Two-stage growth of laccoliths at Elba Island, Italy

Research Article| November 01, 2002 Two-stage growth of laccoliths at Elba Island, Italy Sergio Rocchi; Sergio Rocchi 1Università di Pisa, Dipartimento di Scienze della Terra, Pisa I-56126, Italy Search for other works by this author on: GSW Google Scholar David S. Westerman; David S. Westerman 2Norwich University, Department of Geology, Northfield, Vermont 05663, USA Search for other works by this author on: GSW Google Scholar Andrea Dini; Andrea Dini 3Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa I-56124, Italy Search for other works by this author on: GSW Google Scholar Fabrizio Innocenti; Fabrizio Innocenti 4Università di Pisa, Dipartimento di Scienze della Terra, Pisa I-56126, Italy Search for other works by this author on: GSW Google Scholar Sonia Tonarini Sonia Tonarini 5Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa I-56124, Italy Search for other works by this author on: GSW Google Scholar Geology (2002) 30 (11): 983–986. https://doi.org/10.1130/0091-7613(2002)030<0983:TSGOLA>2.0.CO;2 Article history received: 09 Apr 2002 rev-recd: 12 Jul 2002 accepted: 15 Jul 2002 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sergio Rocchi, David S. Westerman, Andrea Dini, Fabrizio Innocenti, Sonia Tonarini; Two-stage growth of laccoliths at Elba Island, Italy. Geology 2002;; 30 (11): 983–986. doi: https://doi.org/10.1130/0091-7613(2002)030<0983:TSGOLA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract At Elba Island, Italy, nine shallow-level late Miocene granite porphyry layers connected by feeder dikes built up three nested Christmas-tree laccoliths. Detailed mapping and reconstruction of tectonic history led to restoration of the original 5-km-thick sequence and determination of the dimensional parameters of each intrusive layer. The laccolith layers were emplaced at depths between 1.9 and 3.7 km, exploiting physical discontinuities that served as crustal magma traps inside a stack of nappes. The intrusive layers are 50–700 m thick, with diameters between 1.6 and 10 km. Length to thickness relationships for individual laccolith layers show a power-law correlation that does not fit the known dimensional distribution for laccoliths, but instead fits a line with a slope typical of the theoretical vertical-inflation stage of laccolith development. This is interpreted as the first reported natural example of the occurrence of a vertical-inflation stage during laccolith growth. The dimensional data for Elba intrusive layers also suggest that laccoliths and plutons commonly form by amalgamation of smaller sheet-like bodies, while multilayer laccoliths form when coalescence fails, possibly owing to the large availability of crustal magma traps. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.