Diagramas

CLASSIFICATION PLOTS
Menu item AFM (Irvine + Baragar 1971) SiO2 - FeOt/MgO (Miyashiro 1974) SiO2 - K2O (Peccerillo + Taylor 1976) Co – Th (Hastie et al. 2007) A/CNK - A/NK (Shand 1943) Module name AFM Miyashiro PeceTaylor Hastie Shand Scope1 G G G G G Plot description (Na2O+K2O) – FeOt – MgO ternary SiO2 vs. FeOt /MgO binary SiO2 vs. K2O binary Co vs. Th Al2O3/(CaO+Na2O+K2O) vs. Al2O3/(Na2O+K2O)(mol. %) Details (reference) AFM plot that serves to discriminate between calc-alkaline and tholeiitic subalkaline series (Irvine & Baragar, 1971). Diagram of Miyashiro (1974) distinguishing between tholeiitic and calc-alkaline igneous rocks. Diagram proposed by Peccerillo & Taylor (1976) to distinguish various series of tholeiitic, calc-alkaline and shoshonitic rocks. Replacement for theprevious plot of Peccerillo & Taylor (1976) using less mobile elements, designed by Hastie et al. (2007). Classic A/CNK vs A/NK plot of Shand (1943) discriminating metaluminous, peraluminous and peralkaline compositions. The principal variation of the TAS diagram, as proposed by Le Bas et al. (1986) and codified by Le Maitre (1989). Dividing line between alkaline and subalkaline series is that of Irvine& Baragar (1971). Variation of the TAS diagram proposed by Cox et al. (1979) and adopted by Wilson (1989) for plutonic rocks. Variation of the TAS diagram proposed by Middlemost (1994). Ternary plot of Jensen (1976). Multicationic classification plot of De La Roche et al. (1980) (R1: 4Si - 11(Na + K) – 2(Fe + Ti); R2: 6Ca + 2Mg + Al).

TAS (Le Bas et al. 1986)

TAS CoxVolc CoxPlutTASMiddlemostVolc TASMiddlemostPlut Jensen LarocheVolc LarochePlut WinFloyd1

V V P V P V V P

SiO2 vs. (Na2O + K2O) binary

TAS (Cox et al. 1979) TAS (Middlemost 1994) Jensen (1976) R1-R2 (De la Roche et al. 1980) Nb/Y - Zr/TiO2 (Winchester + Floyd 1977) Zr/TiO2 - SiO2 (Winchester + Floyd 1977) Nb/Y - Zr/Ti (modified by Pearce 1996) QAPF diagram (Streckeisen 1978) QAPF diagram (Streckeisen 1974)
1SiO2 vs. (Na2O + K2O) binary SiO2 vs. (Na2O + K2O) binary Al – (Fet + Ti) – Mg ternary R1–R2 binary (in millications). log Nb/Y vs. log Zr/TiO2 log Zr/TiO2 vs. SiO2 binary

V WinFloyd2

Diagrams proposed by Winchester & Floyd (1977) for classification of volcanic rocks using incompatible element ratios.

Pearce1996 QAPFVolc QAPFPlut

V V P

log Nb/Y vs. log Zr/Ti QAPF – modalcompositions QAPF – modal compositions

The log Nb/Y vs. log Zr/TiO2 plot of Winchester & Floyd (1977) modified by Pearce (1996). Modal QAPF diagram of Streckeisen (1978) Modal QAPF diagram of Streckeisen (1974)

Scope: G: general diagram, V: designed for volcanic rocks, P: designed for plutonic rocks

CLASSIFICATION PLOTS (CONTD.)
Menu item Feldspar triangle (OConnor 1965) Module name OConnorVolcOConnorPlut DebonPQ DebonBA Villaseca MiddlemostPlut Scope1 V P P P P P Plot description Ternary plot Ab-An-Or P–Q binary (in millications) B–A binary (in millications) B–A binary (in millications) SiO2 vs. (Na2O + K2O) binary Details (reference) Classification diagram after O’Connor (1965) for silica-rich rocks (quartz > 10 %). It is based on CIPW-normative (volcanic, plutonic rocks) or modal(plutonic rocks) contents of albite, anorthite and K-feldspar. Nomenclature diagram of Debon & Le Fort (1983). Its coordinates correspond to proportions of Kfs and Pl to Qtz (P: K - (Na + Ca), Q: Si/3 - (K + Na + 2Ca/3)). The B–A diagram (Debon & Le Fort 1983) defines six sectors (I - VI), reflecting alumina balance of samples (B: Fe + Mg + Ti, A: Al - (K + Na + 2Ca)). The B–A diagram (Debon & Le Fort1983) with fields of various types of peralkaline rocks as outlined by Villaseca et al. (1998) Classification diagram of Middlemost (1985) for plutonic rocks.

P-Q (Debon + Le Fort 1983) B-A (Debon + Le Fort 1983) B-A (modified by Villaseca et al. 1998) Middlemost (1985)
1

Scope: G: general diagram, V: volcanic rocks, P: plutonic rocks

GEOTECTONIC PLOTS
Menu item Batchelor + Bowden...