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Bulletin of Volcanology

, Volume 71, Issue 9, pp 977–1005 | Cite as

Isotope geochemistry (Sr–Nd–Pb) and petrogenesis of leucite-bearing volcanic rocks from “Colli Albani” volcano, Roman Magmatic Province, Central Italy: inferences on volcano evolution and magma genesis

  • Elena Boari
  • Riccardo Avanzinelli
  • Leone Melluso
  • Guido Giordano
  • Massimo Mattei
  • Arnaldo A. De Benedetti
  • Vincenzo Morra
  • Sandro Conticelli
Research Article

Abstract

The “Colli Albani” composite volcano is made up of strongly silica-undersaturated leucite-bearing rocks. Magmas were erupted during three main periods, but a complex plumbing system dominated by regional tectonics channelled magmas into different reservoirs. The most alkali-rich magmas, restricted to the caldera-forming period (pre-caldera), are extremely enriched in incompatible trace elements and display more radiogenic Sr (87Sr/86Sr = 0.71057–0.71067), with slightly less radiogenic Pb with respect to those of the post-caldera period. Post-caldera volcanic activity was concentrated in three different volcanic environments: external to the caldera, along the caldera edge and within the caldera. The post-caldera magmas produced melilite- to leucitite-bearing, plagioclase-free leucitites. In contrast to the pre-caldera lavas, they are characterised by lower incompatible trace element abundances and less radiogenic Sr (87Sr/86Sr = 0.71006–0.71039). Magmas evolved through crystal fractionation plus minor crustal assimilation in a large magma chamber during the pre-caldera period. The multiple caldera collapses dissected and partially obliterated the early magma chamber. During the post-caldera stage, magmas were channelled through several pathways and multiple shallow-level magma reservoirs were established. A lithospheric mantle wedge previously depleted in the basaltic component and subsequently enriched by metasomatic slab-derived component is suggested as the mantle source of Colli Albani parental magmas. Two different parental magmas are recognised for the pre- and post-caldera stages. The differences may be related to the interplay between smaller degrees of melting for the pre-caldera magmas and more carbonate-rich recycled subducted lithologies in the post-caldera magmas.

Keywords

Sr–Nd–Pb isotopes in volcanic rocks Ultrapotassic rocks Leucitites Leucite-bearing melilites Colli Albani volcano Roman Magmatic Province Central Italy 

Notes

Acknowledgments

We sincerely thank Filippo Olmi, to whose memory this paper is dedicated, for allowing access to EPMA facilities and for his skilful assistance during microprobe analyses. We also thank Antonio Canzanella (Naples) and Elena Pecchioni (Florence) for the assistance during XRF analyses, Enzo Monetti for performing wet chemical analyses and Simone Tommasini and Chiara M. Petrone for helping with isotopic analyses. Stirring and focussing discussions with Renato Funiciello, Angelo Peccerillo, Giuseppe Diano and Simone Tommasini are greatly appreciated. Thoughtful peer-reviews by Cliff Shaw and Martin Menzies greatly improved the manuscript and are highly appreciated. Final critical reading of Grant Heiken is warmly thanked. Editorial handling by John Stix and Raffaello Cioni is also appreciated. Financial support was provided by the Università degli Studi di Firenze, by MIUR through FIRB_2001 (grant no. RBAU01FX8M_003) and PRIN_2008 (grant nos. 2008HMHYFP_002; 2008HMHYFP_003; 2008HMHYFP_004).

Supplementary material

445_2009_278_MOESM1_ESM.xls (84 kb)
ESM 1 (XLS 83 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Elena Boari
    • 1
  • Riccardo Avanzinelli
    • 1
    • 5
  • Leone Melluso
    • 2
  • Guido Giordano
    • 3
  • Massimo Mattei
    • 3
  • Arnaldo A. De Benedetti
    • 3
  • Vincenzo Morra
    • 2
  • Sandro Conticelli
    • 1
    • 4
  1. 1.Dipartimento di Scienze della TerraUniversità degli Studi di FirenzeFlorenceItaly
  2. 2.Dipartimento di Scienze della TerraUniversità degli Studi di Napoli Federico IINaplesItaly
  3. 3.Dipartimento di Scienze GeologicheUniversità degli Studi Roma TreRomeItaly
  4. 4.Sezione di Firenze, Istituto di Geoscienze e GeorisorseConsiglio Nazionale delle RicercheFlorenceItaly
  5. 5.Department of Earth SciencesUniversity of BristolBristolUK

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