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The origin of cordierite—anthophllite rocks in the Land's End aureole

Published online by Cambridge University Press:  01 May 2009

G. A. Chinner  and
J. S. Fox
G. A. Chinner
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
J. S. Fox
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
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Summary

The prevalence of low-variance assemblages, the frequency of the buffered association anthophyllite—cordierite—cummingtonite—plagioclase, and the ubiquity of aluminium-rich clots of diaspore incompatible with the ortho-amphibole of the rock suggest that the cordierite—anthophyllite rocks of the Land's End aureole are not the product of metasomatism, but resulted from the thermal metamorphism of pre-existing rock-compositions. The origin of many kyanite-, amphibole- and cordierite-rich bodies by pre-metamorphic alteration is of economic significance in regions where such curious silicate assemblages accompany sulphide deposits.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 5 , September 1974 , pp. 397 - 408
Copyright
Copyright © Cambridge University Press 1974

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References

Cann, J. R. 1969. Spilites from the Carlsberg Ridge, Indian Ocean. J. Petrology 10, 1–19.CrossRefGoogle Scholar
Eskola, P. 1914. On the petrology of the Orijarvi region in south-western Finland. Bull. Comm. géol. Finlande 40.Google Scholar
Floyd, P. A. 1965. Metasomatic hornfelses of the Land's End aureole at Tater-du, Cornwall. J. Petrology 6, 223–45.CrossRefGoogle Scholar
Floyd, P. A. 1968. Distribution of Cu in the basic hornfelses of the Land's End aureole, and other chemically similar rocks. Geochim. cosmochim. Acta 32, 879–96.CrossRefGoogle Scholar
Gresens, R. L. 1972. Staurolite–quartzite bands in kyanite quartzite at Big Rock, Rio Arriba county, New Mexico – a discussion. Contr. Mineral. Petrol. 35, 193–99.CrossRefGoogle Scholar
Harker, A. 1939. Metamorphism. Methuen, London.Google Scholar
Robinson, P. & Jaffe, H. W. 1969. Aluminous enclaves in gedrite–cordierite gneiss from southwestern New Hampshire. Am. J. Sci. 267, 389–421.CrossRefGoogle Scholar
Robinson, P., Ross, M. & Jaffe, H. W. 1971. Composition of the anthophyllite–gedrite series, comparisons of gedrite and hornblende and the anthophyllite–gedrite solvus. Am. Miner. 56, 1005–41.Google Scholar
Rosen-Spence, A. de. 1969. Genèse des roches à cordierite–anthophyllite des gisements cupro-zincifères de la région de Rouyn—Noranda, Quebec, Canada. Can. J. Earth Sci. 6, 1339–44.CrossRefGoogle Scholar
Ross, M., Papike, J. J. & Shaw, K. W. 1969. Exsolution textures in amphiboles as indicators of subsolidus thermal histories. In Papike, J. J. (Ed.): Pyroxenes and Amphiboles. Spec. pap. Min. Soc. Am. 2, 275–99.Google Scholar
Schreyer, W. & Chinner, G. A. 1966. Staurolite-quartzite bands in kyanite quartzite at Big Rock, Rio Arriba county, New Mexico. Contr. Mineral. Petrol. 12, 223–44.CrossRefGoogle Scholar
Sears, G. W. 1961. The origin of spherulites. J. Phys. Chem. 65, 1738–41.CrossRefGoogle Scholar
Simmons, B. D. 1973. Geology of the Millenbach massive sulphide deposit, Noranda, Quebec. Can. Min. metall. Bull., November 1973, 67–78.Google Scholar
Sweatman, T. R. & Long, J. V. P. 1969. Quantitative electron-probe microanalysis of rock-forming minerals. J. Petrology 10, 332–79.CrossRefGoogle Scholar
Thompson, J. B. 1970. Geochemical reactions and open systems. Geochim. cosmochim. Acta 34, 529–51.CrossRefGoogle Scholar
Tilley, C. E. 1935. Metasomatism associated with the greenstone-hornfelses of Kenidjack and Botallack. Miner. Mag. 24, 181–202.Google Scholar
Tilley, C. E. & Flett, J. S. 1929. Hornfelses from Kenidjack. Geol. surv. G.B. summ. prog. part II, 24–41.Google Scholar
Vallance, T. G. 1967. Mafic rock alteration and isochemical development of some cordierite—anthophyllite rocks. J. Petrology 8, 84–96.CrossRefGoogle Scholar
Vallance, T. G. 1969. Spilites again. Proc. Linn. Soc. N.S.W. 94, 1–45.Google Scholar
Zen, E.-An. 1963. Components, phases and criteria of chemical equilibrium in rocks. Am. J. Sci. 261, 929–42.CrossRefGoogle Scholar
Ross, M., Papike, J. J. & Shaw, K. W. 1969. Exsolution textures in amphiboles as indicators of subsolidus thermal histories. In Papike, J. J. (Ed.): Pyroxenes and Amphiboles. Spec. pap. Min. Soc. Am. 2, 275–99.Google Scholar
Schreyer, W. & Chinner, G. A. 1966. Staurolite-quartzite bands in kyanite quartzite at Big Rock, Rio Arriba county, New Mexico. Contr. Mineral. Petrol. 12, 223–44.CrossRefGoogle Scholar
Sears, G. W. 1961. The origin of spherulites. J. Phys. Chem. 65, 1738–41.CrossRefGoogle Scholar
Simmons, B. D. 1973. Geology of the Millenbach massive sulphide deposit, Noranda, Quebec. Can. Min. metall. Bull., November 1973, 67–78.Google Scholar
Sweatman, T. R. & Long, J. V. P. 1969. Quantitative electron-probe microanalysis of rock-forming minerals. J. Petrology 10, 332–79.CrossRefGoogle Scholar
Thompson, J. B. 1970. Geochemical reactions and open systems. Geochim. cosmochim. Acta 34, 529–51.CrossRefGoogle Scholar
Tilley, C. E. 1935. Metasomatism associated with the greenstone-hornfelses of Kenidjack and Botallack. Miner. Mag. 24, 181–202.Google Scholar
Tilley, C. E. & Flett, J. S. 1929. Hornfelses from Kenidjack. Geol. surv. G.B. summ. prog. part II, 24–41.Google Scholar
Vallance, T. G. 1967. Mafic rock alteration and isochemical development of some cordierite-anthophyllite rocks. J. Petrology 8, 84–96.CrossRefGoogle Scholar
Vallance, T. G. 1969. Spilites again. Proc. Linn. Soc. N.S. W. 94, 1–45.Google Scholar
Zen, E.-An. 1963. Components, phases and criteria of chemical equilibrium in rocks. Am. J. Sci. 261, 929–42.CrossRefGoogle Scholar