On the Representation of Igneous Rocks in Triangular Diagrams

descriptionPublicationkeyboard_double_arrow_right Article 01 Feb 1922 English Publisher:University of Chicago PressJournal:The Journal of Geology, volume 30, pages 167-169 (issn: 0022-1376, eissn: 1537-5269,

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Authors: Johannsen, Albert;

doi: 10.1086/622863

On the Representation of Igneous Rocks in Triangular Diagrams

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Abstract

It has been customary to represent three components in a triangular diagram by a dot, or four components by a triangle within the triangle. The writer, by means of only a dot and a line, plots without the use of a slide rule or any calculation whatsoever, the actual percentages of quartz, orthoclase, plagioclase, and dark minerals as well as the relative percentages of quartz, orthoclase, and plagioclase among the light constituents. Let it be required to plot a rock with the following mode:'

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