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The Structure of the Marumbe Ring-Complex, Nuanetsi Igneous Province, Southern Rhodesia

Published online by Cambridge University Press:  01 May 2009

R. L. Johnson
R. L. Johnson
Affiliation:
Research Institute of African Geology, The University of Leeds.
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Abstract

The Marumbe complex is a small ring-intrusion consisting essentially of a plug of nordmarkite separated from the basalt country rocks by a later ring-dyke and roof-sheet of granite. The lower and upper surfaces of a screen of basalt, which lies between the top of the nordmarkite body and the base of the granite roof-sheet, correspond to successive horizontal fractures which permitted blocks limited by ring-fractures to subside as the nordmarkite and granite magmas were intruded. A series of sheets of granite are developed locally in the hanging-wall of the above-mentioned ring-dyke, and further granite ring-dykes cut the nordmarkite and the country rocks.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 3 , 22 June 1964 , pp. 274 - 281
Copyright
Copyright © Cambridge University Press 1964

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References

REFERENCES

Anderson, E. M., 1936. The dynamics of the formation of cone-sheets, ring-dykes, and cauldron-subsidences. Proc. roy. Soc. Edin., 61, 128.Google Scholar
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Cox, K. G., Johnson, R. L., Monkman, L. J., Stillman, C. J., Vail, J. R., and Wood, D. N. (In Press). The geology of the Nuanetsi Igneous Province. Phil. Trans. roy. Soc.Google Scholar