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Significance of the cumulate mineralogy of the Belhelvie mafic-ultramafic intrusion—comments on: Silicate mineralogy of the Belhelvie cumulates, NE Scotland, by W. J. Wadsworth

Published online by Cambridge University Press:  05 July 2018

R. Boyd  and
W. A. Ashcroft
R. Boyd
Affiliation:
Geological Survey of Norway, P.O. Box 3006, N-7002 Trondheim, Norway
W. A. Ashcroft
Affiliation:
Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen AB9 2UE, Scotland
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Abstract

New data on the composition of cumulus phases in the Belhelvie intrusion presented by Wadsworth (1991) are discussed in the light of existing data and of knowledge on the form and internal structure of the intrusion. The relevance of the Rustenburg Layered suite of the Bushveld Complex as a model for the 'single intrusion' hypothesis for the layered basic intrusions in NE Scotland is examined: current knowledge of the Rustenburg Layered Suite and related intrusions suggests that similar crystallisation sequences of cumulus phases and ranges of cryptic variation do not give any case for a single intrusion hypothesis.

Keywords

cryptic variationcumulatesBelhelvieScotland
Type
The Hallimond Lecture
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 329 - 333
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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References

Alapieti, T. (1982) The Koillismaa layered igneous complex, Finland—its structure, mineralogy and geochemistry, with emphasis on the distribution of chromium. Geol. Surv. Finland Bull., 319, 116 pp.Google Scholar
Alapieti, T. Fildn, B.A., Lahtinen, J.J., Lavrov, M.M., Smolkin, V.F., and Voitsekhovsky, S.N. (1990) Early Proterozoic layered intrusions in the north-eastern part of the Fennoscandian Shield. Mineral. Petrol., 42, 1–22.CrossRefGoogle Scholar
Ashcroft, W.A. and Boyd, R. (1976) The Belhelvie mafic igneous intrusion, Aberdeenshire—a re-investigation. Scott. J. GeoL, 12, 1–14.CrossRefGoogle Scholar
Ashcroft, W.A. and Boyd, R. and Munro, M. (1978) The structure of the eastern part of the Insch marie intrusion, Aberdeenshire. Ibid. 14, 55-79.Google Scholar
Ashcroft, W.A. and Boyd, R. Kneller, B.C., Leslie, A.G. and Munro, M. (1984) Major shear zones and autochthonous Dalradian in the north-east Scottish Caledonides. Nature, 310, 760–2.CrossRefGoogle Scholar
Boyd, R. (1972) The geology of the Belhelvie mafic intrusion and its environs. Unpubl. Ph.D. thesis, Univ. of Aberdeen.Google Scholar
Boyd, R. and Munro, M. (1978) Deformation of the Belhelvie mass, Aberdeenshire. Scott. J. Geol., 14, 2944.CrossRefGoogle Scholar
Cousins, C.A. (1959) The structure of the mafic portion of the Bushveld igneous Complex. Trans. Geol. Soc. S. Aft., 62, 179–201.Google Scholar
Eales, H.V., Field, M., de Klerk, W.J., and Scoon, R.N. (1988) Regional trends of chemical variation and thermal erosion in the Upper Critical zone, Western Bushveld Complex. Mineral. Mag., 52, 63–79.CrossRefGoogle Scholar
Gould, D., Rathbone, P.A., Kimbell, G.S., and Burley, A.J. (1986) The Malopo Farms Complex, Botswana—a possible target for Bushveld-type mineralisation? In Metallogeny of basic and ultrabasic rocks (Gallagher, M. J., Ixer, R. A., Neary, C. R. and Pritchard, FI. M., eds.) Inst. Mining Metall., 319-32.Google Scholar
Institute of Geological Sciences (1968) Aeromagnetic map of part of Great Britain and Northern Ireland. Google Scholar
Irvine, T.N. and Sharpe, M.R. (1982) Source-rock compositions and depths of origin of Bushveld and Stillwater magmas. Carnegie Inst. Washington Yearb., 81, 294–303.Google Scholar
Irvine, T.N. and Sharpe, M.R. Keith, D.W. and Todd, S.G. (1983) The J-M platinum-palladium reef of the Stillwater Complex, Montana: II. Origin by double-diffusive convective magma mixing and implications for the Bushveld Complex. Econ. Geol., 78, 1287–335.CrossRefGoogle Scholar
Munro, M., (1986) Geology of the country around Aberdeen. Mem. Brit. Geol. Surv., Sheet 77 (Scotland), 124pp.Google Scholar
Read, H.H. (1923) The petrology of the Arnage district in Aberdeenshire. Q. J. Geol. Soc. London, 79, 446–84.CrossRefGoogle Scholar
Read, H.H. and Farquhar, O.C. (1956) The Buchan anticline of the Banff Nappe of Dalradian rocks in north-east Scotland. Ibid., 112, 131-54.Google Scholar
Sharpe, M.R. (1981) The chronology of magma influxes to the eastern compartment of the Bushveld Complex as exemplified by its marginal border groups. J. Geol. Soc. London, 138, 307–26.CrossRefGoogle Scholar
Sharpe, M.R. and Irvine, T.N. (1983) Melting relations of two Bushveld chilled margin rocks and implication of the origin of chromitite. Carnegie Inst. Washington Yearb., 82, 295–300.Google Scholar
Sharpe, M.R. Bahat, D., and von Gruenewaldt, G. (1981) The concentric elliptical structure of feeder sites to the Bushveld Complex and possible economic impli-cations. Trans. Geol. Soc. S. Afr., 84, 239–44.Google Scholar
Stewart, (1946) The gabbroie complex of Belhelvie in Aberdeenshire. Q. J. Geol. Soc. London, 102, 464–98.CrossRefGoogle Scholar
Stewart, and Johnson, M.R.W. (1960) The structural problems of the younger gabbros of north-east Scotland. Trans. Edinb. Geol. Soc., 18, 104–12.CrossRefGoogle Scholar
Todd, S.G., Keith, D.W., Le Roy, L.W., Schissel, D.J., Mann, E.L., and Irvine, T.N. (1982) The J-M platinum-palladium reef of the Stillwater Complex, Montana: I. Stratigraphy and petrology. Econ. Geol., 77, 1454–80.CrossRefGoogle Scholar
Vermaak, C.F. (1976) The Merensky Reef-thoughts on its environment and genesis. Ibid., 71, 1270-98.Google Scholar
Von Gruenewaldt, G. (1979) A review of some recent concepts of the Bushveld complex, with particular reference tosulfide mineralisation. Can. Mineral., 17, 233–56.Google Scholar
Von Gruenewaldt, G. Sharp, M.R. and Hatton, C.J. (1985) The Bushveld complex: Introduction and review. Econ. Geol., 80, 803–12.CrossRefGoogle Scholar
Von Gruenewaldt, G. Behr, S.H. and Wilhelm, H.J. (1989) Some preliminary petrological investigations of the Malopo Farms Complex, Botswana, and its Ni-Cu sulphide mineralisation. In Magmatic sulphides-—the Zimbabwe Volume (Prendergast, M. D. and Jones, M. J. eds.) Inst. Mining Metall., 95-106.Google Scholar
Wadsworth, W.J. (1970) The Aberdeenshire layered intrusion of north-east Scotland. In Symposium onthe Bushveld igneous complex and other layered intrusions (Visser, D. J. L. and von Grunewaldt, G. eds.), Geol. Soc. S. Afr. Special Publication, 1, 566–75.Google Scholar
Wadsworth, W.J. Stewart, F.H. and Rothstein, A.T.V. (1966) Cryptic layering in the Belhelvie intrusion, Aber-deenshire. Scott. J. Geol., 2, 54–66.CrossRefGoogle Scholar
Wadsworth, W.J. (1991) Silicate mineralogy of the Belhelvie cumulates, NE Scotland. Mineral. Mag., 55, 113–19.CrossRefGoogle Scholar
Willemse, J. (1969) The geology of the Bushveld Complex, the largest repository of magmatic ore deposits in the world. In Magmatic ore deposits (Wilson, H. D. B. ed.), Econ. geol. Monograph, 4, 1–22.Google Scholar
Wilson, A.H. and Prendergast, M.D. (1989) The Great Dyke of Zimbabwe—I: tectonic setting, petrology, structure, emplacement and crystallisation. In Magmatic sulphides—the Zimbabwe Volume (Prendergast, M. D. and Jones, M. J. eds.) Inst. Mining Metall., 1-21.Google Scholar
Wilson, J.R. and Larsen, S.B. (1985) Two-dimensional study of a layered intrusion—the Hyllingen Series, Norway. Geol. Mag., 122, 9.124.CrossRefGoogle Scholar