Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-24T17:05:43.307Z Has data issue: false hasContentIssue false
  • English
  • Français

Some Effects of Artificial Heating on Fluorite-Bearing Albite-Granite from St. Austell, Cornwall

Published online by Cambridge University Press:  01 May 2009

J. H. Weymouth  and
W. O. Williamson
J. H. Weymouth
Affiliation:
C.S.I.R.O., G.P.O. Box 4331, Melbourne, Australia.
W. O. Williamson
Affiliation:
C.S.I.R.O., G.P.O. Box 4331, Melbourne, Australia.
Get access Rights & Permissions [Opens in a new window]

Abstract

The granite consisted chiefly of albite, quartz, muscovite, microperthite, fluorite, and topaz; zircon was very rare. The low to high quartz transition enhanced thermal expansion and porosity. Heating was continued step-wise to 1,300°C. and caused an irreversible increase in porosity at all temperatures investigated. The changes undergone by the various minerals, separately or through interaction, were noted. Fluorite began to melt against muscovite or alkali-feldspar between 800° and 900°C. Muscovite developed brownish pleochroism at the lower, and was replaced by mullite at the higher, temperatures. The gradual melting of feldspar, the development of cleavages and cracks in quartz, and the invasion of these cracks by feldspathic glass resembled phenomena in certain xenoliths.

The conditions that produced glass when powdered granite was heated unconfined or in a bomb are described.

Type
Articles
Information
Geological Magazine , Volume 94 , Issue 1 , February 1957 , pp. 69 - 80
Copyright
Copyright © Cambridge University Press 1957

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bååk, T., 1954. The system CaO-CaF2. Acta Chem. Scand., viii, 1727.CrossRefGoogle Scholar
Baak, T. and Ölander, A., 1955. The system CaSiO3-CaF2. Acta Chem. Scand., ix, 1350–1354.CrossRefGoogle Scholar
Bennett, A., Dawson, A., Wooliscroft, J. W., and Webb, H. W., 1941. The bloating and blistering of Cornish stone. Trans. Brit. Ceram. Soc., xl, 14–32.Google Scholar
Bradley, R. S., Schroeder, F. W., and Keller, W. D., 1940. Study of the refractory properties of topaz. Journ. Amer. Ceram. Soc., xxiii, 265–270.CrossRefGoogle Scholar
Brammall, A., and Harwood, H. F., 1932. The Dartmoor granites: their genetic relationships. Quart. Journ. Geol. Soc., lxxxviii, 171–237.CrossRefGoogle Scholar
Dale, A. J., and Francis, M., 1943. The biscuit-firing schedule for ceramic goods. Trans. Brit. Ceram. Soc., xlii, 42–56.Google Scholar
Day, A. L., and Allen, E. T., 1905. The isomorphism and thermal properties of the feldspars, Part I, thermal study. Carnegie Institute Washington Publ. No. 31.Google Scholar
Day, A. L., Sosman, R. B., and Hostetter, J. C., 1914. The determination of mineral and rock densities at high temperatures. Amer. Journ. Sci., xxxvii, 1–39.CrossRefGoogle Scholar
Goranson, R. W., 1932. Some notes on the melting of granite. Amer. Journ. Sci., xxiii, 227–236.CrossRefGoogle Scholar
Hall, T. C. F., 1914. The petrology of the St. Austell granite. Proc. Geol. Assoc., xxv, 180–192.CrossRefGoogle Scholar
Harker, A., 1950. Metamorphism. 3rd Edn. Methuen and Co., Ltd., London.Google Scholar
Hatch, F. H., Wells, A. K., and Wells, M. K., 1952. The Petrology of the Igneous Rocks, 10th Edn., Thomas Murby and Co., London.Google Scholar
Hawkes, L., 1929. On a partially fused quartz-feldspar-rock and on glomerogranular texture. Miner. Mag., xxii, 163–173.Google Scholar
Hedvall, J. A., and Carlander, O., 1952. Some contributions to the question of crystallographic transition and crystal cracking. Arkiv Kemi, iv, 389–400.Google Scholar
Hitchen, C. S., 1934. The Skiddaw granite and its residual products. Quart. Journ. Geol. Soc., xc, 158–200.Google Scholar
Holmes, A., 1936. Transfusion of quartz xenoliths in alkali basic and ultrabasic lavas, south-west Uganda. Miner. Mag., xxiv, 408–421.Google Scholar
Holmes, A., and Harwood, H. F., 1932. Petrology of the volcanic fields east and south-east of Ruwenzori, Uganda. Quart. Journ. Geol. Soc., lxxxviii, 370–442.CrossRefGoogle Scholar
Keeling, P. S., 1954. Cornish stone: a method of quantitative mineralogical analysis. Trans. Brit. Ceram. Soc., liii, 67–75.Google Scholar
Lacroix, A., 1893. Les enclaves des roches volcaniques. Protat Frères, Macon.Google Scholar
McCreary, W. J., 1955. The partial phase diagram of the system CaI2-CaF2. Journ. Amer. Chem. Soc., lxxvii, 2113–2114.CrossRefGoogle Scholar
Poldervaart, A., and Gilkey, A. K., 1954. On clouded plagioclase. Amer. Miner., xxxix, 75–91.Google Scholar
Richardson, W. A., 1923. A micrometric study of the St. Austell granite (Cornwall). Quart. Journ. Geol. Soc., lxxix, 546–576.CrossRefGoogle Scholar
Schairer, J. F., and Bowen, N. L., 1955. The system K2O-Al2O3-SiO2. Amer. Journ. Sci., ccliii, 681–746.CrossRefGoogle Scholar
Smith, H. G., 1933. Some lamprophyres of the Channel Islands. Proc. Geol. Assoc., xliv, 121–130.CrossRefGoogle Scholar
Stevens, R., 1954. Quartzite xenoliths in the Tertiary magmas of the Southern Highlands, N.S.W. J. Roy. Soc. New South Wales, lxxxviii, 89–96.Google Scholar
Sundius, N., and Byström, A. M., 1953. Decomposition products of muscovite at temperatures between 1,000° and 1,260° C. Trans. Brit. Ceram. Soc., lii, 632–642.Google Scholar
Turner, F. J., 1948. Mineralogical and structural evolution of the metamorphic rocks. Geol. Soc. Amer., Mem. xxx.Google Scholar
Weymouth, J. H., and Williamson, W. O., 1953. Some observations on the micro-structure of fired earthenware. Trans. Brit. Ceram. Soc., lii, 311–328.Google Scholar
Williams, G. J., 1934. A granite-schist contact in Stewart Island, New Zealand, Quart. Journ. Geol. Soc., xc, 322–353.CrossRefGoogle Scholar
Williamson, W. O., 1935. The composite gneiss and contaminated granodiorite of Glen Shee, Perthshire. Quart. Journ. Geol. Soc., xci, 382–422.CrossRefGoogle Scholar
Williamson, W. O., 1949. Ceramic products; their geological interest and analogies. Amer. Journ. Sci., ccxlvii, 715–749.CrossRefGoogle Scholar
Yoder, H. S., and Eugster, H. P., 1955. Synthetic and natural muscovites. Geochim. Cosmochim. Acta, viii, 225–280.CrossRefGoogle Scholar