Nephelines from the Somma-Vesuvius volcanic complex (Southern Italy): Crystal-chemical, structural and genetic investigations (Articolo in rivista)

Type
Label
  • Nephelines from the Somma-Vesuvius volcanic complex (Southern Italy): Crystal-chemical, structural and genetic investigations (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00710-013-0290-6 (literal)
Alternative label
  • Balassone G.; Kahlenberg V.; Altomare A.; Mormone A.; Rizzi R.; Saviano M.; Mondillo N. (2014)
    Nephelines from the Somma-Vesuvius volcanic complex (Southern Italy): Crystal-chemical, structural and genetic investigations
    in Mineralogy and petrology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Balassone G.; Kahlenberg V.; Altomare A.; Mormone A.; Rizzi R.; Saviano M.; Mondillo N. (literal)
Pagina inizio
  • 71 (literal)
Pagina fine
  • 90 (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84893744595&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 108 (literal)
Rivista
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  • 1 (literal)
Note
  • Scopu (literal)
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  • Dipartimento di Scienze della Terra, Ambiente e Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy; Institut für Mineralogie und Petrographie, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria; CNR Istituto di Cristallografia (IC), Via Giovanni Amendola, 122/O, 70126 Bari, Italy; INGV Osservatorio Vesuviano, Via Diocleziano 328, 80124 Naples, Italy (literal)
Titolo
  • Nephelines from the Somma-Vesuvius volcanic complex (Southern Italy): Crystal-chemical, structural and genetic investigations (literal)
Abstract
  • Sixteen nephelines from different geological occurrences were sampled at the type-locality, the Somma-Vesuvius volcanic complex (southern Italy), and investigated for their chemistry and crystal structure obtained by both single-crystal and powder X-ray diffraction. Nepheline-bearing samples are metamorphic or from magmatic ejecta and pumice deposits. The lower K contents characterize the pumice- and some metamorphic-derived nephelines, whereas the higher ones are found in some samples from magmatic nodules. The amount of the anorthite molecule, quite low on average, can be more variable in the metamorphic nephelines. The crystal-structure investigations on Somma-Vesuvius samples compare well with previous studies of natural nephelines. All 16 nepheline samples adopt space group P63. The observed lattice parameters vary between 9.9768-9.9946 Å (for a) and 8.3614-8.3777 Å (for c), respectively. Furthermore, chemical analysis revealed that all specimens exhibit an excess of Si relative the ideal Si:Al ratio of 1:1. The analysis of the T-O distances in our samples clearly indicates a distinct ordering process of aluminium and silicon on the tetrahedral sites which is an agreement with Loewenstein's rule. A linear correlation between the distance of symmetry equivalent split atoms O(1)-O(1)' and the T(1)-O(1)-T(2) tilt angle was observed. The average (B = Na) distances of all crystals are very similar which is consistent with the outcome of the site population refinement indicating full occupancy with sodium. Oriented precession-type sections of reciprocal space indicated the presence of at least the most intense family of satellite peaks, demonstrating that this group of satellite reflections can occur not only in nephelines from pegmatites and ijolites but also in rocks from completely different petrological settings. (literal)
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