Genesis of a giant gravity-induced depression (gravifossum) in the Enköping esker, S. Sweden

Gruszka, Beata; Loon, A.J. van

doi:10.1016/j.sedgeo.2010.10.004

Cited by 22 publications

(12 citation statements)

References 27 publications

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“…The graben‐like deformation structure noted in the base of unit II is interpreted as a gravifossum (gravity‐induced elongated depression). Similar structures have been described by van Loon and Wiggers (1976) and van Loon (1992, 2009) from lagoonal subrecent sediments in The Netherlands, and by Brodzikowski and van Loon (1979) and Gruszka and van Loon (2011) from glaciogenic deposits. The Cieśle graben‐like deformation probably formed as a result of subsidence due to ongoing melting of an underlying, buried ice float in combination with gradual loading due to aggradation of unit II.…”

supporting

confidence: 82%

“…and by Brodzikowski and van Loon (1979) and Gruszka and van Loon (2011) from glaciogenic deposits. The Cieśle graben-like deformation probably formed as a result of subsidence due to ongoing melting of an underlying, buried ice float in combination with gradual loading due to aggradation of unit II.…”

Section: Specific Erosional and Depositional Processes In A Pleistocementioning

confidence: 71%

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Specific erosional and depositional processes in a pleistocene subglacial tunnel in the wielkopolska region, poland

Pisarska‐Jamroży

Zieliński

2012

Geografiska Annaler: Series A, Physical Geography

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The Pleistocene Cieśle succession accumulated in a subglacial tunnel and shows three sedimentological units: (1) trough cross‐stratified sand with granules deposited in deep channels up to 5.4 m, (2) trough stratified and massive gravels deposited in a very deep channel up to 6.2 m eroded by a catastrophic hyperconcentrated flow, and (3) a massive diamicton, interpreted as a basal till of melt‐out type. We focus on angular and deformed sandy clasts that occur in the second unit. It appears that thermal erosion, short transport in a sediment‐laden current and sudden sedimentation were responsible for the oversized sandy clasts that occur in the gravel glaciofluvial deposits. The deposits are characterized by large‐scale erosional scours, massive structure, and fluid‐escape deformations. This combination of features can be used as a key tool for the interpretation of hyperconcentrated‐flow conditions beneath Pleistocene ice sheets.

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supporting

confidence: 82%

Section: Specific Erosional and Depositional Processes In A Pleistocementioning

confidence: 71%

Specific erosional and depositional processes in a pleistocene subglacial tunnel in the wielkopolska region, poland

Pisarska‐Jamroży

Zieliński

2012

Geografiska Annaler: Series A, Physical Geography

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“…Localized and intense deformation, including structures such as thrust faults, asymmetrical folds, clastic dykes and normal faults, associated with intense and deep scouring, are related to the association of ductile and brittle deformation. Melting of buried ice and subsequent downwarping may be responsible for the emplacement of collapsed structures, step normal faults and convolute bedding (Gruszka & van Loon, 2011). However, thrust faults and folds are not structures that are consistent with processes of deformation induced by melting of buried ice because they indicate sediment compression.…”

Section: Discussionmentioning

confidence: 99%

Sedimentological and deformational criteria for discriminating subglaciofluvial deposits from subaqueous ice‐contact fan deposits: A Pleistocene example (Ireland)

et al. 2014

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A pit located near Ballyhorsey, 28 km south of Dublin (eastern Ireland), displays subglacially deposited glaciofluvial sediments passing upwards into proglacial subaqueous ice‐contact fan deposits. The coexistence of these two different depositional environments at the same location will help with differentiation between two very similar and easily confused glacial lithofacies. The lowermost sediments show aggrading subglacial deposits indicating a constrained accommodation space, mainly controlled by the position of an overlying ice roof during ice‐bed decoupling. These sediments are characterized by vertically stacked tills with large lenses of tabular to channelized sorted sediments. The sorted sediments consist of fine‐grained laminated facies, cross‐laminated sand and channelized gravels, and are interpreted as subglaciofluvial sediments deposited within a subglacial de‐coupled space. The subglaciofluvial sequence is characterized by glaciotectonic deformation structures within discrete beds, triggered by fluid overpressure and shear stress during episodes of ice/bed recoupling (clastic dykes and folds). The upper deposits correspond to the deposition of successive hyperpycnal flows in a proximal proglacial lake, forming a thick sedimentary wedge erosively overlying the subglacial deposits. Gravel facies and large‐scale trough bedding sand are observed within this proximal wedge, while normally graded sand beds with developed bedforms are observed further downflow. The building of the prograding ice‐contact subaqueous fan implies an unrestricted accommodation space and is associated with deformation structures related to gravity destabilization during fan spreading (normal faults). This study facilitates the recognition of subglacial/submarginal depositional environments formed, in part, during localized ice/bed coupling episodes in the sedimentary record. The sedimentary sequence exposed in Ballyhorsey permits characterization of the temporal framework of meltwater production during deglaciation, the impact on the subglacial drainage system and the consequences on the Irish Sea Ice Stream flow mechanisms.

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“…The lack of deformation structures such as a 'gravifossum' (cf. Gruszka and Van Loon, 2011) suggests that accumulation occurred in a crevasse opened up to the substratum. The lack of deformation, e.g., anticlinal folds with flexures and faults within, which are typical of squeezing of unfrozen substratum sediments into the crevasse, suggests that the substratum sediments at the Nowa Kornica were frozen (Boulton et al, 1996;Benn and Evans, 1998;Morawski, 2007).…”

Section: Development Of the Sedimentary Successionmentioning

confidence: 99%

Transverse, supraglacially derived crevasse infillings in a Pleistocene ice-sheet margin zone (eastern Poland): Genesis and sedimentary record

Godlewska

Terpiłowski

2012

Geomorphology

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Genesis of a giant gravity-induced depression (gravifossum) in the Enköping esker, S. Sweden

Cited by 22 publications

References 27 publications

Specific erosional and depositional processes in a pleistocene subglacial tunnel in the wielkopolska region, poland

Specific erosional and depositional processes in a pleistocene subglacial tunnel in the wielkopolska region, poland

Sedimentological and deformational criteria for discriminating subglaciofluvial deposits from subaqueous ice‐contact fan deposits: A Pleistocene example (Ireland)

Transverse, supraglacially derived crevasse infillings in a Pleistocene ice-sheet margin zone (eastern Poland): Genesis and sedimentary record

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