COMBINATION OF NUMERICAL DATING TECHNIQUES USING 10Be IN ROCK BOULDERS AND 14C OF RESILIENT SOIL ORGANIC MATTER FOR RECONSTRUCTING THE CHRONOLOGY OF GLACIAL AND PERIGLACIAL PROCESSES IN A HIGH ALPINE CATCHMENT DURING THE LATE PLEISTOCENE AND EARLY HOLOCENE

被引:9
|
作者
Favilli, Filippo [1 ]
Egli, Markus [1 ]
Brandova, Dagmar [1 ]
Ivy-Ochs, Susan [1 ]
Kubik, Peter W. [2 ]
Maisch, Max [1 ]
Cherubini, Paolo [3 ]
Haeberli, Wilfried [1 ]
机构
[1] Univ Zurich Irchel, Dept Geog, CH-8057 Zurich, Switzerland
[2] Swiss Fed Inst Technol, Inst Particle Phys, Paul Scherrer Inst, CH-8093 Zurich, Switzerland
[3] Swiss Fed Inst Forest Snow & Landscape Res, WSL, CH-8903 Birmensdorf, Switzerland
关键词
COSMOGENIC NUCLIDES; RADIOCARBON CALIBRATION; EUROPEAN ALPS; SWISS-ALPS; STABILIZATION; ICE; FLUCTUATIONS; STRATIGRAPHY; TERMINATION; OXIDATION;
D O I
10.1017/S0033822200055910
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Glacier fluctuations and paleoclimatic oscillations during the Late Quarternary in Val di Rabbi (Trentino, northern Italy) were reconstructed using a combination of absolute dating techniques (C-14 and Be-10) and soil chemical characterization. Extraction and dating of the stable fraction of soil organic matter (SOM) gave valuable information about the minimum age of soil formation and contributed to the deciphering of geomorphic surface dynamics. The comparison of Be-10 surface exposure dating (SED) of rock surfaces with the C-14 ages of resilient (resistant to H2O2 oxidation) soil organic matter gave a fairly good agreement, but with some questionable aspects. It is concluded that, applied with adequate carefulness, dating of SOM with C-14 might be a useful tool ill reconstructing landscape history in high Alpine areas with siliceous parent material. The combination of C-14 dating of SOM with SED with cosmogenic Be-10 (on moraines and erratic boulders) indicated that deglaciation processes in Val di Rabbi were already ongoing by around 14,000 cal BP at an altitude of 2300 m asl and thin glacier oscillations might have affected the higher of the region until about 9000 cal BP. Be-10 and C-14 ages correlate well with the altitude of the sampling sites and with the established Lateglacial chronology.
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页码:537 / 552
页数:16
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