Fibrous mineral detection in natural soil and risk mitigation (1(st) paper)

The paper describes a fibrous mineral detection methodology, which is based on the use of alternating rotary motion sieving equipment. The equipment was redesigned to meet additional requirements with respect to initial ones. Under this methodology, the fine fraction passing through the sieves was recovered and analysed to determine the sedimentology, mineralogy and morphology of the potentially particulating fraction. Reliance was made on the following analytical techniques: laser granulometry, scanning electron microscopy/energy dispersive spectrometry (SEM/EDS) and polarised and phase contrast light microscopy (PLM, PCLM) for fibrous mineral identification and Walton-Beckett / whole field fibre counting. The samples for the analyses came from known areas with fibrous minerals, e.g. Lauria (Basilicata), and less known areas, e.g. the Natural Reserve of Mt. Rufeno (Latium) and Biancavilla (Sicily). With this methodology, fibres may be directly detected in both farmed and unfarmed soil with fibrous minerals and the process may be repeated in the various stages of farming or during works for creation of fire barriers or lanes, hydrogeological restoration etc. The goal is to identify risks arising from the natural occurrence of asbestos upon atypical activities, such as farming and forestry. With regard to exposure, consideration was given to fibrous minerals not currently classified in the relevant legislation, thus going beyond the search for asbestiform minerals in quarry sites located in ophiolite outcrop areas

Sodalite from Vetralla (Roman potassic province) and Bancroft (Ontario, Canada): observed and simulated IR spectra

Infrared spectra of sodalites from Vetralla and Bancroft are compared to simulated spectra calculated from the available structural data and from empirical force constants applied to a simplified part-central-force potential-energy model. Calculation gives 18 vibrational modes including the 370 cm-1 mode observed by other authors in Raman spectra only. Increasing Si-O stretching constant implies variation of 3 high-frequency modes. The band group in the 750-650 cm-1 region comprises 3 modes strongly influenced by fal-o and subordinately by fsi-al. The 4 modes in the 500-350 cm-1 region are influenced by fo-si-o with weak contribution of O-oscillation, while the 295 cm-1 band is strongly influenced by fo-o, fNa-o and fal-o © 1991 Accademia nazionale dei Lincei

Indagini per l'individuazione di placers nella piattaforma continentale interna tra M.te Argentario ed Ansedonia (Toscana meridionale

Trattasi di una indagine per la ricerca di placers marini che si avvale di analisi morfologiche, sismostratigrafiche, sedimentologiche e mineralogiche

Caratteristiche morfologiche, stratigrafiche e sedimentologiche della piattaforma continentale interna tra M.te Argentario e Torre Sant'Agostino

Vengono presentate le caratteristiche morfologiche, sedimentologiche e stratigrafiche della piattaforma continentale in esame ipotizzandone l'evoluzione durante l'Olocene