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Bismuth-bearing assemblages from the Northern Pennine Orefield

Published online by Cambridge University Press:  05 July 2018

R. A. Ixer ,
B. Young  and
C. J. Stanley
R. A. Ixer
Affiliation:
School of Earth Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
B. Young
Affiliation:
British Geological Survey, Windsor Court, Windsor Terrace, Newcastle upon Tyne, NE2 4HB, UK
C. J. Stanley
Affiliation:
Department of Mineralogy, The Natural History Museum, Cromwell Road, London, SW7 3BD, UK
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Abstract

Bismuthinite-bearing quartz veins from the Alston Block of the North Pennine Orefield are all close to, or above, the Rookhope and Tynehead cupolas of the buried Weardale Granite. They are uniform in composition and paragenesis and are earlier than the main fluorite-baryte-galena-sphalerite mineralization of the orefield. Rhythmical crystallization of quartz, chalcopyrite and minor pyrite is followed by fluorite-quartz-chalcopyrite-minor sphalerite-altered pyrrhotite mineralization. Early tin-bearing (up to 0.29 wt.% Sn) chalcopyrite encloses trace amounts of bismuthinite (Bi2S3), synchysite (CaREE(CO3)F2), argentopentlandite (Ag(FeNi)8S8) (close to being stoichiometric), pyrrhotite, cubanite and cosalite (Pb2Bi2S5), while early pyrite carries monoclinic pyrrhotite (close to Fe7S8) and tungsten-bearing cassiterite (up to 1.03 wt.% WO3). Bismuthinite is macroscopically visible and is associated with native bismuth and small, fine-grained, spherical aggregates that qualitative analysis suggests may be cosalite crystals. Synchysite and more rarely monazite, xenotime and adularia are intergrown with bismuthinite. These mineralogical data form part of the basis for an increasing awareness of the contribution of the Weardale Granite to the early phases of mineralization in the Alston Block.

Keywords

bismuthinitesynchysiteargentopentlanditecosalitecassiteriteNorthern Pennine Orefield
Type
Petrology
Information
Mineralogical Magazine , Volume 60 , Issue 399 , April 1996 , pp. 317 - 324
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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References

Bott, M.H. (1967) Geophysical investigation of Northern Pennine basement rocks. Proc. Yorkshire Geol. Soc., 36, 139–68.CrossRefGoogle Scholar
British Geological Survey (1992) Regional geochemistry of the Lake District and adjacent areas. Keyworth. British Geological Survey, 98 pp.Google Scholar
Brown, G.C., Ixer, R.A., Plant, J. and Webb, P.C. (1987) Geochemistry of granites beneath the north Penines and their role in orefield mineralisation. Trans. Inst. Mining MetalL, 96, B65-77; discussion B231-2 and 97 (1988) B47-8.Google Scholar
Dunham, K.C. (1990) Geology of the northern Pennine orefield, Vol. 1 (Second edition). Tyne to Stainmore. Mem. Geol. Surv. Great Britain., 299 pp.Google Scholar
Flowers, A. (1986) Unpublished annual report. University of Aston.Google Scholar
Ineson, P.R. (1976) Ores of the northern Pennines, the Lake District and North Wales. Vol. 5 in Handbook of Stratabound and Stratiform Ore Deposits(Wolf, K.H., ed.). Elsevier, Amsterdam 197–230.Google Scholar
Ixer, R.A. (1986) The ore mineralogy and paragenesis of the lead-zinc-fluorite-baryte orefields of the English Pennines and Mendip Hills, in Mineral Parageneses(Augustithis, S., ed.), Theophrastus, Athens, 179–211.Google Scholar
Ixer, R.A. (1990) Atlas of opaque and ore minerals in their associations. Open University Press, Milton Keynes, 208 pp.Google Scholar
Ixer, R.A. and Vaughan, D.J. (1993) Lead-zinc-fluorite- baryte deposits of the Pennines, North Wales and the Mendips. In: Mineralization in the British Isles(Pattrick, R.A. and Polya, D.A., eds.), Chapman and Hall, London, 355-18.Google Scholar
Ixer, R.A., Stanley, C.J. and Vaughan, D.J. (1979) Cobalt-nickel-iron-bearing sulpharsenides from the north of England. Mineral Mag., 43, 389–95.CrossRefGoogle Scholar
Phillips, R. and Smith, F.W. (1974) Structural ore controls and palaeocirculation in fluorite veins in the north Pennine orefield. In Proceedings of the 4th Symposium of the International Association of Genesis of Ore Deposits Varna, 3, 17–23.Google Scholar
Rankin, A.H. and Graham, M.J. (1988) Na, K and Li contents of mineralizing fluids in the Northern Pennine Orefield, England and their genetic significance. Trans. Inst. Mining and MetalL, 97, B99-107.Google Scholar
Vaughan, D.J. and Ixer, R.A. (1980) Studies of the sulphide mineralogy of north Pennine ores, and their contributions to genetic models. Trans. Inst. Mining MetalL, 89, B99-109.Google Scholar
Young, B., Styles, M.T. and Berridge, N.G. (1985) Niccolite-magnetite mineralisation from Upper Teesdale, North Pennines, Mineral Mag., 49, 555–9.CrossRefGoogle Scholar