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European Journal of Mineralogy; September, October 2005; v. 17; no. 5; p. 785-795; DOI: 10.1127/0935-1221/2005/0017-0785
© 2005 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Genetic evolution of nanocrystalline Fe oxide and oxyhydroxide assemblages from the Libiola mine (eastern Liguria, Italy)

: structural and microstructural investigations Cristina CARBONE1, Francesco DI BENEDETTO2, Pietro MARESCOTTI1,*, Alberto MARTINELLI3, Claudio SANGREGORIO4, Curzio CIPRIANI2, Gabriella LUCCHETTI1 and Maurizio ROMANELLI4

1 DIP.TE.RIS., Università di Genova, C.so Europa, 26, 1–16132 Genova, Italy
2 Museo di Storia Naturale, Università di Firenze, Via G. la Pira, 4, 1–50121 Firenze, Italy
3 INFM-LAMIA, C.so Perrone, 24, 1–16152 Genova, Italy
4 UdR INSTM and Dip. Chimica, Università di Firenze, Via della Lastruccia, 3, 1–50019 Sesto Fiorentino, Italy

* E-mail: marescot{at}dipteris.unige.it

The Libiola Fe-Cu-sulphide mine, near Sestri Levante (eastern Liguria), represents one of the most extensively exploited sulphide deposits in Italy. In this area, active Acid Rock Drainage (ARD) processes are evident. The major resulting mineral phases are Fe oxides and oxyhydroxides, occurring in varicoloured crusts on the surface of waste rocks and in unconsolidated muds.

In this study, the Fe assemblages of the waste rock were investigated by microchemical (SEM), structural (XRD), microstructural (TEM) and spectroscopic (DRS, IR, µ-Raman) techniques, in order to determine the phase composition, the textural relations among the minerals and their genetic evolution. They are characterized by intimate intergrowths of hematite and goethite with minor quartz and lepidocrocite; in some samples, the presence of very minor schwertmannite was detected.

TEM and HR-TEM observations revealed that hematite is present within pseudo-elliptical bodies as pseudo-hexagonal to subrounded nanocrystalline lamellae (from 18.9 to 26.5 nm in diameter), whereas goethite occurs either as parallel intergrowths of acicular crystals (from 10 to 16.3 µm in length) or as sheaf-like assemblages. On the basis of the present data, the studied Fe oxide and oxyhydroxide assemblages are found to represent distinct spatial and temporal stages of a nano-scale evolution process.

Key-words: TEM, spectroscopy, hematite, goethite, ARD.






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