On ′′spurious′′ correlations in Rb-Sr isochron diagrams

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doi: 10.1016/0024-4937(82)90013-5
Authors:Dodson, M. H.
Author Affiliations:Primary:
Univ., Dep. Earth Sci., Leeds LS2 9JT, United Kingdom
Volume Title:Lithos (Oslo)
Source:Lithos (Oslo), 15(3), p.215-219. Publisher: Elsevier, Amsterdam, International. ISSN: 0024-4937
Publication Date:1982
Note:In English. 16 refs.
Summary:A general null hypothesis for isotope geochemistry states that the isotopic composition of an element is independent of its concentration or any other geochemical property of the population. 'Spurious' correlations between the ratios 87Sr/86Sr and 87Rb/86Sr (or Rb/Sr), due to the common denominator effect (CDE), may be ruled out because they contradict this null hypothesis. Mixing processes may be regarded as geochemical counterparts of the CDE. In geochronological systems which satisfy the basic assumptions of the Rb/Sr isochron method, observed correlations between Sr-isotope abundance and Sr concentration must be secondary to the direct causal dependence of 87Sr/86Sr upon Rb/Sr ratios. [G.R.]
Subjects:Absolute age; Alkaline earth metals; Correlation coefficient; Geochemistry; Isochrons; Isotopes; Metals; Methods; Rb/Sr; Sr-87/Sr-86; Stable isotopes; Statistical analysis; Strontium
Abstract Numbers:83M/1002
Record ID:1983026615
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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