Abstract
Fluid inclusions in granite quartz from SW England provide a record of the complex and protracted hydrothermal history of this important metallogenic province. Regional variations in terms of the different types of inclusions can be correlated on an inter-pluton scale with both the texture of the host granite and the extent to which it is mineralized. On an intra-granite scale those areas where mineralization is particularly pronounced show a higher overall inclusion abundance than areas where little or no mineralization is known to occur. The types of fluid inclusion most commonly related to Sn-W-Cu mineralization are halite-free, moderate temperature inclusions. Inclusions containing visible CO2 at room temperature are restricted to two localities in SW England. Both of these contain stockwork/vein-swarm tungsten mineralization. These regional ‘fluid inclusion anomalies’ show that fluid inclusion petrography using a simple petrographic microscope has potential application in the field of mineral exploration.
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Alderton, D.H.M.: The geochemistry of mineralisation at Pendarves, and other Cornish areas. Unpubl. PhD thesis, University of London (1976)
Alderton, D.H.M., Rankin, A.H.: Fluid inclusion studies in the St. Austell granite. (Jl. Geol. Soc. Lond., 140, 297–310 (1983)
Alderton, D.H.M., Sheppard, S.M.F.: Chemistry and origin of thermal waters from southwest England. Trans. Instn. Min. Metall. (sect. B: Appl. earth Sci.) 86, B191–194 (1977)
Charoy, B.: Definition et importance des phenomènes deuteriques et des fluides associes dans les granites, consequences metallogeniques. Science Terre, Nancy, Mem. 37, 364 (1979)
Chivas, A.T., Wilkins, R.W.T.: Fluid inclusion studies in relation to hydrothermal alteration and mineralization at Koloula porphyry copper prospect. Guadalcanal. Econ. Geol. 72, 153–169 (1977)
Dangerfield, J., Hawkes, J.R.: The Variscan granites of south-west England: additional information. Proc. Ussher Soc. 5(2), 116–120 (1981)
Dines, H.G.: The metalliferous mining region of southwest England. Mem. Geol. Surv. U.K. 2 vols, HMSO (1956)
Edmonds, E.A., McKeown, M.C., Williams, M.: British regional geology: southwest England (fourth edition). HMSO, London (1975)
Evans, A.M., Haslam, H.W., Shaw, R.P.: Porphyry style copper-molybdenum mineralisation in the Ballachulish igneous complex, Argyllshire, with special reference to the fluid inclusions. Proc. Geol. Ass. 91, (1 & 2), 47–51 (1979)
Higgins, N.C.: Fluid inclusion evidence for the transport of tungsten by carbonate complexes in hydrothermal solutions. Can. J. Earth Sci. 17, 823–830 (1980)
Jackson, N.J., Moore, J.McM., Rankin, A.H.: Fluid inclusions and mineralization at Cligga Head, Cornwall, England. Jl. geol. Soc. Lond. 134, 343–349 (1977)
Jackson, N.J., Halliday, A.N., Sheppard, S.M.F., Mitchell, J.G.: Hydrothermal activity in the St Just mining district, Cornwall. In: Metallization associated with acid magmatism, Evans, A.M. (ed) John Wiley and Sons, New York, 385, 137–179 (1982)
Moore, J.McM.: Mineral zonation near the granite batholiths of south-west and northern England and some geothermal analogues. In: Metallization associated with acid magmatism. Evans, A.M. (ed) John Wiley and Sons, New York, 385, 229–241 (1982)
Rankin, A.H., Alderton, D.H.M.: Fluid inclusion studies on mineralized granites of the British Isles: an assessment of their use in the exploration for mineral deposits associated with granitic rocks. Final Report, Contract O41 MPP UK 168 p. EEC R & D programme on ‘Primary Raw Materials’ (1982)
Rankin, A.H., Alderton, D.H.M., Thompson, M., Goulter, J.E.: Determination of uranium: carbon ratios in fluid inclusion decrepitates by inductively-coupled plasma emission spectroscopy. Miner. Mag. 46, 179–186 (1982)
Roedder, E.: Fluid inclusions as tools in mineral exploration. Econ. Geol. 72, 503–525 (SEG distinguished lecture in scientific research) (1977)
Sheppard, S.M.F.: The Cornubian batholith, SW England: D/H and 18O/16O studies of kaolinite and other alteration minerals. Jl. geol. Soc. Lond. 133, 573–591 (1977)
Simpson, P.R., Brown, G.C., Plant, J., Ostle, D.: Uranium mineralization and granite magmatism in the British Isles. Phil. Trans. R. Soc. Lond. A291, 385–412 (1979)
Sorby, H.C.: On the microscopical structure of crystals, indicating the origin of minerals and rocks. Q. J. geol. Soc. London 14, 453–500 (1858)
Yermakov, N.P.: Use of gas-liquid inclusions in prospecting and exploration for postmagmatic ore deposits and blind ore bodies. Sovetskaya Geologiya 9, 77–90 (in Russian, translated in International Geology Review 9 (7), 947–956, listed as P P Ermakov) (1966)
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Rankin, A.H., Alderton, D.H.M. Fluid inclusion petrography of SW England granites and its potential in mineral exploration. Mineral. Deposita 18 (Suppl 2), 335–347 (1983). https://doi.org/10.1007/BF00206483
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DOI: https://doi.org/10.1007/BF00206483