http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29398

An electron microprobe analysis, secondary ion mass spectrometry and single crystal X-ray diffraction study of phlogopites from Mt. Vulture, Potenza, Italy: Consideration of cation partitioning. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

An electron microprobe analysis, secondary ion mass spectrometry and single crystal X-ray diffraction study of phlogopites from Mt. Vulture, Potenza, Italy: Consideration of cation partitioning. (Articolo in rivista) (literal)

Anno

2006-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.2138/am.2006.1882 (literal)

Alternative label

Mesto E.; Schingaro E.; Scordari F.; Ottolini L. (2006)
An electron microprobe analysis, secondary ion mass spectrometry and single crystal X-ray diffraction study of phlogopites from Mt. Vulture, Potenza, Italy: Consideration of cation partitioning.
in The American mineralogist; Mineralogical Society of America, Washington (Italia)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Mesto E.; Schingaro E.; Scordari F.; Ottolini L. (literal)

Pagina inizio

182 (literal)

Pagina fine

190 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

91 (literal)

Rivista

?The ?American mineralogist (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

n.1 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

1 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Mesto E. a); Schingaro E. a); Scordari F. a); Ottolini L. b). a) Univ Bari, Dipartimento Geomineral, I-70125 Bari, Italy b) CNR, IGG, Sez Pavia, I-27100 Pavia, Italy (literal)

Titolo

An electron microprobe analysis, secondary ion mass spectrometry and single crystal X-ray diffraction study of phlogopites from Mt. Vulture, Potenza, Italy: Consideration of cation partitioning. (literal)

Abstract

Mt. Vulture trioctahedral micas-1M mainly consist of phlogopite-annite solid solutions with a minor component of brittle micas. However, both Li-free and Li- and F-rich compositions may coexist in the same volcano-stratigraphic level. We report the results of electron microprobe analysis (EMPA), secondary ion mass spectrometry (SIMS), and single-crystal X-ray diffraction (SCXRD) for three crystals (LC7-27Go, LC7-3Go, and LC7-1R) that are representative of both compositions. EMPA and SIMS showed that sample LC7-1R is richer in TiO2, Li2O, and F and poorer in H2O than the other samples. Structure refinements using anisotropic displacement parameters for the three samples, performed in space group C2/m, converged at 3.46 <= R <= 4.34, 3.89 <= R-w <= 4.39. When considering bond distances, the three samples can be described as homo-octahedral whereas mean atomic numbers suggest that only LC7-1R is meso-octahedral. Significant differences occur among the samples for some distortion parameters commonly used for micas. In particular, LC7-1R displays higher values of BLDM2, shift(M2) and lower values of Delta(K-O4) and t(K-O4) than those of samples LC7-3Go and LC7-27Go. These differences are ascribed to F- and Ti-substitutions. Cation distributions were obtained by combining EMPA, SIMS, and SCXRD data after analysis of the effect of normalization schemes commonly used in mica formula recalculation. In LC7-3Go and LC7-27Go, Ti is incorporated according to the Ti-Tschermak mechanism, whereas more than one Ti-substitution mechanism occurs in LC7-1R. For the latter sample, octahedral vacancies are present leading to a complex substitution pattern and complex structural distortions related to the special octahedral compositions that were determined. (literal)

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