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Geology; July 2009; v. 37; no. 7; p. 603-606; DOI: 10.1130/G30003A.1
© 2009 Geological Society of America
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Magmatic plumbing of a large Permian caldera exposed to a depth of 25 km

J.E. Quick1, S. Sinigoi2, G. Peressini2, G. Demarchi2, J.L. Wooden3 and A. Sbisà2

1 Southern Methodist University, Dallas, Texas 75275, USA
2 Dipartimento di Scienze della Terra, Università di Trieste, via Weiss 8, 34127 Trieste, Italy
3 Stanford University, Palo Alto, California 94305, USA

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.






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