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

Plot of (A) Zr and (B) Nb versus 104 x Ga/Al for basement
rocks from the field trip area, compared to Neoproterozoic
A-type granitoids from the central Appalachians. For moe detailed explanation, contact Richard Tollo at rtollo@gwu.edu Figure 7. Plot of (A) Zr and (B) Nb versus 104 × Ga/Al for basement rocks from the field trip area, compared to Neoproterozoic A-type granitoids from the central Appalachians (shaded field, 150 analyses from Tollo and Aleinikoff, 1996; Tollo and others, in press a). Diagrams modified after Whalen and others (1987). 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/fig7.html
For more information, contact Richard Tollo
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