U.S. Geological Survey: Science for a Changing World - USGS visual identifier and link to main Web site at http://www.usgs.gov/

Major-element chemical classification based on Na2O + K2O against SiO2, based on the method of Le Bas and others (1986). For a more detailed explanation, contact Jonathan Tso at jtso@radford.edu.
 
Figure 2. Major-element chemical classification based on Na2O + K2O against SiO2, based on the method of Le Bas and others (1986). The open circles are analyses from Southworth and others (1993), and the closed circles are from Tso and Surber (2002).
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip4/fig2.html
For more information, contact Jonathan Tso
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Last modified: 12:24:18 Wed 23 Nov 2016
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