Geophysical investigation of buried Pleistocene subglacial valleys in Northern Germany

Gabriel, Gerald; Kirsch, R.; Siemon, B.; Wiederhold, H.

doi:10.1016/j.jappgeo.2003.08.005

Cited by 87 publications

(68 citation statements)

References 12 publications

(15 reference statements)

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“…Very localised, fresh groundwater discharge occurs, for example, near Sahlenburg (cf. Gabriel et al 2003) or near the island of Sylt (cf. Zipperle and Reise 2005).…”

Section: Study Areasmentioning

confidence: 99%

“…Somewhat unrelated to the large-scale trends are the long-lived Ra isotope activities in our fresh groundwater, which originates from an aquifer related to a buried valley from a past glacial period (Gabriel et al 2003 Moore et al 1995), the absolute magnitude of Ra activities in the open North Sea is distinctly smaller. At a distance of 60 km offshore, only a negligible activity of short-lived Ra was measured, whereas in the Amazon shelf and the Gulf of Mexico, the decrease of the coastal Ra signal could be followed over tens to hundreds of kilometres.…”

mentioning

confidence: 99%

See 1 more Smart Citation

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

et al. 2011

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“…Very localised, fresh groundwater discharge occurs, for example, near Sahlenburg (cf. Gabriel et al 2003) or near the island of Sylt (cf. Zipperle and Reise 2005).…”

Section: Study Areasmentioning

confidence: 99%

mentioning

confidence: 99%

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

et al. 2011

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“…However, the majority of studies to date have focused on the use of gravity (e.g., Greenhouse and Monier-Williams 1986;Gabriel et al 2003;Gabriel 2006;Møller et al 2007;Zweirs et al 2008;Bajc and Rainsford 2010;Burt and Rainsford 2010), which exploits changes in subsurface bulk density and ground and airborne transient electromagnetic methods (e.g., Jørgensen et al 2003aJørgensen et al , 2003bJørgensen et al , 2013Sørensen and Auken 2004;Steuer et al 2009;Høyer et al 2015;Oldenborger et al 2016). While gravity methods can be highly effective in mapping changes in bedrock elevation, they provide limited insight about Quaternary infill and architecture, and are frequently accompanied by significant uncertainty in the true bedrock elevation in the absence of borehole logs.…”

Section: Geophysical Investigations Of Buried Valleysmentioning

confidence: 99%

“…Studies utilizing multiple geophysical methods combined with geologic and hydrogeologic data are particularly effective for 3D mapping of hydrostratigraphic units (e.g., Gabriel et al 2003;Jørgensen et al 2003aJørgensen et al , 2003bSteuer et al 2009; Stumpf and Ismail 2013;Cassidy et al 2014;Sapia et al 2014). In Ontario, shallow seismic reflection, gravity, and electromagnetic surveys have been used at mostly regional scales to delineate the nature of the infilled sediment and bedrock valley geometry (e.g., Greenhouse and Monier-Williams 1986;Greenhouse and Karrow 1994;Zweirs et al 2008;Burt 2011;Bajc et al 2012;Pugin et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Geophysical, geological, and hydrogeological characterization of a tributary buried bedrock valley in southern Ontario

et al. 2018

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Buried bedrock valleys infilled with Quaternary-aged sediment have the potential to become productive aquifers owing to prevalent sand and gravel deposits often associated with these topographic lows. In areas where groundwater is drawn from the underlying bedrock aquifer, buried bedrock channels may significantly affect the spatial distribution of recharge and localized contaminant pathways. Therefore, understanding the form, distribution, and the nature of Quaternary infill sediments within these buried bedrock river valleys, and their relationship to hydraulically transmissive bedrock features is an important aspect of groundwater resource management. Here, we evaluate the effectiveness of electrical resistivity and seismic refraction collected over a partially urbanized 150 ha area with variable vegetation, roads, and structures, to map the spatial distribution of sediments and delineation of a channel segment associated with a regional bedrock valley. Electrical resistivity and seismic refraction was performed along 13 (covering ϳ11.6 km) and seven transects (covering ϳ0.9 km), respectively, to map and characterize the bedrock surface morphology beneath a variable thickness of unconsolidated deposits. Three continuously cored holes and downhole geophysical logs, supplemented with four nearby water well records captured the in-channel as well as adjacent Quaternary stratigraphy (ϳ15-40 m). Cores recorded multiple glacial till deposits and ice-marginal processes associated with ice advances and retreats. Hydraulic transmissivity of the bedrock around the valley feature was evaluated using a FLUTe hydraulic transmissivity profiling technique. This study demonstrates the potential of combining several surface geophysical methods with sedimentological analysis of continuous cores and hydraulic data for characterizing tributary bedrock channel morphology and Quaternary infill at a scale relevant to localized studies of municipal production well recharge zones and contaminant transport and fate.Résumé : Les vallées ensevelies taillées dans le roc remplies de sédiments d'âge quaternaire ont le potentiel de devenir des aquifères productifs en raison des importants dépôts de sable et de gravier souvent associés à ces dépressions topographiques. Dans les régions où l'eau souterraine est tirée de l'aquifère rocheux sous-jacent, les chenaux ensevelis taillés dans le roc pourraient avoir une importante incidence sur la répartition spatiale de la recharge et des voies de propagation des contaminants. La compréhension de la forme, de la répartition et de la nature des sédiments quaternaires qui remplissent ces vallées fluviales ensevelies et leur lien avec des caractéristiques du substrat rocheux transmissif est un aspect important de la gestion des ressources d'eau souterraine. Nous évaluons l'efficacité des méthodes de résistivité électrique et de sismique réfraction utilisées dans une zone partiellement urbanisée de 150 ha présentant une répartition variable de la végétation, des routes et des ouvrages, pour c...

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“…Ground-penetrating radar studies of eskers, push moraines and outwash deposits yield amazingly detailed images on an outcrop scale (Bakker & van der Meer 2003;Winsemann et al 2009). Because of the cost and impracticalities of acquiring reflection seismic data in populated onshore areas, and because of the ability of electromagnetic and electrical methods to image resistivity changes between sands and clays and salinity changes in groundwater, potential field and electromagnetic methods, in particular using airborne electromagnetic equipment, have been employed with impressive results to locate groundwater reserves hosted in tunnel valleys (Danielsen et al 2003;Gabriel et al 2003;Jørgen-sen & Sandersen 2006;Kehew et al 2012;Sandersen & Jørgensen 2012). Potential field methods have also been used offshore where high-pass or gradient processed gravity and aero-magnetic data sets can yield spectacularly continuous images of nearsurface tunnel valley systems (Olesen et al 2010).…”

Section: Geophysical Imaging Of Glaciogenic Reservoirsmentioning

confidence: 99%

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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Geophysical investigation of buried Pleistocene subglacial valleys in Northern Germany

Cited by 87 publications

References 12 publications

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

Geophysical, geological, and hydrogeological characterization of a tributary buried bedrock valley in southern Ontario

Glaciogenic reservoirs and hydrocarbon systems: an introduction

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