Holocene debris flows recognized in a lacustrine sedimentary succession: sedimentology, chronostratigraphy and cause of triggering

This study focuses on the sedimentary characteristics and the chronostratigraphy of Holocene massflow deposits recognized in a lake-fill sedimentary succession. These deposits in lake Ulvådalsvatnet, western Norway, are discrete, sharp-bounded units of sand-sized sediment, running from gravelly and...

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Bibliographic Details
Published in:Holocene (Sevenoaks) 2003-11, Vol.13 (6), p.907-920
Main Authors: Sletten, K., Blikra, L. H., Ballantyne, C. K., Nesje, A., Dahl, S. O.
Format: Article
Language:English
Subjects:
Environmental studies
Freshwater
Geology and climatology
Methodology and general studies
Prehistory and protohistory
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Summary:This study focuses on the sedimentary characteristics and the chronostratigraphy of Holocene massflow deposits recognized in a lake-fill sedimentary succession. These deposits in lake Ulvådalsvatnet, western Norway, are discrete, sharp-bounded units of sand-sized sediment, running from gravelly and graded to silt-rich, and characterized by low total carbon and water contents. They are rich in terrestrial macrogflora detritus, dark brown in colour, and interpreted as high-density turbidity current deposits attributed to subaerial debris flows that plunged into the lake. Thirty-three 14C AMS dates were derived from three cores, and though the ages are somewhat inconsistent (macroflora invariably younger than bulk sediment samples), they indicate a marked increase in debris-flow processes after c. 2200 cal. yr BP, considered to reflect increased occurrence of heavy rainstorms.
ISSN:0959-6836
1477-0911
DOI:10.1191/0959683603hl673rp