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

K Sletten, LH Blikra, Colin Kerr Ballantyne, A Nesje, SO Dahl

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    47 Citations (Scopus)

    Abstract

    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 Ulvadalsvatnet, 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 macroflora 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 C-14 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.

    Original languageEnglish
    Pages (from-to)907-920
    Number of pages14
    JournalThe Holocene
    Volume13
    Issue number6
    DOIs
    Publication statusPublished - Sept 2003

    Keywords

    • debris flows
    • lacustrine record
    • sedimentary facies
    • chronostratigraphy
    • triggering causes
    • Holocene
    • Norway
    • TERRESTRIAL PLANT MACROFOSSILS
    • WESTERN NORWAY
    • LAKE-SEDIMENTS
    • DEPOSITIONAL PROCESSES
    • JOSTEDALSBREEN REGION
    • POSTGLACIAL COLLUVIUM
    • PALEOCLIMATIC RECORD
    • WINTER-PRECIPITATION
    • TURBIDITY CURRENTS
    • SOUTHERN NORWAY

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