Lake Floor Morphology and Sediment Architecture of Lake Torneträsk, Northern Sweden

Vogel, Hendrik; Wagner, Bernd; Rosén, Peter (2013). Lake Floor Morphology and Sediment Architecture of Lake Torneträsk, Northern Sweden. Geografiska annaler. Series A - physical geography, 95(2), pp. 159-170. Wiley-Blackwell 10.1111/geoa.12006

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ABSTRACT. Here we present datasets from a hydroacoustic
survey in July 2011 at Lake Torneträsk, northern Sweden.
Our hydroacoustic data exhibit lake floor morphologies
formed by glacial erosion and accumulation processes,
insights into lacustrine sediment accumulation since the
beginning of deglaciation, and information on seismic activity
along the Pärvie Fault. Features of glacial scouring with
a high-energy relief, steep slopes, and relative reliefs of more
than 50 m are observed in the large W-basin. The remainder
of the lacustrine subsurface appears to host a broad variety of
well preserved formations from glacial accumulation related
to the last retreat of the Fennoscandian ice sheet. Deposition
of glaciolacustrine and lacustrine sediments is focused in
areas situated in proximity to major inlets. Sediment accumulation
in distal areas of the lake seldom exceeds 2 m or is
not observable. We assume that lack of sediment deposition
in the lake is a result of different factors, including low rates
of erosion in the catchment, a previously high lake level
leading to deposition of sediments in higher elevated paleodeltas,
tributaries carrying low suspension loads as a result
of sedimentation in upstream lakes, and an overall low productivity
in the lake. A clear off-shore trace of the Pärvie
Fault could not be detected from our hydroacoustic data.
However, an absence of sediment disturbance in close proximity
to the presumed fault trace implies minimal seismic
activity since deposition of the glaciolacustrine and lacustrine
sediments.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Vogel, Hendrik

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0435-3676

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Hendrik Vogel

Date Deposited:

19 Jun 2014 09:34

Last Modified:

06 Oct 2015 13:21

Publisher DOI:

10.1111/geoa.12006

URI:

https://boris.unibe.ch/id/eprint/45274

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