An Early Pleistocene grounded ice sheet in the Central North Sea

Buckley, Francis

doi:10.1144/sp368.8

Cited by 19 publications

(30 citation statements)

References 37 publications

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“…Sedimentation rates for the Quaternary were calculated from sediment thickness maps between the four seismic stratigraphical packages (2.58 -2.35, 2.35 -1.94, 1.94 -1.1 and 1.1 Ma to present Nielsen et al (2008); Buckley (2012Buckley ( , 2017; Ottesen et al (2014) and Thöle et al (2014). mbsf, metres below seafloor; n.a., not analysed.…”

Section: Methodsmentioning

confidence: 99%

“…For comparison, the basal Quaternary as defined at Josephine-1 by Knudsen & Asbjörnsdóttir (1991) and correlated to the 'crenulate reflector' by Buckley (2012Buckley ( , 2017 using the first occurrence of benthic foraminifera species Cibicides grossus, was also mapped across the dataset. C. grossus was identified as a marker species for the North Sea by King (1983), who calibrated C. grossus and its related species Elphidiella hannai to the Gauss-Matuyama Reversal, and hence the 2.58 Ma boundary.…”

Section: Chronostratigraphic Calibrationmentioning

confidence: 99%

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The early Quaternary North Sea Basin

Lamb

Harding

Huuse

et al. 2017

JGS

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The onset of the Quaternary (2.58 Ma) corresponds to significant paleo-environmental events, such as the intensification and southward extension of Northern Hemisphere glaciation. In the North Sea Basin a significant late Cenozoic succession has been identified as a high-resolution archive of paleo-environmental changes during the Pliocene and Pleistocene. However, the identification of the base of the Quaternary has been a long-standing issue owing to lack of stratigraphic calibration. This study incorporates continuous, regional 3D seismic data with high-quality chronostratigraphic markers to map the base-Quaternary surface at high resolution across the entire North Sea. Depth conversion, backstripping, seismic geomorphology and sedimentation rate calculations are integrated to analyse the paleogeographical evolution of the North Sea Basin and its infill of c. 83 × 10 3 km 3 of northward prograding marine to deltaic sediments. The basin is 600 km long from SSE to NNW and largely localized above residual topography of the Mesozoic graben system. During the earliest Quaternary (2.58 -2.35 Ma) paleo-water depths were c. 300 ± 50 m and solid sedimentation rates (calculated from 0% porosity) c. 32 km 3 ka −1 . The base-Quaternary provides an important marker for further studies of the changing environment of the Quaternary of NW Europe as well as resource and shallow geohazard analysis.Supplementary material: A base Quaternary two-way travel time structure map is available at https://doi.org/10.6084/m9. figshare.c.3900343

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Section: Methodsmentioning

confidence: 99%

Section: Chronostratigraphic Calibrationmentioning

confidence: 99%

The early Quaternary North Sea Basin

Lamb

Harding

Huuse

et al. 2017

JGS

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“…Spectacular glacioterrestrial and glaciomarine successions occur across northern Europe, from the north European plains of Poland, Germany, Denmark, the Netherlands and eastern England (Ehlers et al 2011), and along the Atlantic continental margin (Dowdeswell et al 2002;Ottesen et al 2008Ottesen et al , 2012 through to the North Sea, where these glacial sequences are superbly imaged on highresolution 3D seismic data (e.g. Praeg 2003; Rise et al 2004;Graham et al 2010;Kristensen et al 2007;Buckley 2012). These seismic data facilitate the mapping of regional-scale, glaciogenic unconformities offshore , while the spectacular outcrops of well-preserved and welldated Pleistocene sediments onshore, in areas such as in western Denmark (e.g.…”

Section: Cenozoicmentioning

confidence: 99%

“…Numerous examples are clearly imaged on seismic reflection data from the North Sea (Fig. 9;Praeg 2003;Buckley 2012;Andersen et al 2012;Kristensen & Huuse 2012;Moreau et al 2012;Müther et al 2012;Stewart et al 2012). Some studies suggest that the tunnel valleys are incised preferentially into low-permeability clays, because high-transmissivity substrates such as sand and gravel with high porosities and permeabilities would retard the incision process (Huuse & Lykke-Andersen 2000a;Janszen et al 2012b;Sandersen & Jør-gensen 2012).…”

Section: Cenozoicmentioning

confidence: 99%

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Glaciogenic reservoirs and hydrocarbon systems: an introduction

Huuse

Heron

Dixon

et al. 2012

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Glaciogenic reservoirs host important hydrocarbon and groundwater resources across the globe. Their complexity and importance for exploration and palaeoclimate reconstruction have made glaciogenic successions popular subjects for study. In this paper we provide an overview of the palaeoclimatic and tectonic setting for Earth glaciation and a chronological account of glaciogenic deposits since c. 750 Ma, with particular emphasis on their reservoir potential and associated hydrocarbon systems. Hydrocarbon accumulations within glaciogenic reservoirs occur principally in Palaeozoic (Late Ordovician and Permo-Carboniferous) sandstones in South America, Australia, North Africa and the Middle East, with relatively minor occurrences of shallow gas hosted in Pleistocene deposits in the North Sea and Canada. Groundwater reserves occur within glaciogenic sandstones across the northern European lowland and in North America. The main glaciogenic environments range from subglacial to glacier front to proglacial and deglacial. Rapidly changing environments, hydrodynamic regimes and glacier-front and subglacial deformation often result in very complex glaciogenic sequences with significant challenges for reconstruction of their origin and resource importance, which this volume seeks to address.

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Deeply rooted glaciotectonism in western Denmark: geological composition, structural characteristics and the origin of Varde hill‐island

Høyer

Jørgensen

Piotrowski

et al. 2013

J Quaternary Science

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We investigate a hill-island in western Denmark, a major cupola-hill-type thrust complex generated by ice-marginal glaciotectonism. The study uses a unique dataset of densely spaced airborne electromagnetic data, high-resolution seismic data and borehole information to document the complexity of deeply rooted thrust sheets comprising Miocene to middle Pleistocene deposits. The deformation spans at least 150 m of sediment thickness, placing this complex among the largest glaciotectonic features on record. The main stages of formation of the hillisland were (1) erosion of Miocene deposits by subglacial tunnel valleys and infill of these valleys in the preElsterian and Elsterian time, (2) two phases of glaciotectonic thrusting during the Saalian glaciation, (3) erosion by the Saalian ice sheet removing a significant part of the thrust complex and (4) periglacial and postglacial erosion of the hill-island excavating the glaciotectonic elements. Palaeoglaciological calculations suggest that the Saalian ice sheet that caused the thrusting was thick, had a steep profile, rested on a permafrost wedge and moved slowly, which contrasts with the highly mobile, thin ice lobes of the Last Glaciation.

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An Early Pleistocene grounded ice sheet in the Central North Sea

Abstract: Evidence is presented for an Early

Cited by 19 publications

References 37 publications

The early Quaternary North Sea Basin

The early Quaternary North Sea Basin

Glaciogenic reservoirs and hydrocarbon systems: an introduction

Deeply rooted glaciotectonism in western Denmark: geological composition, structural characteristics and the origin of Varde hill‐island

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