Orientation of gravels and soft-sediment clasts in subaqueous debrites- implications for palaeodirection reconstruction : case study from Puck Bay, northern Poland

Piotr Paweł Woźniak , Małgorzata Pisarska-Jamroży , Łukasz Elwirski

Abstract

Subaqueous debrites on a fan were recognized at Rzucewo (N Poland). Analysis of debrite fabric enabled debris-flow palaeodirections to be traced on the fan. The long axis azimuth and dip direction of lithic clasts (gravels) as well as soft-sediment clasts (SSC) were measured in the debrites. The results obtained indicate a palaeotransport direction to NNW, similar to the palaeocurrents interpreted from the asymmetrical ripples. However, detailed measurements of both gravels and SSC orientation show variability of palaeoflow directions between NW and NE sectors. In the proximal part of the fan, gravels indicate variable dip directions and dip angles, and a mostly scattered distribution of a-axis orientation. In the medial and distal parts of the fan, clasts are better ordered and usually their a-axes are oriented upslope or transverse to the palaeoslope inclination direction. Probably during the decelerating and halting of debris flows, the compression processes induced clast rotation and a change of inclination. In the distal part of the fan, debrites reveal a distinct variability of palaeoflow directions caused by flattened topography in which debris-flow lobes split and spread freely in different directions. Finally, we conclude that the individual sets of clast fabric usually indicate only local debris-flow directions.
Publication typeIn press (online first, early view)
Author Piotr Paweł Woźniak KGiGCz
Piotr Paweł Woźniak,,
- Department of Geomorphology and Quarternary Geology
, Małgorzata Pisarska-Jamroży
Małgorzata Pisarska-Jamroży,,
-
, Łukasz Elwirski IG
Łukasz Elwirski,,
- Institute of Geography
Journal seriesBulletin of the Geological Society of Finland, ISSN 0367-5211
Issue year2018
Noonline first
Pages1-14
Publication size in sheets0.65
Keywords in Englishdebris flow, palaeodirections, clast fabric, soft-sediment clasts, subaqueous fan, Pleistocene
URL http://www.geologinenseura.fi/bulletin/In_Press/Wozniak_etal_inpress.pdf
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa - Użycie Niekomercyjne (CC-BY-NC); with publication
Score (nominal)20
ScoreMinisterial score = 20.0, 10-05-2018, ArticleFromJournal
Ministerial score (2013-2016) = 20.0, 10-05-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 0.5 (2) - 2016=0.892 (5)
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