Miner Deposita. 54(5):701–718.
36.
McFarlaneHB, AilleresL, BettsP, GanneJ, BaratouxL, JessellMW, BlockS.2019. Episodic collisional orogenesis and lower crust exhumation during the Palaeoproterozoic Eburnean Orogeny: evidence from the Sefwi Greenstone Belt, West African Craton.Precambrian Res. 325:88–110.
37.
McLennanSM, TaylorSR.1991. Sedimentary rocks and crustal evolution: tectonic setting and secular trends.J Geol. 99(1):1–21.
38.
NanceWB, TaylorSR.1977. Rare earth element patterns and crustal evolution – II. Archean sedimentary rocks from Kalgoorlie, Australia.Geochim Cosmochim Acta. 41(2):225–231.
39.
OberthürT, VetterU, DavisDW, AmanorJA.1998. Age constraints on gold mineralization and Paleoproterozoic crustal evolution in the Ashanti belt of southern Ghana.Precambrian Res. 89(3–4):129–143.
40.
PearceJA.1996. A user's guide to basalt discrimination diagrams. Trace element geochemistry of volcanic rocks: applications for massive sulphide exploration. Geological Association of Canada, Short Course Notes, 12, 79–113.
41.
PerroutyS, AillèresL, JessellMW, BaratouxL, BourassaY, CrawfordB.2012. Revised eburnean geodynamic evolution of the gold-rich southern Ashanti Belt, Ghana, with new field and geophysical evidence of pre-Tarkwaian deformations.Precambrian Res. 204:12–39.
42.
PhillipsGN, PowellR.2009. Formation of gold deposits: review and evaluation of the continuum model.Earth Sci Rev. 94(1–4):1–21.
43.
SakyiPA, AddaeRA, SuBX, DampareSB, AbittyE, SuBC, LiuB, AsieduDK.2020. Petrology and geochemistry of TTG and K-rich Paleoproterozoic Birimian granitoids of the West African Craton (Ghana): petrogenesis and tectonic implications.Precambrian Res. 336:105492.
44.
SakyiPA, AnumS, SuBX, NudePM, SuBC, AsieduDK, KwayisiD.2018. Geochemical and Sr-Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: evidence for petrogenesis and tectonic setting.Geol J. 53(2):725–741.
45.
SchianoP, DupréB, LewinE.1993. Application of element concentration variability to the study of basalt alteration (Fangataufa atoll, French Polynesia).Chem Geol. 104(1–4):99–124.
46.
SenyahGA, DampareSB, AsieduDK.2016. Geochemistry and tectonic setting of the Paleoproterozoic metavolcanic rocks from the Chirano Gold District, Sefwi belt, Ghana.J Afr Earth Sci. 122:32–46.
47.
ShandSJ.1948. Eruptive rocks: their genesis, composition, classification, and their relation to ore deposits, with a chapter on meteorites.J Geol. 56(6):593–593.
48.
SillitoeRH.1991. Intrusion-related gold deposits. In: FosterRP, editor. Gold metallogeny and exploration. Boston (MA): SpringerSage UK: London, England; p. 165–209.
49.
SmithAJ, HenryG, Frost-KillianS.2016. A review of the Birimian Supergroup-and Tarkwaian group-hosted gold deposits of Ghana.Episodes. 39(2):177–197.
50.
Takyi-KyeremehK, WemegahDD, PrekoK, MenyehA.2019. Integrated geophysical study of the Subika Gold Deposit in the Sefwi Belt. Ghana.Cogent Geosci. 5(1):1585406.
51.
TaylorSR, McLennanSM.1985. The continental crust: its composition and evolution. Oxford: Blackwell Scientific PublicationsSage UK: London, England.
52.
VermaSP, Armstrong-AltrinJS.2016. Geochemical discrimination of siliciclastic sediments from active and passive margin settings.Sediment Geol. 332:1–12.
53.
WhitneyDL, EvansBW.2010. Abbreviations for names of rock-forming minerals.Am Mineral. 95(1):185–187.
54.
YoungGM, Wayne NesbittH.1999. Paleoclimatology and provenance of the glaciogenic Gowganda Formation (Paleoproterozoic), Ontario, Canada: A chemostratigraphic approach.Geol Soc Am Bull. 111(2):264–274.
