Metasomatic events recorded in ultramafic xenoliths from the Hyblean area (Southeastern Sicily, Italy). (Articolo in rivista)

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  • Metasomatic events recorded in ultramafic xenoliths from the Hyblean area (Southeastern Sicily, Italy). (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00710-008-0031-4 (literal)
Alternative label
  • Scribano V.; Viccaro M.; Cristofolini R.; Ottolini L. (2009)
    Metasomatic events recorded in ultramafic xenoliths from the Hyblean area (Southeastern Sicily, Italy).
    in Mineralogy and petrology; Springer Wien, Wien (Austria)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Scribano V.; Viccaro M.; Cristofolini R.; Ottolini L. (literal)
Pagina inizio
  • 235 (literal)
Pagina fine
  • 250 (literal)
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  • 95 (literal)
Rivista
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  • In: Mineralogy and Petrology, vol. 95 (3-4) pp. 235 - 250. Springer, 2009. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3-4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Scribano V. 1); Viccaro M. 1); Cristofolini R. 1); Ottolini L. 2). 1) Dipartimento di Scienze Geologiche, Universit√† di Catania, Catania, Italy; 2) CNR-IGG, Sezione di Pavia, Pavia, Italy. (literal)
Titolo
  • Metasomatic events recorded in ultramafic xenoliths from the Hyblean area (Southeastern Sicily, Italy). (literal)
Abstract
  • Three types of ultramafic xenoliths from the Hyblean area (Sicily) show prime evidence for mantle metasomatism, namely: 1) Spinel-facies depleted harzburgite veined by phlogopite-bearing clinopyroxenite; 2) Amphibole-bearing harzburgite; and 3) Al-spinel websterite. (2) and (3) exhibit glassy pockets having respectively mugearitic and basanitic compositions, but a little amount of glass with low Ca and very low alkalis in (2). Glasses generally show trace element distributions consistent with the partial melting of pargasite-dominated mineral assemblages. Abundant Ca-Mg-carbonate globules immersed in these glassy pockets testify to immiscibility between silicate and carbonatite melts. Silicate melts and hydrous-silicate supercritical fluids, which underwent phase separation during fluxing throughout the semi-brittle lithospheric mantle, may account for such metasomatizing processes. The nature and abundance of some fluid-mobile elements in glasses and hydrous minerals (especially the Ca-poor glass, with B = 59 ppm, Li = 27 ppm, Ba = 700 ppm and phlogopite, with Ba = 8,465 ppm, Sr = 260 ppm, F = 5,700 ppm) suggest that some hydrous fluids may derive from hydrothermally altered oceanic crust. Conversely, metasomatizing silicate melts probably have a deep-seated origin. These results confirm previous suggestions on the key role of mantle metasomatism in the origin of some alkaline Hyblean magmas. (literal)
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