J.E. Quick, S. Sinigoi, G. Peressini, G. Demarchi, J.L. Wooden, A. Sbisà; Magmatic plumbing of a large Permian caldera exposed to a depth of 25 km. Geology ; 37 (7): 603–606. doi: https://doi.org/10.1130/G30003A.1
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We report evidence for a ≥13-km-diameter Permian caldera associated with a renowned section through the continental crust comprising the Ivrea-Verbano Zone and Serie dei Laghi of northwest Italy. Correlation of ages of volcanic and middle to deep crustal plutonic rocks suggests that they constitute an unprecedented exposure of a subcaldera magmatic plumbing system to a depth of 25 km, and points to a cause and effect link between intrusion of mantle-derived basalt in the deep crust, and large-scale, silicic volcanism.