Paleoclimatic significance of laminated sediments on the NW Barents Sea continental margin (Arctic).

The recent depositional architecture of the north-western Barents Sea continental margin derives from past climate changes with alternating deposition of highly consolidated glacigenic diamicton and debris flows associated to shelf-edge glaciations, and low-density biogenic-rich sediments deposited...

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Bibliographic Details
Main Authors: Lucchi R. G., Musco M. E., Caricchi C., Sagnotti L., Caburlotto A., Morigi C., Princivalle F., Giorgetti G., Husum K., Laberg J. S.
Other Authors: Chiocci F.L., Budillon F., Ceramicola S., Gamberi F., Senatore M.R., Sulli A., Lucchi, R. G., Musco, M. E., Caricchi, C., Sagnotti, L., Caburlotto, A., Morigi, C., Princivalle, F., Giorgetti, G., Husum, K., Laberg, J. S.
Format: Conference Object
Language:English
Published: country:ITA 2019
Subjects:
Arctic
Barents Sea
Meltwater Pulses
Heinrich Events
ice-sheet
Svalbard
Ice Sheet
Storfjorden
Online Access:http://hdl.handle.net/11568/964243
https://doi.org/10.3301/ABSGI.2019.02
https://www.socgeol.it/files/download/pubblicazioni/Abstract%20Book/Abstract%20geologi%20marini%202019.pdf
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Summary:The recent depositional architecture of the north-western Barents Sea continental margin derives from past climate changes with alternating deposition of highly consolidated glacigenic diamicton and debris flows associated to shelf-edge glaciations, and low-density biogenic-rich sediments deposited during interglacial conditions. Sub-bottom records indicate the presence of acoustically laminated deposits locally having thickness exceeding 10 m, which lithofacies characteristics indicate deposition from turbid meltwaters (plumites) during short-living, phases of glacial retreat (meltwater pulses, MWP). One of the youngest stratigraphic intervals recognized along the NW Barents Sea margin was related to the MWP-1a that was responsible for the deposition of about 1.1 x 1011 tonnes of sediments on the upper slope of the Storfjorden-Kveithola TMFs (south of Svalbard) (Lucchi et al., 2015). New compositional analyses of such plumites revealed a distinct signature that allow us to distinguish deposition from glacial melting form that related to the ice-sheet subglacial erosion and transport to the edge of margins. Sediment facies and compositional analyses lead to a new climate-related interpretation of the laminated deposits recognized during Marine Isotopic Stages 3 and 2 on the NW margin of the Barents Sea, including Heinrich Event H2.

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