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). |
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| 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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:24, 30 September 2017 | | 411 × 307 (10 KB) | Mikhail Ryazanov | {{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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