Cadmium in Minerals from the Skaergaard Intrusion - A Further Study

Authors

  • C. B. Dissanayake
     Department of Geology, University of Sri Lanka, Peradeniya

Abstract

Cd has been determined in a suite of rocks and minerals from the Skaergaard intrusion, east Greenland by f1ameless atomic absorption spectrophotometry with the heated graphite atomizer. Cd is progressively enriched in the ultimate residual magmatic fractions. Among the minerals studied, Cd shows a distinct preference for ironrich pyroxene, olivine and titaniferous magnetite.

A study of the mode of entry of Cd into the minerals as discussed in terms of the number of Cd2+ ions per appropriate structural site reveals that despite the similarity of the ionic radius of Cd2+ and Ca2+ in octahedral co-ordination, Cd2+ ions appear to substitute more for Fe2+ in octahedral positions. It has been found that Cd enters octahedral sites in olivine, pyroxene and magnetite in approximately equal amounts. The poor entry of Cd2+ ions into the Fe2+ site of ilmenite is attributed to its highly distorted octahedral nature in addition to the presence of Fe2+ ions in the lattice.

Downloads

Download data is not yet available.

Issue

Volume 17, Issue 3, September 1976

Section

Research Papers

Downloads

Published

1976-09-01

How to Cite

Dissanayake, C. B. (1976). Cadmium in Minerals from the Skaergaard Intrusion - A Further Study. Journal of Geological Society of India, 17(3), 332–339. Retrieved from https://geosocindia.com/index.php/jgsi/article/view/63889

References

BREHLER, B., (1972) Cadmium. In Handbook of Geochemistry, Ed. K. H. Wedepohl, v, II-2, Chap. 48, pp. 35, Springer-Verlag, Berlin.

CHEVALLIER, R., MATHIEU, S. and VINCENT, E. A., (1954) Iron-titanium oxide minerals in layered gabbros of the Skaergaard Intrusion, East Greenland, Part 2, Magnetic properties, Geochim, Cosmochim. Acta, v. 6, pp. 27-34.

ESSON, J., STEVENS, R. H. and VINCENT, E. A., (1965) Aspects of the geochemistry of arsenic and antimony, exemplified by the Skaergaard Intrusion. Min. Mag., v. 35, pp, 88-107.

FLANAGAN, F. J., (1973) 1972 values for international geochemical reference samples. Geochim, Cosmochim. Acta., v, 37, pp, 1189-1200.

GOLDSCHMIDT, V. M., (1954) Geochemistry. Oxford Univ., London, 720.

IVANOV, V. V., (1961) Geochemistry of cadmium in the deposits of the Deputatskoye group. Geochemistry (English translation), no. 2, p. 168.

RANKAMA, K. and SAHAMA, T. G., (1961) Geochemistry, University of Chicago Press.

VINCENT, E. A. and BILEFIELD, L. I., (1960) Cadmiumin rocks and minerals from the Skaergaard Intrusion, East Greenland, Geochim. Cosmochim. Acta, v. 19, pp. 63-69.

WAGER, L. R. and BROWN, G. M., (1968) Layered Igneous Rocks. Oliver and Boyd., Edinburgh and London, pp. 588.

WAGER, L. R. and MITCHELL, R. L., (1951) The distribution of trace elements during strong fractionation of basic magma-a further study of the Skaergaard Intrusion, East Greenland. Geochim. Cosmochim. Acta, v, 1, pp. 129-208.

WAKITA, H., (1970) Cadmium. In Handbook of Geochemistry (Editor, K. H. Wedepohl), v. II-2, Chap. 48, Springer-Verlag, Berlin.

WHITTAKER, E. J. W. and MUNTUS, R., (1970) Ionic radii for use in geochemistry. Geochim, Cosmochim, Acta, v. 34, pp. 945-956.