Magmatism in the Asunción-Sapucai-Villarrica Graben (Eastern Paraguay) Revisited: Petrological, Geophysical, Geochemical, and Geodynamic Inferences
Figure 5
Compositional variation of the rock-types from ASV in terms of (Na + K) − 2(Fe + Ti) and = 6Ca + Mg + Al [39] (also Figure 2 of [13]). Data source: [34]. SG, field of Serra Geral tholeiites; ASV, field of Na-alkaline rocks; B-P and AB-T, lineages of the K-alkaline rocks (basanite to phonolitic suite and alkaline basalt to trachyphonolite/trachyte suite, resp.; white squares represent a lava flow and a theralite with carbonatitic affinity, resp. (see text)). Insets: (I), the same with subdivision into intrusive and volcanic rocks and dykes, plus Le Maitre [40] classification, as in Figure 2 of [10]. (II), QAPF diagram [41] for intrusive potassic suites from ASV, as from Figure 3 of [10]. (III), Azimutal frequence of the B-P and AB-T dykes [42]. The symbols represent selected compositions as in Tables 1 to 4.
