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Geological Society, London, Special Publications; 2004; v. 234; p. 151-161;
DOI: 10.1144/GSL.SP.2004.234.01.09
© 2004 Geological Society of London

Tectonic control on laccolith emplacement in the northern Apennines fold-thrust belt: the Gavorrano intrusion (southern Tuscany, Italy)

Francesco Mazzarini1, Giacomo Corti2, Giovanni Musumeci2 & Fabrizio Innocenti2

1 Istituto di Geoscienze e Georisorse CNR, Via G.Moruzzi 1, 56100, Pisa, Italy mazzarini{at}igg.cnr.it
2 Dipartimento di Scienze della Terra, Via S. Maria 53, 56126 Pisa, Italy

Mechanical discontinuities within the crust, represented by tectonic structures (faults) or lithological heterogeneities, strongly control the emplacement of magmas as tabular intrusions within the middle-upper crust. The occurrence of mechanical layering is a common feature in fold and thrust belts. In the northern Apenniness, a Cenozoic fold-thrust belt affected in its inner part by Neogene magmatism, the Gavorrano laccolith (southern Tuscany) is a particularly suitable example for studying the relationships between magmatism and tectonic structures. New geological mapping, together with a large amount of subsurface data available from historical mining activity in the area, have allowed the reconstruction of:

1 the original relationships of the intrusion within the nappe pile, and
2 the laccolithic shape of the intrusion.

Using the Gavorrano laccolith as an example, we propose that the emplacement of Neogene intrusions in southern Tuscany was strongly controlled by the occurrence of mechanical discontinuities represented by thrust zones in the nappe pile.