Evolution of hydrothermal fluids in the Ashanti gold belt, Ghana: Stable isotope geochemistry of carbonates, graphite, and quartz

Economic Geology

Volumn 91, Issue 1, 1996, Pages 135-148

  Mumin, A H ^a   Fleet, M E ^a   Longstaffe, F J ^a  

^a UNIVERSITY OF WESTERN ONTARIO   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

CARBONATE; GOLD; GRAPHITE; HYDROTHERMAL FLUID; ISOTOPIC ANALYSIS; QUARTZ;

GHANA, ASHANTI BELT;

EID: 0030478672     PISSN: 03610128     EISSN: None     Source Type: Journal    
DOI: 10.2113/gsecongeo.91.1.135     Document Type: Article

References (77)

1. Adjimah, C.L., 1988, Petrological studies on the genesis of the gold deposits of Prestea, Ghana: Unpublished Ph.D. thesis, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, 274 p.
2. Al-Aasm, I.S., Taylor, B.E., and South, B., 1990, Stable isotope analysis of multiple carbonate samples using selective acid extraction: Chemical Geology, v. 80, p. 119-125.
3. 3: Journal of Petrology, v. 28, p. 389-414.
4. Ansdell, K.M., and Kyser, T.K., 1992, Mesothermal gold mineralization in a Proterozoic greenstone belt: Western Flin Flon domain, Saskatchewan, Canada: ECONOMIC GEOLOGY, v. 87, p. 1496-1524.
5. Appiah, H., Norman, D.I., and Boadi, I., 1991, The geology of the Prestea and Ashanti goldfields: A comparative study, in Ladeira, E.A., ed., Brazil gold '91: Rotterdam, Balkema, p. 247-255.
6. Arnorsson, S., 1978, Precipitation of calcite from flashed geothermal waters in Iceland: Contributions to Mineralogy and Petrology, v. 66, p. 21-28.
7. 18O content of standard mean ocean water: Earth and Planetary Science Letters, v. 31, p. 341.
8. Becker, R.H., and Clayton, R.N., 1976, Oxygen isotope study of a Precambrian banded iron-formation, Hamersley Range, Western Australia: Geochimica et Cosmochimica Acta, v. 40, p. 1153-1165.
9. Bottinga, Y., 1968, Calculation of fractionation factors for carbon and oxygen isotopic exchange in the system calcite-carbon dioxide-water: Journal of Physical Chemistry, v. 72, p. 800-808.
10. _1969, Calculated fractionation factors for carbon and hydrogen isotope exchange in the system calcite-carbon dioxide-graphite-methane-hydrogen-water vapour: Geochimica et Cosmochimica Acta, v. 33, p. 49-64.
11. Bowers, T.S., 1991, The deposition of gold and other metals: Pressure-induced fluid immiscibility and associated isotopic signatures: Geochimica et Cosmochimica Acta, v. 55, p. 2417-2434.
12. Bowman, J.R., Covert, J.J., Clark, A.H., and Mathieson, G.A., 1985, The CanTung E zone scheelite skam orebody, Tungsten, Northwest Territories: Oxygen, hydrogen and carbon isotope studies: ECONOMIC GEOLOGY, v. 80, p. 1872-1895.
13. Brown, K.L., 1989, Kinetics of gold precipitation from experimental hydrothermal sulfide solutions: ECONOMIC GEOLOGY MONOGRAPH 6, p. 320-327.
14. Byrne, T., and Fisher, D., 1987, Episodic growth of the Kodiak convergent margin: Nature, v. 325, p. 338-341.
15. 2-siderite: Geochimica et Cosmochimica Acta, v. 52, p. 2445-2450.
16. Clayton, R.N., and Mayeda, T.K., 1963, The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis: Geochimica et Cosmochimica Acta, v. 27, p. 43-52.
17. Cole, D.R., and Ohmoto, H., 1986, Kinetics of isotope exchange at elevated temperatures and pressures: Reviews in Mineralogy, v. 16, p. 41-90.
18. Craig, H., 1957, Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide: Geochimica et Cosmochimica Acta, v. 12, p. 133-149.
19. Criss, R.E. and Taylor, H.P., 1986, Meteoric-hydrothermal systems: Reviews in Mineralogy, v. 16, p. 373-424.
20. de Ronde, C.E.J., de Wit, M.J., Spooner, E.T.C., and Bray, C.J., 1991, Mafic-ultramafic hosted, shear zone related, Au-quartz vein deposits in die Barberton greenstone belt. South Africa: Structural style, fluid properties and light stable isotope geochemistry, in Ladeira, E.A., ed., Brazil gold '91: Rotterdam, Balkema, p. 279-286.
21. Drummond, S.E., 1981, Boiling and mixing of hydrothermal fluids: Chemical effects on mineral precipitation: Unpublished Ph.D. thesis, Pennsylvania State University.
22. Drummond, S.E., and Ohmoto, H., 1985, Chemical evolution and mineral deposition in boiling hydrothermal systems: ECONOMIC GEOLOGY, v. 80, p. 126-147.
23. Engster, H.P., 1959, Oxidation and reduction in metamorphism, in Ableson, P.H., ed., Researches in geochemistry: New York, John Wiley and Sons, p. 397-426.
24. _1976, Compositions and thermodynamics of metamorphic solutions, in Fraser, D.G., ed., Thermodynamics in geology: Dordrecht, Reidel, p. 183-202.
25. Ferry, J.M., and Baumgartner, L., 1987, Thermodynamic models of molecular fluids at the elevated pressures and temperatures of crustal metamorphism: Reviews in Mineralogy, v. 17, p. 323-365.
26. Fisher, R.S., and Land, L.S., 1986, Diagenetic history of Eocene Wilcox sandstones, south-central Texas: Geochimica et Cosmochimica Acta, v. 50, p. 551-561.
27. Friedman, I., and O'Neil, J.R., 1977, Compilation of stable isotope fractionation factors of geochemical interest: U.S. ecological Survey Professional Paper 440-KK.
28. Frost, B.R., 1979, Mineral equilibria involving mixed-volatiles in a C-O-H fluid phase: The stabilities of graphite and siderite: American Journal of Science, v. 279, p. 1033-1059.
29. 4 under geothermal conditions: Geochimica et Cosmochimica Acta, v. 46, p. 159-165.
30. Goldfarb, R.J., Leach, D.L., Rose, S.C., and Landis, G.P., 1989, Fluid inclusion geochemistry of gold-bearing quartz veins of the Juneau gold belt, southwestern Alaska: ECONOMIC GEOLOGY MONOGRAPH 6, p. 363-375.
31. Goldfarb, R.J., Newberry, R.J., Pickthorn, W.J. and Ghent, C.A., 1991, Oxygen, hydrogen, and sulfur isotope studies in the Juneau gold belt, south-eastern Alaska: Constraints on the origin of hydrothermal fluids: ECONOMIC GEOLOGY, v. 86, p. 66-80.
32. Golding, S.D., McNaughton, N.J., Barley, M.E., Groves, D.I., Ho, S.E., Rock, N.M.S., and Turner, J.V., 1988, Archean carbon and oxygen reservoirs: Their significance for fluid sources and circulation paths for Archean mesothermal gold deposits of the Norseman-Wiluna belt. Western Australia: ECONOMIC GEOLOGY MONOGRAPH 6, p. 376-388.
33. Golyshev, S.I., Padalko, N.L., and Pechenkin, S.A., 1981, Fractionation of stable oxygen and carbon isotopes in carbonate systems: Geochemistry International, v. 18, no. 5, p. 85-99. (Translated from Geokhimiya, v. 10, p. 1427-1441.)
34. Hastings, D.A., 1982, On the tectonics and metallogenesis of West Africa: A model incorporating new geophysical data: Geoexploration, v. 20, p. 295-327.
35. Haynes, S.J., 1986, Geology and chemistry of turbidite-hosted gold deposits, greenschist facies, eastern Nova Scotia: Geological Association of Canada Special Paper 32, p. 161-178.
36. 2 separation from a carbon dioxide rich hydrothermal fluid: Evidence for the Gray River tungsten deposit: Canadian Journal of Earth Sciences, v. 19, p. 2247-2257.
37. Junner, N.R., 1940, Geology of the Gold Coast and Western Togoland: Ghana Geological Survey, Bulletin 11.
38. Kerrich, R., 1987a, The stable isotope geochemistry of Au-Ag vein deposits in metamorphic rocks: Mineralogical Association of Canada Short Course Handbook, v. 13, p. 287-336.
39. _1987b, Stable isotope studies of fluids in the crust: Mineralogical Association of Canada Short Course Handbook, v. 13, p. 258-286.
40. Kerrich, R., and Wyman, D., 1990, Geodynamic setting of mesothermal gold deposits: An association with accretionary tectonic regimes: Geology, v. 18, p. 882-885.
41. Kesse, G.O., 1985, The mineral and rock resources of Ghana: Rotterdam, Balkema, 610 p.
42. Klemd, R., Hirdes, W., Olesch, M., and Oberthür, T., 1993, Fluid inclusions in quartz-pebbles of the gold-bearing Tarkwaian conglomerates of Ghana as guides to their provenance area: Mineralium Deposita, v. 28, p. 334-343.
43. Kontak, D.J., and Smith, P.K., 1993, A metaturbidite-hosted lode gold deposit: The Beaver Dam deposit, Nova Scotia. 1. Vein paragenesis and mineral chemistry: Canadian Mineralogist, v. 31, p. 471-522.
44. 18O in carbonates during contact metamorphism at Marysville, Montana: Implications for isotope systematics in pure dolomite limestones: American Journal of Science, v. 280, p. 890-906.
45. Leitch, C.H.B., Godwin, C.I., Brown, T.H., and Taylor, B.E., 1991, Geochemistry of mineralizing fluids in the Bralome-Pioneer mesothermal gold vein deposit, British Columbia, Canada: ECONOMIC GEOLOGY, v. 86, p. 318-353.
46. Leube, A., Hirdes, W., Mauer, R., and Kesse, G.O., 1990, The Early Proterozoic Birimian Supergroup of Ghana and some aspects of its associated gold mineralization: Precambrian Research, v. 46, p. 139-165.
47. Matsuhisa, Y., Goldsmith, J.R., and Clayton, R.N., 1979, Oxygen isotopic fractionation in the system quartz-albite-anorthite-water: Geochimica et Cosmochimica Acta, v. 43, p. 1131-1140.
48. McCrea, J.M., 1950, On the isotopic chemistry of carbonates and a paleotemperature scale: Journal of Chemical Physics, v. 18, p. 849-857.
49. Michel, D., Giuliani, G., Olivo, G.R., and Marini, O.J., 1994, As growth banding and the presence of Au in pyrites from the Santa Rita gold vein deposit hosted in Proterozoic metasediments, Goiás State, Brazil: ECONOMIC GEOLOGY, v. 89, p. 193-200.
50. Milesi, J.P., Ledru, P., Feybesse, J.L., Dommanget, A., and Marcoux, E., 1992, Early Proterozoic ore deposits and tectonics of the Birimian orogenic belt. West Africa: Precambrian Research, v. 58, p. 305-344.
51. Mumin, A.H., 1994, Early Proterozoic Birimian gold mineralization of the Bogosu and Prestea districts of the Ashanti gold belt, Ghana, West Africa: Unpublished Ph.D. thesis, London, Canada, University of Western Ontario, 312 p.
52. Mumin, A.H., and Fleet, M.E., 1995, Evolution of gold mineralization in the Ashanti gold belt, Ghana: Evidence from carbonate mineral-chemistry and paragenesis: Mineralogy and Petrology, v. 55, p. 265-280.
53. Mumin, A.H., Fleet, M.E., and Chryssoulis, S.L., 1994, Gold mineralization in As-rich mesothermal gold ores of the Bogosu-Prestea mining district of the Ashanti gold belt, Ghana: Remobilization of "invisible" gold: Mineralium Deposita, v. 29, p. 445-460.
54. Nesbitt, B.E., 1992, Orogeny, crustal hydrogeology and the generation of epigenetic ore deposits in the Canadian Cordillera: Mineralogy and Petrology, v. 45, p. 153-179.
55. Nesbitt, B.E., and Muehlenbachs, K., 1989, Origins and movement of fluids during deformation and metamorphism in the Canadian Cordillera: Science, v. 245, p. 733-736.
56. Oberthür, T., Vetter, U., Schmidt Mumm, A., Weiser, T., Amanor, J.A., Gyapong, W.A., Kumi, R., and Blenkinsop, T.G., 1994, The Ashanti gold mine at Obuasi, Ghana: Mineralogical, geochemical, stable isotope and fluid inclusion studies on the metallogenesis of the deposit: Geologisches Jahrbuch, v. 100, p. 31-129.
57. Ohmoto, H., 1986, Stable isotope geochemistry of ore deposits: Reviews in Mineralogy, v. 16, p. 491-559.
58. Ohmoto, H., and Kerrick, D.M., 1977, Devolatilization equilibria systems: American Journal of Science, v. 277, p. 1013-1044.
59. Ohmoto, H., and Rye, R.O., 1979, Isotopes of sulfur and carbon, in Barnes, H.L., ed., Geochemistry of hydrothermal ore deposits, 2nd ed.: New York, J. Wiley, p. 509-567.
60. 3: An experimental study: Journal of Metamorphic Geology, v. 2, p. 33-41.
61. Rosenbaum, J., and Sheppard, S.M.F., 1986, An isotopic study of siderites, dolomites and ankerites at high temperatures: Geochimica et Cosmochimica Acta, v. 50, p. 1147-1150.
62. Sample, J.C., and Moore, J.C., 1987, Structural style and kinematics of an underplated slate belt, Kodiak and adjacent islands, Alaska: Geological Society of America Bulletin 99, p. 7-20.
63. Sandiford, M., and Keays, R.R., 1986, Structural and tectonic constraints on the origin of gold deposits in the Ballarat slate belt, Victoria: Geological Association of Canada Special Paper 32, p. 15-24.
64. Sestini, G., 1973, Sedimentology of a paleoplacer: The gold-bearing Tarkwaian of Ghana, in Amstutz, G.C., and Bernard A.J., eds., Sedimentary ores: Berlin, Springer Verlag, p. 275-305.
65. Seward, T.M., 1989, The hydrothermal chemistry of gold and its implications for ore formation: Boiling and conductive cooling as examples: ECONOMIC GEOLOGY MONOGRAPH 6, p. 398-404.
66. 16 ratios of total oxygen of carbonates: Geochimica et Cosmochimica Acta, v. 29, p. 1347-1353.
67. Shenberger, D.M., and Barnes, H.L., 1989, Solubility of gold in aqueous sulfide solutions from 150 to 350°C: Geochimica et Cosmochimica Acta, v. 53, p. 269-278.
68. Sheppard, S.M.F., and Schwarcz, H.P., 1970, Fractionation of carbon and oxygen isotopes and magnesium between coexisting metamorphic calcite and dolomite: Contributions to Mineralogy and Petrology, v. 26, p. 161-198.
69. Skippen, G.B., and Marshall, D.B., 1991, The metamorphism of granulites and devolatilization of the lithosphere: Canadian Mineralogist, v. 29, p. 693-705.
70. 2 phase separation as a precipitation and dilation mechanism: Ontario Geological Survey Miscellaneous Paper 136, p. 35-55.
71. Taylor, B.E., 1986, Magmatic volatiles: Isotopic variation of C, H, and S: Reviews in Mineralogy, v. 16, p. 185-226.
72. _1987, Stable isotope geochemistry of ore-forming fluids: Mineralogical Association of Canada Short Course Handbook, v. 13, p. 337-445.
73. Taylor, P.N., Moorbath, S., Leube, A., and Hirdes, W., 1992, Early Proterozoic crustal evolution in the Birimian of Ghana: Constraints from geochronology and isotope geochemistry: Precambrian Research, v. 56, p. 97-111.
74. Truesdell, A.H., 1974, Oxygen isotope activities and concentrations in aqueous salt solutions at elevated temperatures-consequences for isotope geochemistry: Earth and Planetary Science Letters, v. 23, p. 387-396.
75. 12C exchange between calcite and graphite: A possible thermometer in Grenville marbles: Geochimica et Cosmochimica Acta, v. 45, p. 411-419.
76. Wada, H., and Suzuki, K., 1983, Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures: Geochimica et Cosmochimica Acta, v. 47, p. 697-706.
77. Wang, G.M., and White, S.H., 1993, Gold mineralization in shear zones within a turbidite terrane, examples from Central Victoria, S.E. Australia: Ore Geology Reviews, v. 8, p. 163-188.