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| Titel |
Sedimentological characteristics of ice-wedge polygon terrain in Adventdalen (Svalbard) – environmental and climatic implications for the late Holocene |
| VerfasserIn |
M. Oliva, G. Vieira, P. Pina, P. Pereira, M. Neves, M. C. Freitas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 2 ; Nr. 5, no. 2 (2014-09-01), S.901-914 |
| Datensatznummer |
250115334
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| Publikation (Nr.) |
 copernicus.org/se-5-901-2014.pdf |
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| Zusammenfassung |
| Ice wedges are widespread periglacial features in the
landscape of Adventdalen, Svalbard. The networks of ice wedges have created
areas with well-developed polygonal terrains in the lowest fluvial terraces
in this valley. We have examined the sedimentological characteristics of the
northern and southern banks of the Advent river for palaeoenvironmental
purposes. The base of two sedimentary sections reported radiocarbon dates of
3.3 and 3.9 ka BP, respectively. The northern site is constituted by
three very different lithostratigraphical units, which suggests that their
formation should be related to different environmental and climate
conditions. By contrast, the southern section shows a rather homogeneous
composition, with no significant variations in grain size and organic matter
content. In both cases the uppermost sediments are constituted by a thick
aeolian deposit. According to our data, warmer climate conditions may have
prevailed during the mid Holocene until 3.3 ka BP with widespread peat
formation in the valley bottom. Subsequently, a period with alternating soil
formation and aeolian sedimentation took place from 3 to 2.5 ka BP,
probably due to increasing climatic severity. During the last millennium a
long-term cooling trend has favoured aeolian deposition in the lowest part of Adventdalen. |
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