Summary
A brief argument is put forward to support the suggestion that dykes such as the members of the Pilandsberg and Tholeiite systems acquire their remanent magnetism in a period of the order of 1 to 10 years. This means that such dykes will cool from, say 550°C to 450°C in that time period.
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Manley, H. An estimate of the time taken for a dyke to cool through its curie point. Geofisica Pura e Applicata 27, 105–109 (1954). https://doi.org/10.1007/BF02033239
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DOI: https://doi.org/10.1007/BF02033239