GNGTS-2013

OGS GEOPHYSICAL STUDIES IN

STORFJORDEN AND KVEITHOLA

(BARENTS SEA)

GNGTS-2013

M. Rebesco, R.G. Lucchi, A. Caburlotto,

A. Camerlenghi, F. Zgur

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Main Objective:

Geologic- geophysical study of an ice-stream dominated

depositional system to reconstruct:

Laberg et al, in prep.

-The evolution of this Arctic margin since the onset

of glaciation (Pliocene) to the last deglaciation

STRATAGEM, 2002

- Continental slope instability phenomena

GNGTS-2013

IPY Activity 367 NICE-STREAMS (Neogene ice streams and sedimentary processes on high-latitude continental margins)

http://sites.google.com/site/ipynicestreams/

SVAIS

2007

P.I. A. Camerlenghi

ICREA, Spain

BIO Hespérides

EGLACOM

2008

P.I. M. Rebesco

OGS, Italy

R/V OGS-Explora

R/V Jan Mayen

GLACIBAR

2009

P.I. K. Andreassen

University of Tromsø,

Norway

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SVAIS+EGLACOM data

25.300 km2 mutibeam bathymetry 7.400 km sub–bottom echo-sounder profiles 1.598 km high resolution seismic reflection profiles 10 sediment cores 40 m of sediments

EGLACOM + GLACIBAR

bathymetry

GNGTS-2013

1,200 m long digital streamer;

96 channels (spaced 12.5 m);

160 cubic inches array of sleeve guns;

fold coverage = 24;

shot interval = 25 m;

sampling rate = 1 ms;

processing included a t-squared scaling for spherical

divergence correction, MCS spike deconvolution, time-

varying band-pass filtering, trace equalisation;

integrated interpretation of using Kingdom Suite software.

R/V OGS-Explora EGLACOM

2008 cruise

multichannel seismic survey

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GLACIBAR data (University of Tromsø)

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Four main themes developed though the integration of geophysical, geological and oceanographic investigation: 1) GZW and MSGL in the Kveithola trough

2) Landslides, Storfjorden and Kveithola TMFs

3) TMF development, Storfjorden, Hornsund,

Bellsund TMFs

4) Contourites, Isfjorden and Bellsund Drifts

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1) Grounding Zone Wedges (GZW) and Mega Scale Glacial Lineation (MSGL) in the Kveithola trough

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Reconstruction of deglaciation stages of Kveithola after LGM

and main grounding-line processes

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Shallow landslides (LS)

buried paleo-landslides (PLS)

Rebesco et al., in press, Springer

2) Landslides, Storfjorden and Kveithola TMFs

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Submarine landslides (LS)

Lucchi et al., in press; Rebesco et al., in press, Springer

Slope: <2°; scars: 5º-7º to > 10°

>30 m head-walls

LS-1 >1,100 km2 to >3,000 km2

SV05

25 km

GNGTS-2013

Reflector-age (Ma)

R1-0.2 R2-0.4 R3-0.75 R4-1.1 R4A-1.3 R5-1.5 R6-2.1

Multichannel seismic reflection providing

a nearly 400 km long continuous alongslope tie

3) TMF development

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IBCAO

4) Sediment drifts

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(modified from Beszczynska-Möller et al, 2012)

moorings

CTD sections

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Lucchi et al., 2013. Global and Planetary Change 111, 309-326.

Rebesco et al., 2013. Quaternary Science Reviews, in press

Rebesco et al., 2013. Deep Sea Research Part I: Oceanographic Research Papers 79,

156-168.

Bjarnadóttir et al., 2013. Boreas 42, 84-107.

Rüther et al., 2012. Boreas 41, 494-512.

Lucchi et al., 2012., Submarine Mass Movements and Their Consequences, Advances in

Natural and Technological Hazards Research, Springer Science book series 31, 735-745.

Rebesco et al., 2012. Submarine Mass Movements and Their Consequences, Advances

in Natural and Technological Hazards Research, Springer Science book series 31, 747-756.

Sagnotti et al., 2011. Geochemistry, Geophysics, Geosystems 12, Q11Z33.

Rebesco et al., 2011. Marine Geology 279, 141-147.

Pedrosa et al., 2011. Marine Geology 286, 65-81.

What Next... CORIBAR 5-nations’ project to study the Kveithola depositional system

Eurofleets2 project PREPARED to study the sediment drifts west of Svalbard

GNGTS-2013

Thanks for your attention