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Plots of SiO2 versus (A) TiO2, (B) FeOt (total iron expressed as FeO), and (C) CaO for basement rocks from the field trip area.For more detailed explanation, contact Richard Tollo at rtollo@gwu.edu    Plots of SiO2 versus (D) aluminum saturation index (A/CNK=molar Al2O3/(CaO+Na2O+K2O), (E) Na2O+K2O, and (F) FeOt/MgO for basement rocks from the field trip area. For more detailed explanation, contact Richard Tollo at rtollo@gwu.edu
Figure 5. Plots of SiO2 versus (A) TiO2, (B) FeOt (total iron expressed as FeO), (C) CaO, (D) aluminum saturation index (A/CNK=molar Al2O3/(CaO + Na2O + K2O), (E) Na2O + K2O, and (F) FeOt/MgO for basement rocks from the field trip area. Dashed line in A encloses field of igneous charnockites from Kilpatrick and Ellis (1992). Dashed line separating alkaline and subalkaline fields in E is from Irvine and Baragar (1971). Dashed line separating tholeiitic and calc-alkaline fields in F is from Miyashiro (1974). All data are expressed in weight percent. Symbols are the same as in figure 4.

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubs.usgs.gov /circ/2004/1264/html/trip2/fig5.html
For more information, contact Richard Tollo
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