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Pedrosa, M. T
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- PublicationRestrictedPostglacial sedimentary processes on the Storfjorden and Kveithola trough mouth fans: impact of extreme glacimarine sedimentation(2013-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Lucchi, R. G.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante 42/c, I-34010 Sgonico, Trieste, Italy ;Camerlenghi, A.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante 42/c, I-34010 Sgonico, Trieste, Italy ;Rebesco, M.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante 42/c, I-34010 Sgonico, Trieste, Italy ;Colmenero-Hidalgo, E.; Department of Geology, Faculty of Sciences, University of Salamanca, E-37008 Salamanca, Spain ;Sierro, F. J.; Department of Geology, Faculty of Sciences, University of Salamanca, E-37008 Salamanca, Spain ;Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Urgeles, R.; Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, E-08003 Barcelona, Spain ;Melis, R.; Dipartimento di Geoscienze, Università di Trieste, Via E. Weiss 2, I-34128 Trieste, Italy ;Morigi, C.; Department of Stratigraphy, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K, Denmark ;Bárcena, M.-A.; Department of Geology, Faculty of Sciences, University of Salamanca, E-37008 Salamanca, Spain ;Giorgetti, G.; Dipartimento di Scienze della Terra, Università di Siena, via Laterina 8, I-53100 Siena, Italy ;Villa, G.; Dipartimento di Fisica e Scienze della Terra “Macedonio Melloni”, Parco Area delle Scienze, 157A, 43124 Parma, Italy ;Persico, D.; Dipartimento di Fisica e Scienze della Terra “Macedonio Melloni”, Parco Area delle Scienze, 157A, 43124 Parma, Italy ;Flores, J.-A.; Department of Geology, Faculty of Sciences, University of Salamanca, E-37008 Salamanca, Spain ;Rigual-Hernández, A. S.; Department of Geology, Fa ;Pedrosa, M. T.; Departament d'Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, Facultat de Geologia, C/Martí i Franquès, s/n, E-08028 Barcelona, Spain ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Caburlotto, A.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante 42/c, I-34010 Sgonico, Trieste, Italy; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; 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 3.4 cm a− 1 calculated for the plumites from the upper-slope area indicates a massive, nearly instantaneous (less than 150 years), 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.617 55 - PublicationOpen AccessMarine sedimentary record of Meltwater Pulse 1a in the NW Barents Sea continental margin(2015-11-20)
; ; ; ; ; ; ; ;Lucchi, R. G.; INOGS ;Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Camerlenghi, A.; INOGS ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Rebesco, M.; INOGS ;Pedrosa, M. T; CSIC -‐ Universidad de Granada ;Giorgetti, G.; Università di Siena; ; ; ; ; ; The upper continental slope of the Storfjorden- Kveithola Trough Mouth Fans (NW Barents Sea) contains a several m-thick late Pleistocene sequence of plumites composed of laminated mud interbedded with sand/silt layers. Radiocarbon ages revealed that deposition occurred during about 130 years at a very high sedimentation rate of 3.4 cm a-1, at about 7 km from the present shelf break. Palaeomagnetic and rock magnetic analyses confirm the existence of a prominent, short-living sedimentary event. The plumites appear laterally continuous and were correlated with the sedimentary sequences described west of Svalbard and neighboring glacial depositional systems representing a major event at regional scale appointed to correspond to the deep-sea sedimentary record of Meltwater Pulse-1a. We also present new sedimentological and geochemical insights, and multi-beam data adding information on the palaeoenvironmental characteristics during MWP-1a and ice sheet decay in the NW Barents Sea.325 396