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Fig. 3 | Swiss Journal of Geosciences

Fig. 3

From: Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 2. The Biella Volcanic Suite

Fig. 3

Bulk chemical analyses of the rocks of the BVS, volcanic dykes and Miagliano Pluton compared with data of Callegari et al. (2004) and data of the Valle del Cervo Pluton (Bigioggero et al. 1994) and Traversella Pluton (Van Marcke de Lumen and Vander Auwera 1990). a Zr–P2O5 diagram showing the distribution of our samples of volcanic rocks in relation with the data of Callegari et al. (2004) and with the data from the plutonic rocks (Valle del Cervo Pluton, Miagliano Pluton and Traversella Pluton). b Zr–K2O plot illustrating the strong effect of alteration on K2O by nearly unchanged Zr concentration. c Na2O–K2O plot showing contrasting enrichment/depletion behaviour of samples with similar primary composition. d Total alkali silica (TAS) diagram illustrating the effect of antithetic enrichments on the nomenclature of volcanic rocks

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