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TRANSCRIPT
GNGTS-2013
OGS GEOPHYSICAL STUDIES IN
STORFJORDEN AND KVEITHOLA
(BARENTS SEA)
GNGTS-2013
M. Rebesco, R.G. Lucchi, A. Caburlotto,
A. Camerlenghi, F. Zgur
GNGTS-2013
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
GNGTS-2013
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
GNGTS-2013
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
GNGTS-2013
1) Grounding Zone Wedges (GZW) and Mega Scale Glacial Lineation (MSGL) in the Kveithola trough
GNGTS-2013
Reconstruction of deglaciation stages of Kveithola after LGM
and main grounding-line processes
GNGTS-2013
Shallow landslides (LS)
buried paleo-landslides (PLS)
Rebesco et al., in press, Springer
2) Landslides, Storfjorden and Kveithola TMFs
GNGTS-2013
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
GNGTS-2013
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