Abstract
IN a previous article by two of us1 it was suggested that a belt of diabasic rocks south of Isachsen in the Canadian Arctic Archipelago appeared to be of Cretaceous age on the basis of its palaeomagnetism. On the other hand, whole rock potassium/argon age determinations on two of the samples studied (1–A and 10–B) indicated a Permian age (241 and 249 m.y.), in conflict with the palaeomagnetic data. No reasonable explanation for this incompatibility could be advanced at the time and, since then, one of us (R. K. W.) has re-determined the age of one of the samples (10–B), using a mass spectrometer with higher sensitivity than was used in the original determinations. Another sample (9–B) was sent to the Isotope Branch laboratories, U.S. Geological Survey, and a third one (9–A) was split and one half of it was sent to Dr. N. J. Snelling at the University of Oxford, while the other half was dated in the laboratories of the Geological Survey of Canada with the new high-sensitivity instrument. The ages obtained in these four whole rock determinations are listed in Table 1.
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References
Larochelle, A., and Black, R. F., Nature, 198, 1260 (1963).
Snelling, N. J. (personal communication).
Goldich, S. S. (personal communication).
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LAROCHELLE, A., BLACK, R. & WANLESS, R. Palaeomagnetism of the Isachsen Diabasic Rocks. Nature 208, 179 (1965). https://doi.org/10.1038/208179a0
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DOI: https://doi.org/10.1038/208179a0
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