The validity of pearce element ratio analysis in petrology: an example from the Uwekahuna laccolith,Hawaii |
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| Authors: | Thomas H Pearce Clifford R Stanley |
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| Institution: | (1) Department of Geological Sciences, Queen's University, K7L 3N6 Kingston, Ontario, Canada |
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| Abstract: | Chemical variation diagrams formed from ratios with a common denominator exhibit induced correlations which can obscure the
effects of true compositional variations. Nevertheless, important conclusions have been obtained using Pearce element ratio
(and isochron) diagrams, even though these diagrams are formed from axes ratios with a common denominator. In this paper,
we consider two approaches to mitigate the effects of induced correlation, and in doing so, demonstrate the validity of geochemical
analysis using diagrams formed from ratios with a common denominator. First, we propagate analytical error onto Pearce element
ratio diagrams to distinguish chemical variations associated with analytical error from chemical variations related to geological
processes. Second, we consider an alternative diagram formed from ratios with different denominators which does not exhibit
any induced correlation. We demonstrate both theoretically and by example that results produced using this diagram are identical
to those using diagrams with a common denominator. These two lines of evidence confirm that Pearce element ratio (and isochron)
diagrams are useful and valid tools in the analysis of geochemical variations. |
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