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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