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Evidence for the mechanism of the reaction producing a bournonite–galena symplectite from meneghinite

Published online by Cambridge University Press:  05 July 2018

Ni Wen ,
J. R. Ashworth  and
R. A. Ixer
Ni Wen
Affiliation:
School of Earth Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
J. R. Ashworth
Affiliation:
School of Earth Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
R. A. Ixer
Affiliation:
School of Earth Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Abstract

In vein material from the abandoned copper mine at Dhurode, County Cork, Republic of Ireland, the sulphosalt meneghinite is partly replaced by later minerals, notably a symplectite of galena and bournonite. Mineral analyses and proportions indicate that the bulk Pb/Sb ratio in the symplectite is almost identical to that of the meneghinite. It is inferred that Pb and Sb were the relatively immobile elements whose short-range segregation controlled the scale of symplectite intergrowth, during a diffusive replacement reaction in which Cu and S were added from the vein-forming fluid. This is the second sulphosalt-bearing symplectite for which immobile elements have been identified. In both cases, the inferred replacement reaction causes a volume increase, approximately 15% in the present example.

Keywords

symplectitemeneghinitebournonitereplacementIreland
Type
Mineralogy and Geochemistry
Information
Mineralogical Magazine , Volume 55 , Issue 379 , June 1991 , pp. 153 - 158
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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References

Ashworth, J. R. (1986) Myrmekite replacing albite in prograde metamorphism. Am. Mineral., 71, 895–9.Google Scholar
Ashworth, J. R. and Birdi, J. J. (1990) Diffusion modelling of coronas around olivine in an open system. Geochim. Cosmochim. Ada, 54, 2389–401.CrossRefGoogle Scholar
Bastin, E. S., Graton, L. C., Lindgren, W., Newhouse, W. H., Schwartz, G. M. and Short, M. N. (1931) Criteria of age relations of minerals. With especial reference to polished sections of ores. Econ. Geol, 26, 561–610.CrossRefGoogle Scholar
Birchenall, C. E. (1974) Diffusion in sulfides. In Geochemical transport and kinetics (Hofmann, A. W., Giletti, B. J., Yoder, H. S. Jr. and Yund, R. A., eds.), Carnegie Institution of Washington Publication 634, 53-\3.Google Scholar
Cowman, D. and Reilly, T. A. (1988) The abandoned mines of West Carbery. Promoters, adventurers, and miners. Geological Survey of Ireland, 177 pp.Google Scholar
Euler, R. and Hellner, E. (1960) Uber komplex zusammengesetzte sulfidische Erze VI. Zur Kristallstruktur des Meneghinits, CuPb13Sb7S24 . Zeits. Kristaltogr., 113, 345-72.CrossRefGoogle Scholar
Grant, J. A. (1986) The isocon diagram-a simple solution to Gresens’ equation for metasomatic alteration. Econ. Geol, 81, 1976-82.CrossRefGoogle Scholar
Hoda, S. N. and Chang, L. L. Y. (1975) Phase relations in the pseudo-ternary system PbS-Cu2S-Sb2S3 and the synthesis of meneghinite. Can. Mineral, 13, 388-93.Google Scholar
Ixer, R. A. (1990) Atlas of opaque and ore minerals in their associations. Open University Press, Milton Keynes, 208 pp.Google Scholar
Joint Committee on Powder Diffraction Standards (1980) Mineral powder diffraction file.Google Scholar
Makovicky, E. (1989) Modular classification of sulphosalts-current status. Definition and application of homologous series. Neues Jahrb. Mineral. Abh., 160, 269-97.Google Scholar
Moëlo, Y. Robert, J.-F., and Picot, P. (1988) Symplectite jamesonite-stibine de la mine d'anti-moine de Fecunda (district du Val de Ribes, Pyrénées catalanes). Bull. Minéral, 111, 451–5.CrossRefGoogle Scholar
Mongkoltip, P. and Ashworth, J. R. (1983) Quantitative estimation of an open-system symplectite-forming reaction: restricted diffusion of Al and Si in coronas around olivine. Petrol, 24, 635-61.CrossRefGoogle Scholar
Ramdohr, P. (1969) The ore minerals and their inter-growths. English 1st Ed. Pergamon, Oxford, 1174 pp.Google Scholar
Reilly, T. A. (1986) A review of vein mineralization in SW County Cork, Ireland. In Geology and genesis of mineral deposits in Ireland (Andrew, C. J., Crowe, R. W. A., Finlay, S., Pennell, W. M., and Pyne, J. F., eds.), Irish Association for Economic Geology, Dublin, 513-14.Google Scholar