TY - JOUR
T1 - Postglacial sedimentary processes on the Storfjorden and Kveithola trough mouth fans: Significance of extreme glacimarine sedimentation
AU - Lucchi, R.G.
AU - Camerlenghi, A.
AU - Rebesco, M.
AU - Colmenero-Hidalgo, E.
AU - Sierro, F.J.
AU - Sagnotti, L.
AU - Urgeles, R.
AU - Melis, R.
AU - Morigi, C.
AU - Bárcena, M.-A.
AU - Giorgetti, G.
AU - Villa, G.
AU - Persico, D.
AU - Flores, J. A.
AU - Rigual-Hernández, A.S.
AU - Pedrosa, M.T.
AU - Macri, P.
AU - Caburlotto, A.
N1 - Funding Information:
This study was supported by the Spanish IPY projects SVAIS ( POL2006-07390/CGL ) and IPY-NICE STREAMS ( CTM2009-06370-E/ANT ), the Spanish project DEGLABAR ( CTM2010-17386 ), and the Italian projects OGS-EGLACOM , and PNRA-MELTSTORM . We thank ENI E&P Division (Milan, Italy) for the analysis with the X-ray CT scan, MARUM laboratory for the use of the XRF core-scan, and CMIMA (CSIC-Barcelona) for the analyses with multi-sensor core logger. Technical/scientific support was given by M. Guart and J. Frigola (University of Barcelona), and V. Lukes (MARUM-Bremen). We thank two anonymous reviewers and the editor T. Cronin, for critical reading of the manuscript and for suggestions that greatly improved the manuscript.
PY - 2013/12
Y1 - 2013/12
N2 - The depositional history of the Storfjorden and Kveithola trough-mouth fans (TMFs) in the northwestern Barents Sea has been investigated within two coordinated Spanish and Italian projects in the framework of the International Polar Year (IPY) Activity 367, NICE STREAMS. The investigation has been conducted using a multidisciplinary approach to the study of sediment cores positioned on high-resolution multibeam bathymetry and TOPAS/CHIRP sub-bottom profiles.Core correlation and the age model were based on 27 AMS
14C samples, rock magnetic parameters, lithofacies sequences, and the presence of marker beds including two oxidized layers marking the post Last Glacial Maximum (LGM) inception of deglaciation (OX-2) and the Younger Dryas cold climatic event (OX-1).Sediment facies analysis allowed the distinction of a number of depositional processes whose onset appears closely related to ice stream dynamics and oceanographic patterns in response to climate change. The glacigenic diamicton with low water content, high density, and high shear strength, deposited during glacial maxima, indicates ice streams grounded at the shelf edge. Massive release of IRD occurred at the inception of deglaciation in response to increased calving rates with possible outer ice streams lift off and collapse. The presence of a several-meter-thick sequence of interlaminated sediments deposited by subglacial outbursts of turbid meltwater (plumites) indicates rapid ice streams' melting and retreat. Crudely-layered and heavily-bioturbated sediments were deposited by contour currents under climatic/environmental conditions favorable to bioproductivity.The extreme sedimentation rate of 3.4cma
-1 calculated for the plumites from the upper-slope area indicates a massive, nearly instantaneous (less than 150years), terrigenous input corresponding to an outstanding meltwater event. We propose these interlaminated sediments to represent the high-latitude marine record of MeltWater Pulse 1a (MWP-1a). Different bathymetric and oceanographic conditions controlled locally the mode of glacial retreat, resulting in different thickness of plumites on the upper continental slope of the Storfjorden and Kveithola TMFs. It is possible that the southern part of Storfjorden TMF received additional sediments from the deglaciation of the neighboring Kveithola ice stream.
AB - The depositional history of the Storfjorden and Kveithola trough-mouth fans (TMFs) in the northwestern Barents Sea has been investigated within two coordinated Spanish and Italian projects in the framework of the International Polar Year (IPY) Activity 367, NICE STREAMS. The investigation has been conducted using a multidisciplinary approach to the study of sediment cores positioned on high-resolution multibeam bathymetry and TOPAS/CHIRP sub-bottom profiles.Core correlation and the age model were based on 27 AMS
14C samples, rock magnetic parameters, lithofacies sequences, and the presence of marker beds including two oxidized layers marking the post Last Glacial Maximum (LGM) inception of deglaciation (OX-2) and the Younger Dryas cold climatic event (OX-1).Sediment facies analysis allowed the distinction of a number of depositional processes whose onset appears closely related to ice stream dynamics and oceanographic patterns in response to climate change. The glacigenic diamicton with low water content, high density, and high shear strength, deposited during glacial maxima, indicates ice streams grounded at the shelf edge. Massive release of IRD occurred at the inception of deglaciation in response to increased calving rates with possible outer ice streams lift off and collapse. The presence of a several-meter-thick sequence of interlaminated sediments deposited by subglacial outbursts of turbid meltwater (plumites) indicates rapid ice streams' melting and retreat. Crudely-layered and heavily-bioturbated sediments were deposited by contour currents under climatic/environmental conditions favorable to bioproductivity.The extreme sedimentation rate of 3.4cma
-1 calculated for the plumites from the upper-slope area indicates a massive, nearly instantaneous (less than 150years), terrigenous input corresponding to an outstanding meltwater event. We propose these interlaminated sediments to represent the high-latitude marine record of MeltWater Pulse 1a (MWP-1a). Different bathymetric and oceanographic conditions controlled locally the mode of glacial retreat, resulting in different thickness of plumites on the upper continental slope of the Storfjorden and Kveithola TMFs. It is possible that the southern part of Storfjorden TMF received additional sediments from the deglaciation of the neighboring Kveithola ice stream.
KW - Barents Sea
KW - Gullies
KW - LGM
KW - Meltwater plumes
KW - MWP-1a
KW - Sedimentary processes
UR - http://www.scopus.com/inward/record.url?scp=84887563264&partnerID=8YFLogxK
U2 - 10.1016/j.gloplacha.2013.10.008
DO - 10.1016/j.gloplacha.2013.10.008
M3 - Article
SN - 0921-8181
VL - 111
SP - 309
EP - 326
JO - Global and Planetary Change
JF - Global and Planetary Change
ER -
