fig18.htm

Figure 18. K-Ar evolution diagram.
Most samples approach the reference 370 Ma isochrone crossing atmospheric 40Ar/36Ar ratio. However several samples from the Kovdor and Vuoriyarvi Complexes are well above the isochrone implying trapped Ar with initial 40Ar/36Ar ~4,000. Samples having low K/ 36Ar ratios (inset) also show occurrence of excess trapped Ar with 40Ar/36Ar ge 3,000. Host rocks of the dyke Complex are not considered because of their older age.


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