On Estimating the Magnitude of the Hidden Zone and the Compositions of the Residual Liquids of the Skaergaard Layered Series |
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| Authors: | CHAYES FELIX |
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| Institution: | Geophysical Laboratory, Carnegie Institution of Washington Washington, D.C. 20008 |
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| Abstract: | Wager's more general assumptions about the relations betweenthe layered series of Skaergaard and its parent magma form thebasis for a simple procedure by which, from the compositionof the proposed initial magma and the compositions and amountsof the exposed zones, the amount and composition of the hiddenzone and the compositions of liquids remaining after the consolidationof each zone are readily computed. Application of the procedure to the Skaergaard data—moreproperly, to the relevant summary statistics presented by Wager(1960) and by Wager & Brown (1968)—suggests that currentlyaccepted graphical solutions materially overestimate the extentof end-stage alkali enrichment and may materially understatethe magnitude of the hidden zone; the data are quite as compatiblewith numerical solutions yielding a considerably larger hiddenzone and virtually no perceptible end-stage alkali enrichment.Differences between numerical and graphical solutions seem tobe generated primarily by the zone weights used in the latter. |
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