Fig. 3: Major-element geochemistry plots for Late Cretaceous arc rocks in the coastal batholiths of the SCB and SNB (blue and black dots) versus peraluminous leucogranites of the Cordilleran anatectic belt (red dots).
From: Magmatic surge requires two-stage model for the Laramide orogeny

a AFM diagram. b Fe* vs. SiO2. c Modified alkali lime index vs. SiO2. d Major element compositional variation plot. In general, plots show that granitoids from the SCB overlap those of the SNB and arc melt inclusions (gray dots). Peraluminous leucogranites of the Cordilleran Anatectic Belt are geochemically distinct and unrelated to rocks in the coastal batholiths. Melt inclusion data are from the GEOROC database and SNB data are compiled from the NAVDAT database. Fields for Cordilleran granitoids after ref. 87. FeO* = FeO + (Fe2O3*0.8998). a alkali, ac alkali calcic, ca calc-alkalic, c calcic.