2013/12/18 by Giancarlο Della Ventura, Enrico Caprilli, Della Ventura, Giancarlo +6
Earth and Planetary Sciences · Materials Science · #Clay minerals and soil interactions #FOS: Physical sciences #Geological and Geochemical Analysis #Geophysics (physics.geo-ph) #Materials Science (cond-mat.mtrl-sci) #Mineralogy and Gemology Studies
paper · pdf · doi:10.48550/arxiv.1312.5300
openalex publication_date 2013/12/18 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28
This work relates the occurrence and the characterization of fibrous\ntremolite within the latest pyroclastic deposits of the Colli Albani (Alban\nHills) volcano, to the south-east of Rome (Italy). These mineralizations were\nobserved during a systematic rock-sampling undertaken to complete the\ngeological survey for the new 1:50 000 map of this volcanic area. The examined\nspecimens were collected inside distal deposits correlated to the last Albano\nMaar activity, which are geographically located within the boundaries of the\nNemi community. Tremolite occurs within both carbonate ejecta and the host\npyroclastic rocks. It shows up as whitish to light gray coloured aggregates of\ncrystals with fibrous aspect and sericeous brightness. Due to the extremely\nsmall crystal dimensions, never exceeding 0.5 micron in diameter, the\nmicro-chemical composition of the fibres could be obtained only by combining\nP-XRD, SEM-EDX and FTIR methods. Infrared spectroscopy, in particular, proved\nto be a valuable technique to characterize the studied amphibole. The\ncomposition determined is that of a Fe-free F-rich (c. 53%) tremolite with\nsignificant (c. 20%) richterite components in solid-solution. The occurrence of\nfibrous tremolite in an inhabited place, occurring as natural geological\nmaterial rather than being due to anthropogenic pollution, should be examined\nwith concern, because it implies complex health and legal responsibilities in\nthe case of mobilization due to extreme climatic events.\n