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  • 1
    Description / Table of Contents: 31 July 2018 --- Geohazard assessment related to submarine instabilities in Bjørnafjorden, Norway / Brian Carlton, Maarten Vanneste, Carl Fredrik Forsberg, Siren Knudsen, Finn Løvholt, Tore Kvalstad, Søren Holm, Heidi Kjennbakken, Muhammad Adeel Mazhar, Samson Degago and Haflidi Haflidason / Geological Society, London, Special Publications, 477, 31 July 2018, https://doi.org/10.1144/SP477.39 --- Seismic and lithofacies characterization of a gravity core transect down the submarine Tuaheni Landslide Complex, NE New Zealand / Jannis Kuhlmann, Alan R. Orpin, Joshu J. Mountjoy, Gareth J. Crutchley, Stuart Henrys, Ryan Lunenburg and Katrin Huhn / Geological Society, London, Special Publications, 477, 31 July 2018, https://doi.org/10.1144/SP477.37 --- Submarine landslide catalogue onshore/offshore harmonization: Spain as a case study / Ricardo León, Juan Carlos García-Davalillo, David Casas and Carmen Julia Giménez-Moreno / Geological Society, London, Special Publications, 477, 31 July 2018, https://doi.org/10.1144/SP477.38 --- 7 June 2018 --- Surficial sediment failures due to the 1929 Grand Banks Earthquake, St Pierre Slope / Irena Schulten, David C. Mosher, Sebastian Krastel, David J. W. Piper and Markus Kienast / Geological Society, London, Special Publications, 477, 3 May 2018, https://doi.org/10.1144/SP477.25 --- 24 May 2018 --- Slope failure and mass transport processes along the Queen Charlotte Fault Zone, western British Columbia / H. Gary Greene, J. Vaughn Barrie, Daniel S. Brothers, James E. Conrad, Kim Conway, Amy E. East, Randy Enkin, Katherine L. Maier, Stuart P. Nishenko, Maureen A. L. Walton and Kristin M. M. Rohr / Geological Society, London, Special Publications, 477, 24 May 2018, https://doi.org/10.1144/SP477.31 --- Open-slope, translational submarine landslide in a tectonically active volcanic continental margin (Licosa submarine landslide, southern Tyrrhenian Sea) / M. Sammartini, A. Camerlenghi, F. Budillon, D. D. Insinga, F. Zgur, A. Conforti, M. Iorio, R. Romeo and R. Tonielli / Geological Society, London, Special Publications, 477, 24 May 2018, https://doi.org/10.1144/SP477.34 --- Morphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic / Robert Deering, Trevor Bell, Donald L. Forbes, Calvin Campbell and Evan Edinger / Geological Society, London, Special Publications, 477, 24 May 2018, https://doi.org/10.1144/SP477.35 --- 23 May 2018 --- A two-dimensional layer-averaged numerical model for turbidity currents / Shihao Yang, Yi An and Qingquan Liu / Geological Society, London, Special Publications, 477, 23 May 2018, https://doi.org/10.1144/SP477.32 --- Mass wasting along the NW African continental margin / S. Krastel, W. Li, M. Urlaub, A. Georgiopoulou, R. B. Wynn, T. Schwenk, C. Stevenson and P. Feldens / Geological Society, London, Special Publications, 477, 23 May 2018, https://doi.org/10.1144/SP477.36 --- 21 May 2018 --- Slope failure and mass transport processes along the Queen Charlotte Fault, southeastern Alaska / Daniel S. Brothers, Brian D. Andrews, Maureen A. L. Walton, H. Gary Greene, J. Vaughn Barrie, Nathan C. Miller, Uri ten Brink, Amy E. East, Peter J. Haeussler, Jared W. Kluesner and James E. Conrad / Geological Society, London, Special Publications, 477, 21 May 2018, https://doi.org/10.1144/SP477.30 --- 3 May 2018 --- Stratal architecture and evolution of a slope mass-transport complex, Isaac Formation, Neoproterozoic Windermere Supergroup, southern Canadian Cordillera, British Columbia, Canada / Lilian Navarro and R. William C. Arnott / Geological Society, London, Special Publications, 477, 3 May 2018, https://doi.org/10.1144/SP477.24 --- Sediment mass movement of a particle-laden turbidity current based on ultrasound velocity profiling and the distribution of sediment concentration / Shun Nomura, Jumpei Hitomi, Giovanni De Cesare, Yasushi Takeda, Yuzuru Yamamoto and Hide Sakaguchi / Geological Society, London, Special Publications, 477, 3 May 2018, https://doi.org/10.1144/SP477.19 --- 30 April 2018 --- Mass-wasting processes along the margins of the Ulleung Basin, East Sea: insights from multichannel seismic reflection and multibeam echosounder data / Senay Horozal, Jang-Jun Bahk, Sang Hoon Lee, Deniz Cukur, Roger Urgeles, Gil Young Kim, Seong-Pil Kim, Byong-Jae Ryu and Jin-Ho Kim / Geological Society, London, Special Publications, 477, 30 April 2018, https://doi.org/10.1144/SP477.18 --- Effects of stress on failure behaviour of shallow-marine muds from the northern Gulf of Mexico / Brandon Dugan and Xin Zhao / Geological Society, London, Special Publications, 477, 30 April 2018, https://doi.org/10.1144/SP477.13 --- Failure and post-failure analysis of submarine mass movements using geomorphology and geomechanical concepts / Jacques Locat / Geological Society, London, Special Publications, 477, 30 April 2018, https://doi.org/10.1144/SP477.27 --- Slope failures along the deformation front of the Cascadia margin: linking slide morphology to subduction zone parameters / Michael Riedel, Michelle M. Côté, Morelia Urlaub, Jacob Geersen, Nastasja A. Scholz, Kathrin Naegeli and George D. Spence / Geological Society, London, Special Publications, 477, 27 April 2018, https://doi.org/10.1144/SP477.33 --- Submarine landslides offshore Yamba, NSW, Australia: an analysis of their timing, downslope motion and possible causes / Thomas Hubble, Serena Yeung, Samantha Clarke, Alan Baxter and Fabio De Blasio / Geological Society, London, Special Publications, 477, 30 April 2018, https://doi.org/10.1144/SP477.11 --- 27 April 2018 --- Extending the terrestrial depositional record of marine geohazards in coastal NW British Columbia / David Huntley, Peter Bobrowsky, James Goff, Catherine Chagué, Douglas Stead, Davide Donati and Danial Mariampillai / Geological Society, London, Special Publications, 477, 27 April 2018, https://doi.org/10.1144/SP477.4 --- Tsunami hazard from lacustrine mass wasting in Lake Tekapo, New Zealand / Joshu J. Mountjoy, Xiaoming Wang, Susi Woelz, Sean Fitzsimons, Jamie D. Howarth, Alan R. Orpin and William Power / Geological Society, London, Special Publications, 477, 27 April 2018, https://doi.org/10.1144/SP477.21 --- 17 April 2018 --- Modelling the 1929 Grand Banks slump and landslide tsunami / Finn Løvholt, Irena Schulten, David Mosher, Carl Harbitz and Sebastian Krastel / Geological Society, London, Special Publications, 477, 17 April 2018, https://doi.org/10.1144/SP477.28 --- 28 March 2018 --- Shear margin moraine, mass transport deposits and soft beds revealed by high-resolution P-Cable three-dimensional seismic data in the Hoop area, Barents Sea / Benjamin Bellwald and Sverre Planke / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.29 --- Entrainment and abrasion of megaclasts during submarine landsliding and their impact on flow behaviour / D. M. Hodgson, H. L. Brooks, A. Ortiz-Karpf, Y. Spychala, D. R. Lee and C. A.-L. Jackson / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.26 --- Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic Margin / Jenna C. Hill, Daniel S. Brothers, Matthew J. Hornbach, Derek E. Sawyer, Donna J. Shillington and Anne Bécel / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.17 --- Repeated large-scale mass-transport deposits and consequent rapid sedimentation in the western part of the Bay of Bengal, India / Yuzuru Yamamoto, Shun Chiyonobu, Toshiya Kanamatsu, Naokazu Ahagon, Kan Aoike, Nana Kamiya, Takanori Ojima, Takehiro Hirose, Takamitsu Sugihara, Saneatsu Saito, Masataka Kinoshita, Yusuke Kubo, Yasuhiro Yamada and NGHP-02 Scientists / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.12 --- A consistent global approach for the morphometric characterization of subaqueous landslides / Michael Clare, Jason Chaytor, Oliver Dabson, Davide Gamboa, Aggeliki Georgiopoulou, Harry Eady, James Hunt, Christopher Jackson, Oded Katz, Sebastian Krastel, Ricardo León, Aaron Micallef, Jasper Moernaut, Roberto Moriconi, Lorena Moscardelli, Christof Mueller, Alexandre Normandeau, Marco Patacci, Michael Steventon, Morelia Urlaub, David Völker, Lesli Wood and Zane Jobe / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.15 --- New evidence for a major late Quaternary submarine landslide on the external western levee of Laurentian Fan / Alexandre Normandeau, D. Calvin Campbell, David J. W. Piper and Kimberley A. Jenner / Geological Society, London, Special Publications, 477, 28 March 2018, https://doi.org/10.1144/SP477.14 --- 27 March 2018 --- Assessment of the effect of mass-transport deposits on fault propagation in Penobscot area, offshore Nova Scotia / Tuviere Omeru, Samson I. Bankole, Byami A. Jolly, Obafemi S. Seyi and Joses B. Omojola / Geological Society, London, Special Publications, 477, 27 March 2018, https://doi.org/10.1144/SP477.23 --- SPLASH: semi-empirical prediction of landslide-generated displacement wave run-up heights / Thierry Oppikofer, Reginald L. Hermanns, Nicholas J. Roberts and Martina Böhme / Geological Society, London, Special Publications, 477, 27 March 2018, https://doi.org/10.1144/SP477.1 --- Evidence for surface sediment remobilization by earthquakes in the Nankai forearc region from sedimentary records / Natsumi Okutsu, Juichiro Ashi, Asuka Yamaguchi, Tomohisa Irino, Ken Ikehara, Toshiya Kanamatsu, Yusuke Suganuma and Masafumi Murayama / Geological Society, London, Special Publications, 477, 27 March 2018, https://doi.org/10.1144/SP477.22 --- 26 March 2018 --- Formation of excess fluid pressure, sediment fluidization and mass-transport deposits in the Plio-Pleistocene Boso forearc basin, central Japan / Nana Kamiya, Masayuki Utsunomiya, Yuzuru Yamamoto, Junichi Fukuoka, Feng Zhang and Weiren Lin / Geological Society, London, Special Publications, 477, 26 March 2018, https://doi.org/10.1144/SP477.20 --- 23 March 2018 --- Failure dynamics of landslide scars on the lower continental slope of the Tyrrhenian Calabrian margin: insights from an integrated morpho-bathymetric and seismic analysis / Daniele Casalbore, Eleonora Martorelli, Alessandro Bosman, Eleonora Morelli and Francesco Latino Chiocci / Geological Society, London, Special Publications, 477, 23 March 2018, https://doi.org/10.1144/SP477.16 --- Preferential formation of a slide plane in translational submarine landslide deposits in a Pleistocene forearc basin fill exposed in east-central Japan / Masayuki Utsunomiya, Atsushi Noda and Makoto Otsubo / Geological Society, London, Special Publications, 477, 23 March 2018, https://doi.org/10.1144/SP477.3 --- Bulgarian tsunami on 7 May 2007: numerical investigation of the hypothesis of a submarine-landslide origin / Oleg I. Gusev, Gayaz S. Khakimzyanov and Leonid B. Chubarov / Geological Society, London, Special Publications, 477, 23 March 2018, https://doi.org/10.1144/SP477.6 --- 6 March 2018 --- Quantitative characterization of subaqueous landslides in Lake Zurich (Switzerland) based on a high-resolution bathymetric dataset / M. Strupler, F. S. Anselmetti, M. Hilbe and M. Strasser / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.7 --- Spatial and temporal cross-cutting relationships between fault structures and slope failures along the outer Kumano Basin and Nankai accretionary wedge, SW Japan / J. K. Lackey, G. F. Moore, M. Strasser, A. Kopf and C. S. Ferreira / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.10 --- Combining in situ monitoring using seabed instruments and numerical modelling to assess the transient stability of underwater slopes / Morelia Urlaub and Heinrich Villinger / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.8 --- The nature of small to medium earthquakes along the Eastern Mediterranean passive continental margins, and their possible relationships to landslides and submarine salt-tectonic-related shallow faults / Oded Katz and Yariv Hamiel / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.5 --- Giant mass-transport deposits in the southern Scotia Sea (Antarctica) / Luis Somoza, Teresa Medialdea and Francisco J. González / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.2 --- Tsunami modelling of the 7250 cal years BP Betsiamites submarine landslide / Dominique Turmel, Jacques Locat, Jonathan Leblanc and Geneviève Cauchon-Voyer / Geological Society, London, Special Publications, 477, 6 March 2018, https://doi.org/10.1144/SP477.9
    Edition: online first
    Language: English
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  • 2
    Publication Date: 2016-03-02
    Description: :  Backstepping cross-strata on steep foresets of a Gilbert-type proglacial fluviodeltaic system are ascribed to cyclic steps and other associated supercritical bedforms. They provide insight into how sandur river flows transition into the marine realm. These sedimentary structures are located on steep foresets (up to 17°) with corresponding top-lying, flat-based topsets in an upper Pleistocene delta on the North Shore of the Gulf of St. Lawrence, Québec, Canada. Packages of backstepping cross strata of sand and gravel, lying in the lower part of the delta front outcrop, are organized in 10–20 m spaced pseudo-foresets with a mean slope of 11–12° seawards. Backstepping strata include frequent internal erosion surfaces that onlap upslope on pseudo-foresets and are interpreted as cyclic steps. Narrow, deep, and asymmetrical scours and upslope-climbing cross beds are interpreted as chutes-and-pools and antidunes respectively. Very shallow (〈 15 m) depositional paleo-bathymetry is inferred from the preservation of the delta brink. The well-organized stratal pattern in cyclic step to antidune deposits indicates relatively steady and uniform flow patterns. There is insufficient distance for a headscarp large enough to transform to the volume of observed accreted sands or for a flow transformation from a gravitational collapse to net-depositional cyclic steps. These deposits are sandier than the topsets beds and are thus not derived from them, but rather correspond to topset erosional surfaces. The development of cyclic steps from hyperpycnal flows was likely enhanced by tidal drawdown processes. The resulting sediment-laden supercritical flows plunged inertially and evolved into an underflow that generated the cyclic steps on the upper foresets. The cyclic steps have a high aspect ratio and represent an end member of coarse-grained sediment deposited on steep slopes, in contrast to low-gradient, low-aspect-ratio muddy deposits.
    Print ISSN: 1527-1404
    Topics: Geosciences
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  • 3
    Publication Date: 2016-08-10
    Description: High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here, for the first time in the Canadian High Arctic, we present original data resulting from swath bathymetry and sub-bottom surveys carried out on two lakes at Cape Bounty, Melville Island. The results reveal the dynamic nature of the lakes, in which mass movements deposits and bedforms on the deltas reflect frequent slope instabilities and hyperpycnal flow activity. The analysis of the mass movement deposits reveals that small blocky debris flows/avalanches, debris flows and a slide occurred during the Holocene. These mass movements are believed to have been triggered by earthquakes and potentially by permafrost thawing along the shoreline. Altogether, these mass movement deposits cover more than 30% of the lake floors. Additionally, the river deltas on both lakes were mapped and reveal the presence of several gullies and bedforms. The presence of gullies along the delta front indicates that hyperpycnal flows generated at the river mouth can transport sediment in different trajectories downslope, resulting in a different sediment accumulation pattern and record. The dynamic nature of these two lakes suggests that further analysis on sediment transport and distribution within Arctic lakes is required in order to improve paleoclimatic reconstructions.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
    Publication Date: 2018-06-27
    Description: Swath bathymetry data and seismic profiles collected in the NW Gulf of St Lawrence reveal a series of wedge-shaped depositional systems interpreted as grounding zone wedges (GZWs). Some segments of the GZWs change locally to form frontal moraines, or morainal banks, and subaqueous ice-contact fans, reflecting changes in either the nature of the ice margin or the rate of sediment input. These grounding zones (GZ) of the ice margin extend laterally along three isobaths at depths of 180 (GZ1), 120 (GZ2) and 80 (GZ3) m (±20 m) along the Québec North Shore shelf, the 120 m-deep GZ2 system being traceable over a distance of 〉300 km. Associated GZWs can occur in three geometries along a same isobath system: curvilinear, lobate and shelf-break. GZ systems were built during three distinct stages of stabilization of the marine-based southeastern margin of the Laurentide Ice Sheet following its rapid retreat across the deeper waters of the Laurentian Channel in the Gulf of St Lawrence after 14.8 cal ka BP. The occurrence of GZ along distinct isobaths indicates that bathymetry exerted a strong control on ice stabilization during deglaciation by reducing the relative water depth at the ice margin and thereby the buoyancy and rate of iceberg calving. However, fluctuations and re-advances of the ice margin are also recorded by the overprinting of a portion of the GZ2 system by the younger GZ3 system, potentially suggesting an additional response to climate-driven forcing.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 5
    Publication Date: 2018-05-15
    Description: Deglacial sedimentary sequences recording the decay and final demise of ice sheets result from intricate interactions between the pattern of ice margin retreat, inherited basin physiography and relative sea-level (RSL) changes. A specific emphasis is here given to the glacio-isostatic adjustment (GIA), which may force postglacial local RSL fall in spite of concomitant glacio-eustatic rise. In this contribution, we characterize a Quaternary deglacial succession emplaced in such a setting, subsequently used as an analogue to interpret an end-Ordovician deglacial record. The Quaternary deglacial succession, tens of metres thick, formed under condition of RSL fall forced by the GIA in c. 10 000 years in the aftermath of the deglaciation. This sedimentary succession consists of a lower, fining-upward sequence representing the backstepping of ice-contact depocentres following the retreat of the ice margin, and an upper, coarsening-upward sequence that relates to the subsequent progradation of a glaciofluvial delta system. A very similar stratigraphic stacking pattern characterizes the Ordovician analogue, suggesting a comparable deglacial sequence. By analogy with the Quaternary succession, this ancient deglacial record would have hence been emplaced under conditions of RSL fall forced by the GIA. Moreover, it must only represent a very short time interval that could be viewed as virtually instantaneous regarding the Late Ordovician glaciation. Such a vision is at odds with commonly accepted interpretations for such successions.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 6
    Publication Date: 2014-02-27
    Description: The geomorphology, geometry, and sedimentary infill of buried gorges and V-shaped valleys observed at the base of major river valleys in the formerly glaciated southeastern Canadian Shield region have been revealed from excavation and drilling data acquired during the construction of hydro-electric dams and seismic data collected on lakes and offshore. Compilation of these previously published and unpublished data provided an exceptional opportunity to examine the morphology and spatial distribution of buried bedrock gorges and the mechanical processes responsible for their erosion. In some valleys, detailed observations of deep gorges have been allowed by their exhumation over large areas. Archive photographs show deep and large potholes, natural pillars, furrows, flutes, and scallops on the well-polished bedrock walls of the gorges. They also reveal that gorges and valleys have a sharp-ending V shape and very narrow base and are superimposed by a U-shaped valley, forming a buried valley-within-valley topography. The narrow and deep cross-profile of these gorges, their well-polished slopes, and the type of bedforms observed within them are typical features of fluvial bedrock channels. Drilling operations at many sites have also provided data on bedrock topography of these gorges within valleys and on the nature of their sedimentary infill. The different lines of evidence presented in this paper indicate that gorges and V-shaped valleys of the region were not eroded by the Laurentide Ice Sheet during Quaternary glaciations but are relics of a preserved preglacial fluvial system eroded during a lower base level. This paleofluvial system is interpreted to be linked to fluvially cut channels observed on the seafloor of the Estuary and Gulf of St. Lawrence.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
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  • 7
    Publication Date: 2017-10-14
    Description: The nature of glaciomarine sediments deposited during ice margin retreat can vary according to physiographic setting and relative sea level fluctuations. To understand the effects of these two parameters on sedimentation, we analyzed the sediment records of four lakes located within former isolated glaciomarine embayments of the northern Champlain Sea basin. These lakes were initially inundated by marine water of the Champlain Sea, following deglaciation, and have subsequently experienced basin isolation owing to glacio-isostatic rebound. Three of these lakes reveal a common litho- and acoustic stratigraphic succession, characterized by an IRD-free glaciomarine to marine facies consisting of homogeneous to faintly laminated clayey silts grading into well-laminated silts with rapidly deposited layers. These two units recorded the transitional environment from glaciomarine sedimentation below multiyear shorefast ice to increased terrestrial runoff and rapid glacio-isostatic rebound once the ice margin retreated inland. During ice margin retreat, relative sea level fell concomitantly resulting in the deposition of coarser sediments in marine embayments. Upon the complete retreat of the ice margin, the supply of terrestrial sediments diminished and lake isolation, driven by relative sea level fall, led to higher biogenic content and increased bioturbation. This study provides a framework for sedimentation in isolated glaciomarine embayments which differs from deep-water sedimentation owing to the presence of shorefast sea-ice and their protected location from major ice-stream outlets.
    Print ISSN: 0008-4077
    Electronic ISSN: 1480-3313
    Topics: Geosciences
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  • 8
    Publication Date: 2018
    Description: 〈p〉Deglacial sedimentary sequences recording the decay and final demise of ice sheets result from intricate interactions between the pattern of ice margin retreat, inherited basin physiography and relative sea-level (RSL) changes. A specific emphasis is here given to the glacio-isostatic adjustment (GIA), which may force postglacial local RSL fall in spite of concomitant glacio-eustatic rise. In this contribution, we characterize a Quaternary deglacial succession emplaced in such a setting, subsequently used as an analogue to interpret an end-Ordovician deglacial record. The Quaternary deglacial succession, tens of metres thick, formed under condition of RSL fall forced by the GIA in 〈i〉c.〈/i〉 10 000 years in the aftermath of the deglaciation. This sedimentary succession consists of a lower, fining-upward sequence representing the backstepping of ice-contact depocentres following the retreat of the ice margin, and an upper, coarsening-upward sequence that relates to the subsequent progradation of a glaciofluvial delta system. A very similar stratigraphic stacking pattern characterizes the Ordovician analogue, suggesting a comparable deglacial sequence. By analogy with the Quaternary succession, this ancient deglacial record would have hence been emplaced under conditions of RSL fall forced by the GIA. Moreover, it must only represent a very short time interval that could be viewed as virtually instantaneous regarding the Late Ordovician glaciation. Such a vision is at odds with commonly accepted interpretations for such successions.〈/p〉
    Print ISSN: 0375-6440
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 9
    Publication Date: 2018
    Description: 〈p〉Swath bathymetry data and seismic profiles collected in the NW Gulf of St Lawrence reveal a series of wedge-shaped depositional systems interpreted as grounding zone wedges (GZWs). Some segments of the GZWs change locally to form frontal moraines, or morainal banks, and subaqueous ice-contact fans, reflecting changes in either the nature of the ice margin or the rate of sediment input. These grounding zones (GZ) of the ice margin extend laterally along three isobaths at depths of 180 (GZ1), 120 (GZ2) and 80 (GZ3) m (±20 m) along the Québec North Shore shelf, the 120 m-deep GZ2 system being traceable over a distance of 〉300 km. Associated GZWs can occur in three geometries along a same isobath system: curvilinear, lobate and shelf-break. GZ systems were built during three distinct stages of stabilization of the marine-based southeastern margin of the Laurentide Ice Sheet following its rapid retreat across the deeper waters of the Laurentian Channel in the Gulf of St Lawrence after 14.8 cal ka BP. The occurrence of GZ along distinct isobaths indicates that bathymetry exerted a strong control on ice stabilization during deglaciation by reducing the relative water depth at the ice margin and thereby the buoyancy and rate of iceberg calving. However, fluctuations and re-advances of the ice margin are also recorded by the overprinting of a portion of the GZ2 system by the younger GZ3 system, potentially suggesting an additional response to climate-driven forcing.〈/p〉
    Print ISSN: 0375-6440
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 10
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