Analysis of lapideus materials from the columns of the cathedral of St Maria in Randazzo (Catania,Italy) and from their ancient origin quarries |
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| Affiliation: | 1. UMR CNRS 5243 Géosciences Montpellier, Université Montpellier 2, CC 060, Pl. Eugène Bataillon, 34095 Montpellier, Cedex 05, France;2. Laboratoire des Géosciences Appliquées LGA, Université Mohamed 1er, faculté des sciences, Oujda, Morocco;3. UMR CNRS 5276 Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement, Université Claude Bernard Lyon 1, Boulevard du 11 Novembre 1918, 69622 Villeurbanne, Cedex, France;4. National Institute of Marine Geology and Geo-ecology (GeoEcoMar), Str. Dimitrie Onciul, nr 23-25, RO-024053, Bucharest, Romania;5. Muséum national d''histoire naturelle, département Histoire de la Terre, 8, rue Buffon, CP38, 75005 Paris, Cedex 05, France;6. Département de Géologie, Université Abdelmalek Esaadi, 93003 Tetuán, Morocco;7. Department of Historical Geology-Paleontology, University of Athens, Panepistimiopolis, 15784 Athens, Greece;1. Department of Genetics, Laboratory of Molecular Genetics and Cytogenetics, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás 74690-900, Brazil;2. Department of Chemistry, Federal Institute of Education, Science and Technology of Goiás, Goiânia, Goiás 74055-110, Brazil;3. Department of Chemistry, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil;4. Department of Microbiology, Laboratory of DNA Repair, Institute of Biomedical Sciences, University of São Paulo – USP, São Paulo, SP 05508-900, Brazil;5. Department of Physiological Sciences, Institute of Biological Sciences, Federal University of Goiás - UFG, Goiânia, GO 74690-900, Brazil;6. Departament of Biomedicine, Pontifical Catholic University of Goiás, Goiânia, GO, Brazil;7. Department of Morphology, Institute of Biological Sciences, Federal University of Goiás, Goiânia, GO 74690-900, Brazil;8. Coordination of Science and Technology, Federal University of Maranhão, São Luís, MA 65080-805, Brazil;9. Department of Radiation Medicine, University of Kentucky, Lexington, KY 40536, United States of America;10. L. P. Markey Cancer Center, University of Kentucky, Lexington, KY 40536, United States of America;1. Petrobras S.A., Av. Henrique Valadares, 28, 6th floor, Rio de Janeiro, RJ 20231-030, Brazil;2. Geology Department, Geoscience Institute, Universidade Federal do Rio de Janeiro, Av Athos da Silveira Ramos 274, Rio de Janeiro, RJ 21941-916, Brazil;3. Department of Geology and Geochemistry, Faculty of Sciences, Universidad Autónoma de Madrid, 28049 Madrid, Spain;4. Geoscience Institute, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil |
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| Abstract: | Lava columns from the cathedral St Maria of Randazzo (Catania, Italy), were studied in order to establish the classification of these rocks and to investigate their origin. At the beginning of the XIX century, some columns of the old frame of the nave were removed to build the dome and stored in a fornix beneath the cathedral. Samples were taken directly from these columns. The specimens underwent petrographic investigation through optical microscopy, X-ray diffraction analysis (XRD) and Fourier transform infrared spectroscopy (FTIR) and chemical analyses of major and trace elements through X-ray fluorescence (XRF). Some trace element (Sr, Rb, Y, Zr and Nb) concentrations were assessed through non-destructive analyses, performed with a portable X-ray device which can detect homogeneous concentrations of such elements on the columns of the cathedral. According to chemical data, these rocks can be classified as mugeariites whose mineral assemblage is given by plagioclase (mostly andesinic), augitic pyroxene, olivine, magnetite and, occasionally, apatite. In order to investigate the origin of the material used for the columns, a comparative examination was conducted between the column samples and specimens collected from quarries in the surrounding area of the town of Randazzo (Randazzo and Maniace quarries and the 1536 lava flow). The correlation with the Randazzo quarry proved to be excellent. |
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