Abstract
IN a previous investigation of the Pre-Cambrian dolerites of Eastern Rhodesia, McElhinny and Opdyke1 established on the basis of palaeomagnetic measurements that two distinct periods of igneous activity were represented. At one locality it appeared that the Mashonaland dolerites had intruded the Umkondo dolerites. On the basis of the evidence from this one site they suggested that the Umkondo dolerites were the older of the two sets of intrusions.
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References
McElhinny, M. W., and Opdyke, N. D., J. Geophys. Res., 69, 2465 (1964).
Swift, W. H., Southern Rhodesian Geol. Surv. Bull. No. 52, 17 (1962).
Gough, D. I., J. Geophys. Res., 69, 2455 (1964).
McElhinny, M. W., Geophys. J. (in the press).
Graham, K. W. T., and Hales, A. L., Phil. Mag., Suppl., 6, 149 (1957).
Nairn, A. E. M., Overseas Geol. and Mineral Resources, 9, 302 (1964).
Cox, A., and Doell, R. R., Bull. Geol. Soc. Amer., 71, 645 (1960).
McDougall, I., J. Geophys. Res., 68, 1535 (1963).
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MCELHINNY, M., JONES, D. Palaeomagnetic Measurements on some Karroo Dolerites from Rhodesia. Nature 206, 921–922 (1965). https://doi.org/10.1038/206921a0
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DOI: https://doi.org/10.1038/206921a0
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