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

L. H. Blikra

Geological Survey of Norway, N-7491 Trondheim, Norway

C. K. Ballantyne

Department of Geography and Geosciences, University of St Andrews, Fife KY16 9AL, Scotland, UK

A. Nesje

Department of Geology, University of Bergen, Allégt. 41, N-5007 Bergen, Norway

S. O. Dahl

Department of Geography, University of Bergen, Breiviksv. 40, N-5045 Bergen, Norway

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.

Key Words: Debris flows • lacustrine record • sedimentary facies • chronostratigraphy • triggering causes • Holo cene • Norway

The Holocene, Vol. 13, No. 6, 907-920 (2003)
DOI: 10.1191/0959683603hl673rp


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