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

Sletten, K.; Blikra, Lars Harald; Ballantyne, C. K.; Nesje, Atle; Dahl, Svein Olaf
Peer reviewed, Journal article
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https://hdl.handle.net/1956/413
Utgivelsesdato
2003
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  • Department of Earth Science [868]
Originalversjon
https://doi.org/10.1191/0959683603hl673rp
Sammendrag
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 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 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.
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Arnold
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Copyright 2003 Arnold

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