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Micro-PIXE analysis of Monazite from Dora Maira Massif (Western Italian Alps, Italy). (Articolo in rivista)

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Micro-PIXE analysis of Monazite from Dora Maira Massif (Western Italian Alps, Italy). (Articolo in rivista) (literal)

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Vaggelli G.; Borghi A.; Cossio R.; Fedi M.; Giuntini L.; Lombardo B.; Marino A.; Massi M.; Olmi F.; Petrelli M. (2006)
Micro-PIXE analysis of Monazite from Dora Maira Massif (Western Italian Alps, Italy).
in Mikrochimica acta (1966, Print)
(literal)

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Vaggelli G.; Borghi A.; Cossio R.; Fedi M.; Giuntini L.; Lombardo B.; Marino A.; Massi M.; Olmi F.; Petrelli M. (literal)

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CNR - Istituto di Geoscienze e Georisorse, Via V. Caluso 35, Torino, Italy Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, Via V. Caluso 35, Torino, Italy Dipartimento di Fisica Sperimentale, Via P. Giuria 1, Torino, Italy Dipartimento di Fisica - INFN Firenze, via Sansone 1, Sesto Fiorentino, Italy Paschera San Carlo 66 bis, Caraglio, Italy CNR - Istituto di Geoscienze e Georisorse, Via G. La Pira 4, I-50121 Firenze, Italy Dipartimento di Scienze della Terra, Piazza dell'Università 1, Perugia, Italy (literal)

Titolo

Micro-PIXE analysis of Monazite from Dora Maira Massif (Western Italian Alps, Italy). (literal)

Abstract

Quantitative micro-PIXE and electron microprobe analyses, as well as micro-PIXE compositional mapping of trace elements were performed on monazite [(Ce, La, Nd, Th)PO4] inclusions in pyrope megablasts from Dora Maira Massif, Western Italian Alps for petrological and geochronological purposes. Monazite was studied by SEM-BSE imaging and by X-ray qualitative compositional maps of major elements; further WDS electron microprobe analyses were carried out in areas showing different BSE intensity in order to quantify chemical zoning. Finally, micro-PIXE compositional maps and quantitative analyses were performed on selected spots and areas. EPMA data indicate that the Dora Maira monazite is Ce- and Th-rich with homogeneous concentrations of LREE, but with a significantly heterogeneous distribution of Th, as well as of Y, Sr, U and Pb as displayed by micro-PIXE compositional mapping. HREE mostly occur in concentrations below the detection limit for standard quantitative EPMA. Th-U-Pb zoning suggests two monazite growth events, dated at 35 (±7 Ma) and 60 Ma (±10 Ma), respectively. While the younger age of 35 Ma found in high-Th monazite areas corresponds to the thermal and baric peak of the UHP metamorphism in the Dora Maira Massif, in agreement with previous literature data, the older ages of 60 Ma found in low-Th areas have to be confirmed by U-Th-Pb isotopic data. (literal)

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