Magmatic plumbing of a large Permian caldera exposed to a depth of 25 km
- 1Southern Methodist University, Dallas, Texas 75275, USA
- 2Dipartimento di Scienze della Terra, Università di Trieste, via Weiss 8, 34127 Trieste, Italy
- 3Stanford University, Palo Alto, California 94305, USA
Abstract
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.
Footnotes
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↵GSA Data Repository item 2009141, analytical techniques, tables, diagrams, and detailed analysis of geochronologic data, and an explanation of the construction of the model crustal section and synthetic seismic profiles, is available online at www.geosociety.org/pubs/ft2009.htm, or on request from editing{at}geosociety.org or Documents Secretary, GSA, P.O. Box 9140, Boulder, CO 80301, USA.
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- Received 5 January 2009.
- Revision received 14 February 2009.
- Accepted 18 February 2009.
- © 2009 Geological Society of America
