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Summary

Description
English: This diagram shows the position of the trachyte field in the total alkali-silica (TAS) diagram for classifying extrusive igneous rock. Trachyte is high in silica and alkali metals and is the usual end member of the alkali magma series, with differentiation proceeding to phonolite only rarely.
Date
Source Own work
Author Kent G. Budge

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TAS diagram with trachyte field highlighted

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23 September 2020

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Date/TimeThumbnailDimensionsUserComment
current 21:10, 23 September 2020 Thumbnail for version as of 21:10, 23 September 2020740 × 650 (35 KB)Kent G. BudgeUploaded own work with UploadWizard
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