The magmatic evolution of the Late Miocene laccolith-pluton-dyke granitic complex of Elba Island, Italy. (Articolo in rivista)

Type
Label
  • The magmatic evolution of the Late Miocene laccolith-pluton-dyke granitic complex of Elba Island, Italy. (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Dini A. Innocenti F., Rocchi S., Tonarini S., Westerman D.S. (2002)
    The magmatic evolution of the Late Miocene laccolith-pluton-dyke granitic complex of Elba Island, Italy.
    in Geological magazine (Print)
    (literal)
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  • Dini A. Innocenti F., Rocchi S., Tonarini S., Westerman D.S. (literal)
Pagina inizio
  • 257 (literal)
Pagina fine
  • 279 (literal)
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  • The Island of Elba represents a key site for comprehending the evolution of the Northern Apennines and its relationship with the evolution of the Alps. Since the beginning of modern geology, the studies on Elba Island have inflamed scientific controversies, not yet appeased, that represent a reference point in the progress of understanding the northern Tyrrhenian area. This paper represents the first multidisciplinary study (detailed mapping, petrography, geochronology, geochemistry and isotopes) of the best-exposed intrusive-subvolcanic complex in Tuscan Magmatic Province. (literal)
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  • 139 (literal)
Rivista
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  • Impact Factor 1.671 (literal)
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  • Since the magmatic processes in most igneous complexes of the Tuscan Magmatic Province have been short-lived, the information they give about deep-seated processes and materials is restricted to inter-complex comparisons. The intrusive activity of western-central Elba Island, however, covers a significant time span (from 8 to 6.8 Ma), thus offering the opportunity to investigate intra-complex temporal variations of deep-seated processes and materials. Detailed mapping, study of intrusive relationships, and construction of cross sections have established the intrusive sequence of the Elba igneous units, and petrographic-geochemical data have validated the field definitions of these units and their correlation from outcrop to outcrop. Furthermore, a detailed geochronologic, geochemical and Sr-Nd isotope investigation was carried out in order to constrain the compositions of the materials involved in the genesis of the Elba magmas and to compare them to the Tuscan Magmatic Province. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • (a) Dini A., (b) Innocenti F., (b) Rocchi S., (a) Tonarini S., (c) Westerman D.S. (a) CNR, Istituto Geoscienze e Georisorse-CNR, Via Moruzzi 1, 56124, Pisa, Italy (b) Università di Pisa, Dipartimento di Scienze della Terra, Via S. Maria 53, 56126, Pisa, Italy (c) Norwich University, Department of Geology, Northfield, Vermont 05663, USA (literal)
Titolo
  • The magmatic evolution of the Late Miocene laccolith-pluton-dyke granitic complex of Elba Island, Italy. (literal)
Abstract
  • Anatectic-hybrid magmatism affected Tuscany (Italy) during Late Miocene, building up the Tuscan Magmatic Province (TMP) as the Apennine fold belt was thinned, heated and intruded by magmas. An intrusive complex was progressively built on Elba Island by emplacement of multiple laccoliths, a major pluton, and a final dyke swarm, all within the span from about 8 to 6.8 Ma. Several distinct magma sources, in both the crust and mantle, have been identified as contributing to the Elba magmatism as it evolved from crust-, to hybrid-, to mantle-dominated. However, a restricted number of components, geochemically similar to mafic K-andesites of the Island of Capraia and Cotoncello leucogranites at Elba, are sufficient to account for the generation by melt hybridization of the most voluminous magmas. Unusual magmas were emplaced at the beginning and end of the igneous activity, without contributing to the generation of these hybrid magmas. These are represented by early anatectic rocks (87Sr/86Sr from 0.7115 to 0.7146), and late mantle-derived magma strongly enriched in incompatible elements (87Sr/86Sr = 0.7114) with geochemical-isotopic characteristics intermediate between contemporaneous Capraia K-andesites and later lamproites from the TMP. The occurrence of such variety of rocks emphasizes the variable nature of crust and mantle sources that can be activated in a short time span during post-collisional magmatism. (literal)
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