Chemistry of igneous rocks--[Part] 1, Differentiation index

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ID: 292526
1960
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Abstract
Recent experimental studies corroborate the evidence Bowen used in 1937 to demonstrate that fractional crystallization of complex magmas produces liquids which move toward and, for all practical purposes, eventually reach the system SiO 2 -NaAlSiO 4 -KAlSiO 4 , petrogeny9s residua system. In a volcanic rock series the distance a given magma has travelled toward this goal can be quantitatively measured by calculating the norm and summing the constituents of petrogeny9s residua system; this value is called the differentiation index. It is a useful coordinate for variation diagrams and is a measure of the "basicity" of a rock. A series of frequency distribution diagrams have been prepared from 3,000 analyses in Washington9s Tables. Using these diagrams, any rock analysis can be compared at a glance with all the analyses and any deviations from the "average" can readily be seen.
Reference Key
openalex_W2123157409 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Charles P. Thornton, O. F. Tuttle
Journal american journal of science
Year 1960
DOI
10.2475/ajs.258.9.664
URL
https://doi.org/10.2475/ajs.258.9.664
Keywords Keywords not found

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