Rock classification
An-Ab-Or diagram for tonalite, trondhmemite, granodiorite, granite.
SiO2 vs. K2O for volcanic rocks.
SiO2 vs. Na2O+K2O for volcanic rocks.
Q - Af - Pf diagram for classification of felsic and intermediate plutonic rocks.
Immobile trace elements and SiO2 classification for igneous rocks, especially volcanics.
Rock series discriminants
Alkali-lime index vs. SiO2, defining calc-alkaline andesites from "normal" arc suites compared to more and less mature arc suites.
Tholeiitic vs. alkaline series in oceanic and continental settings (not arcs).
Feldspathic igneous rock series (ferroan, magnesian, aluminous, alkaline, etc.).
Arc series: tholeiitic, calc-alkaline, and more alkaline series, and basaltic, andesitic, and rhyolitic compositions.
Tholeiitic vs. calc-alkaline series discriminants.
SiO2 vs. FeOtotal/MgO discriminant for arc tholeiites vs. arc calc-alkaline series.
Discriminants for arc tholeiite vs. arc calc-alkaline series.
SiO2 vs. K2O calc-alkaline vs. tholeiitic series
Tectonic setting discriminants, mostly basaltic rocks
Nb - La - Y discriminant for arc, MORB/WP, and intermediate/contaminated rocks.
Ti-Zr discriminant for MORB, IAT, and boninites, modified after earlier workers.
Cr vs Y discriminant for MORB, IAT, and boninites, modified after earlier workers.
Discriminants for MORB, ocean island, and a variety of arc-type basalts
Y - Zr - Nb discriminant for arc, MORB, and within-plate basalts.
P2O5 - MnO - TiO2 discriminant for ocean island, MORB, arc basalts, and boninites.
Ti vs. Cr discriminant for ocean floor basalts vs. low-K arc tholeiites.
Zr - Ti discriminant for MORB, within-plate, and arc lavas. Apparently includes low-Ti lavas which are probably felsic.
Discriminants for mantle melting array vs. arc basalts.
Th - Ta - Yb discriminant for mantle melting array vs. arc basalts.
Immobile element discriminant for arc, within-plate, and ocean floor basalts.
Zr vs. Zr/Y discriminant for arc, ocean ridge, and within-plate basalts. Boninite added.
Ti - V discriminant diagram for tholeiitic to alkaline basalts, excluding calc-alkaline arc basalts. Boninite added.
Ta - Th - Hf discriminant for arc, MORB, and within-plate basalts.
Tectonic setting discriminants, mostly felsic rocks
Al2O3 vs Yb discriminant for oceanic vs. continental granitoids.
Y/Nb - Rb/Nb discriminant for A1 vs. A2-type anorogenic granites.
Th - Ta - Yb discriminants mostly for felsic to intermediate rocks.
Discriminant diagrams for granitic rocks.
Discriminates A-type granites from all other granite types.
- بازدید: 9056
