File:Petrology Igneous.svg

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Description
English: Total alkali (Na2O + K2O) versus silica (SiO2), or TAS, classification system of igneous rocks. After Le Maitre (2002).
Date
Source W. C. Pat Shanks III and Ronald Thurston (editors), Volcanogenic Massive Sulfide Occurrence Model, US Dept. of the Interior, U.S. Geological Survey Scientific Investigations Report 2010-5070-C (2012). p. 237 (fig. 15–2 A)
Author W. Ian Ridley
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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current21:24, 30 September 2017Thumbnail for version as of 21:24, 30 September 2017411 × 307 (10 KB)Mikhail Ryazanov (talk | contribs){{Information |Description={{en|1=Total alkali (N<sub>2</sub>O + K<sub>2</sub>O) versus silica (SiO<sub>2</sub>), or TAS, classification system of igneous rocks. After Le Maitre (2002).}} |Source=[http://pubs.usgs.gov/sir/2010/5070/c/ W. C. Pat Shanks...

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