Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-17T18:09:37.056Z Has data issue: false hasContentIssue false
  • English
  • Français

The Hangnest Dolerite Sill, S.A

Published online by Cambridge University Press:  01 May 2009

F. Walker  and
A. Poldervaart
F. Walker
Affiliation:
Department of Mineralogy and Geology, University of Cape Town
A. Poldervaart
Affiliation:
Department of Mineralogy and Geology, University of Cape Town
Get access Rights & Permissions [Opens in a new window]

Extract

A 500 ft. sill of dolerite from Hangnest in the Calvinia division of the Cape Province (South Africa) exemplifies very clearly two well-marked features of the thicker Karroo sills:—

(1) Very slight amount of crystallization-differentiation.

(2) Marked tendency to mobilize and react with the associated shales and siltstones.

A petrological and chemical study of this sill is given and the mechanism of the various processes discussed.

Type
Articles
Information
Geological Magazine , Volume 78 , Issue 6 , December 1941 , pp. 429 - 450
Copyright
Copyright © Cambridge University Press 1941

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

Daly, R. A., and Barth, T. F. W., 1930. Dolerites associated with the Karroo System, South Africa. Geol. Mag., 67, 97–110.CrossRefGoogle Scholar
Deer, W. A., and Wager, L. R. 1938. Two new pyroxenes included in the system clinoenstatite, clinoferrosilite, and hedenbergite. Min. Mag., 25, 15–29.Google Scholar
Hess, H. H., and Phillips, A. H., 1940. Optical properties and chemical composition of magnesian orthopyroxenes. Am. Min., 25, 271–285.Google Scholar
Holmes, A., and Harwood, H. F., 1928. The age and composition of the Whin Sill and the related dikes of the north of England. Min. Mag., 21, 493–542.Google Scholar
Kuno, H., 1933. Preliminary Note on Basalt from Aziro, Idu. Earth. Res. Inst., 11, 392–7.Google Scholar
Lewis, J. V., 1907. Petrography of the Newark igneous rocks of New Jersey. N.J. Geol. Survey, Ann. Report for 1907, pp. 97–167.Google Scholar
MacGregor, A. G., 1931. Clouded feldspars and thermal metamorphism. Min. Mag., 22, No. 133, 524–538.Google Scholar
Mountain, E. D., 1936. Syntectic phenomena in Karroo dolerite at Coedmore quarries, Durban. Trans. Geol. Soc. South Africa, 38, 93–112.Google Scholar
Nel, H. J., 1940. The basal rocks of the Bushveld igneous complex, north of Pretoria. Trans. Geol. Soc. South Africa, 43, 43–68.Google Scholar
Phemister, T. C., 1934. The role of water in basaltic magma. Min. Petr. Mitt., Band 45, Heft 1, 1–19Google Scholar
Phemister, T. C., 1934. The role of water in basaltic magma. Min. Petr. Mitt., Heft 2, 99–133.CrossRefGoogle Scholar
Read, H. H., 1935. The gabbros and associated xenolithic complexes of the Haddo House district, Aberdeenshire. Quart. Journ. Geol. Soc., 91, 591–638.CrossRefGoogle Scholar
Scholtz, D. L., 1937. The magmatic nickeliferous ore deposits of East Griqualand and Pondoland. Trans. Geol. Soc. South Africa, 39, 81–209.Google Scholar
Walker, F., 1940. Differentiation of the Palisade diabase, New Jersey. Bull. Geol. Soc. Am., 51, 1059–1106.CrossRefGoogle Scholar
Walker, F. and Poldervaart, A., 1940. The petrology of the dolerite sill of Downes Mountain, Calvinia. Trans. Geol. Soc. South Africa, 43, 159–173.Google Scholar
Walker, F. 1941. The dolerites of the Calvinia district. Trans. Geol. Soc. South Africa, vol. 44.Google Scholar