On the use of 3-dimensional plots in KAr dating |
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| Authors: | AE Mussett AG McCormack |
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| Institution: | Sub-department of Geophysics, Oliver Lodge Laboratory, Oxford Street, Liverpool L69 3BX, U.K. |
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| Abstract: | 3-Dimensional correlation diagrams have advantages over 2-dimensional ones (‘isochrons’) for interpreting the results of KAr measurements on suites of coeval samples, since they display all the data without making a priori assumptions. This is a particular advantage for distinguishing between ‘initial’ argon of constant isotopic composition and ‘excess’ argon of constant concentration, because at present their detection has relied upon separate diagrams constructed upon mutually exclusive assumptions.The method also permits the relationships between the various models in use to be more easily grasped but—like all such plots—can only show that a given physical model is consistent with the data, not that it is the only consistent one. |
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