HR: 0800h
AN: C51A-1015    [Abstracts]
TI: Origin, Evolution and Age Considerations on a Hypogean Ice Deposit from a Cave in the Central Italian Alps
AU: Citterio, M
EM: michele.citterio@unimi.it
AF: Dept. of Earth Sciences "Ardito Desio", University of Milano, via Mangiagalli 34, Milano, 20133 Italy
AU: Turri, S
EM: stefano.turri@unimi.it
AF: Dept. of Earth Sciences "Ardito Desio", University of Milano, via Mangiagalli 34, Milano, 20133 Italy
AU: Bini, A
EM: alfredo.bini@unimi.it
AF: Dept. of Earth Sciences "Ardito Desio", University of Milano, via Mangiagalli 34, Milano, 20133 Italy
AU: Maggi, V
EM: valter.maggi@unimib.it
AF: Environmental and Territorial Sciences Dept., University of Milano-Bicocca, p.zza della Scienza 1, Milano, 20126 Italy
AU: * Marino, F
EM: federica.marino@unimib.it
AF: Environmental and Territorial Sciences Dept., University of Milano-Bicocca, p.zza della Scienza 1, Milano, 20126 Italy
AU: Pini, R
EM: roberta.pini@unimib.it
AF: C.N.R. - I.D.P.A., Consiglio Nazionale delle Ricerche - Istituto per la Dinamica dei Processi Ambientali, at the Dept. of Geological Sciences and Geotechnologies, University of Milano Bicocca, p.zza della Scienza 4, Milano, 20126 Italy
AU: Ravazzi, C
EM: cesare.ravazzi@idpa.cnr.it
AF: C.N.R. - I.D.P.A., Consiglio Nazionale delle Ricerche - Istituto per la Dinamica dei Processi Ambientali, Dalmine Laboratory, via Pasubio 5, Dalmine, BG 24044 Italy
AU: Santilli, M
EM: maurizio.santilli@unimi.it
AF: Dept. of Earth Sciences "Ardito Desio", University of Milano, via Mangiagalli 34, Milano, 20133 Italy
AU: Stenni, B
EM: stenni@univ.trieste.it
AF: Geological, Environmental and Marine Sciences Dept., University of Trieste, via E. Weiss 2, Trieste, 34127 Italy
AU: Udisti, R
EM: udisti@unifi.it
AF: Analytical Chemistry Dept., University of Firenze, via della Lastruccia 3, Polo Scientifico, Sesto Fiorentino, FI 50019 Italy
AB: The LO LC 1650 "Abisso sul Margine dell'Alto Bregai" ice cave is located in the central Italian Alps east of the Como Lake at an altitude of 2030 m. One snow and two ice deposits are known in this cave, where ice has been found down to a depth of about 120 m below the entrance. We show the results of the integration of data about the cave area, the ice cave, its main hypogean ice deposit and the first core from the top surface of this ice block. The investigated ice deposit is located at a depth of about 80 m and is not reachable by snow. Ice crystals texture and c-axes fabric show the succession of clear ice layers to have formed by the freezing of shallow cave lakes one on top of the other. A relative chronology of three accumulation and three ablation events is summarised and some upper and lower bounds to the age of the ice block are discussed. Stable isotopes and chemical data point to an age younger than the end of the last glaciation and older than the onset of a detectable industrial signal. Dendrochronological evidences combine with these data in suggesting that probably the cored part of the ice deposit was already formed before the 13th century, which means before the Little Ice Age.
DE: 3344 Paleoclimatology
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
DE: 1040 Isotopic composition/chemistry
DE: 1620 Climate dynamics (3309)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting