期刊
QUATERNARY RESEARCH
卷 83, 期 2, 页码 324-335出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2014.12.005
关键词
Rock glacier; Lazaun; Otztal Alps; Holocene drought
资金
- Proalp (Mapping and Monitoring of permafrost phenomena in the Alps - Autonomous Province of Bolzano-South Tyrol)
- PermaNET (Permafrost long-term monitoring network, Interreg Alpine Space project)
- PERMAQUA (Interreg IV Italy-Austria)
Two cores were drilled on rock glacier Lazaun in the southern Otztal Alps (N Italy). The average ice content of core Lazaun I is 43 vol.% and of core Lazaun Ills 22 vol.%. Radiocarbon dating of plant macrofossil remains of core Lazaun I yielded ages ranging from 8960 cal yr BP at a depth of ca. 23.5 m to 2240 cal yr BP at a depth of 2.8 m, indicating that the ice near the base is approximately 10,300 yr old. The rock glacier was intact since that time and the ice persisted even during warm periods of the Holocene. An ice-free debris layer between 16.8 and 14.7 m separates the rock glacier into two frozen bodies. Inclinometer measurements indicate that both frozen bodies are active and that deformation occurs within a shear horizon at a depth of 20-25 m at the base of the lower frozen body and to a minor extent at a depth of approximately 14 m at the base of the upper frozen body. The ice-free debris layer in the middle of the Lazaun rock glacier indicates a more than five centennial long drought period, which dates to about 4300-3740 cal yr BP. (C) 2014 University of Washington. Published by Elsevier Inc. All rights reserved.
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