Till genesis at the bed of an Antarctic Peninsula palaeo-ice stream as indicated by micromorphological analysis

Reinardy, Benedict; Hiemstra, John F.; Murray, Tavi; Hillenbrand, Claus‐Dieter; Larter, Robert D

doi:10.1111/j.1502-3885.2010.00199.x

Cited by 41 publications

(32 citation statements)

References 87 publications

(106 reference statements)

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“…Also crucial is the association of microstructures -in glacimarine deposits these tend to be isolated and unrelated to each other (Carr, 2001;Carr et al, 2006). In contrast, microstructures caused by glacial deformation tend to form in zones or in close association with each other (Reinardy et al, 2011a;Phillips et al, 2011). Thus, evidence from both fabric analyses and microstructures can be effectively combined to interpret differences in glacimarine and subglacial sediments.…”

Section: Micromorphological Analysis and Fabric Datamentioning

confidence: 93%

“…In contrast, facies 1a tends to be more matrix-rich. Importantly, both facies have a preferred fabric orientation that is either unimodal or bimodal (referred to as S1 and S2 fabrics) which is common in polydeformational tills formed within a deforming continuum and increasing stress regime but would not be expected in sediment deposited in open marine conditions or via mass movement (Carr et al, 2006;Phillips, 2006Phillips, , 2011Reinardy et al, 2011a). S1 fabric (orientated between 130°and 160°) is formed before S2 fabric (orientated between 35°and 50°) so S1 fabric is not always preserved or has limited preservation.…”

Section: Facies 1a and 1bmentioning

confidence: 98%

“…Micromorphology has previously been used to provide evidence of grounded ice at Cape Roberts (van der Meer and Hiemstra, 1998;Hiemstra, 1999;van der Meer, 2000). The technique has also been used on Antarctic sediments to indicate basal thermal regime (Baroni and Fasano, 2006), deformation processes Ó Cofaigh et al, 2005;Reinardy et al, 2011a) and to characterise glacimarine sediments (Kilfeather et al, 2010) and iceberg turbates (Linch, 2010).…”

Section: Micromorphological Analysis and Fabric Datamentioning

confidence: 99%

See 2 more Smart Citations

Repeated advance and retreat of the East Antarctic Ice Sheet on the continental shelf during the early Pliocene warm period

Reinardy

Escutia

Iwai

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Micromorphological Analysis and Fabric Datamentioning

confidence: 93%

Section: Facies 1a and 1bmentioning

confidence: 98%

Section: Micromorphological Analysis and Fabric Datamentioning

confidence: 99%

See 1 more Smart Citation

Repeated advance and retreat of the East Antarctic Ice Sheet on the continental shelf during the early Pliocene warm period

Reinardy

Escutia

Iwai

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…One mechanism to explain their absence is that water could be transported through the sediment, i.e., by Darcian flow within the subglacial till, which has a higher permeability than the acoustic basement (Kamb, 2001). Although low till permeability might not be sufficient to transport large amounts of water quickly, microscopic studies on tills from Antarctic paleo-ice stream troughs have revealed ductile deformation structures in soft till overlying dewatered stiff till (Reinardy et al, 2011). This observation suggests significant basal meltwater transfer within the subglacial sediment bed.…”

Section: Meltwater Flowmentioning

confidence: 99%

Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica

et al. 2013

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Abstract.Increasing evidence for an elaborate subglacial drainage network underneath modern Antarctic ice sheets suggests that basal meltwater has an important influence on ice stream flow. Swath bathymetry surveys from previously glaciated continental margins display morphological features indicative of subglacial meltwater flow in inner shelf areas of some paleo ice stream troughs. Over the last few years several expeditions to the eastern Amundsen Sea embayment (West Antarctica) have investigated the paleo ice streams that extended from the Pine Island and Thwaites glaciers. A compilation of high-resolution swath bathymetry data from inner Pine Island Bay reveals details of a rough seabed topography including several deep channels that connect a series of basins. This complex basin and channel network is indicative of meltwater flow beneath the paleo-Pine Island and Thwaites ice streams, along with substantial subglacial water inflow from the east. This meltwater could have enhanced ice flow over the rough bedrock topography. Meltwater features diminish with the onset of linear features north of the basins. Similar features have previously been observed in several other areas, including the Dotson-Getz Trough (western Amundsen Sea embayment) and Marguerite Bay (SW Antarctic Peninsula), suggesting that these features may be widespread around the Antarctic margin and that subglacial meltwater drainage played a major role in past ice-sheet dynamics.

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“…In contrast, palaeo-ice-stream beds offer ease of access from ships and the possibility to collect data across the whole of the ice-stream bed using marine geophysical techniques. Shallow acoustic stratigraphy and sediment facies in cores have been used to investigate the nature of subglacial tills beneath former ice streams and to infer the nature of the processes operating at the ice-bed interface [54,[67][68][69]. These investigations have shown that Antarctic ice streams are often associated with the presence of a thick, soft and porous subglacial till layer that is a product of a combination of subglacial sediment deformation and lodgement [70].…”

Section: (B) Reconstruction Of Past Ice Sheets On High-and Mid-latitumentioning

confidence: 99%

Ice sheets viewed from the ocean: the contribution of marine science to understanding modern and past ice sheets

Cofaigh

2012

Phil. Trans. R. Soc. A.

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Over the last two decades, marine science, aided by technological advances in sediment coring, geophysical imaging and remotely operated submersibles, has played a major role in the investigation of contemporary and former ice sheets. Notable advances have been achieved with respect to reconstructing the extent and flow dynamics of the large polar ice sheets and their mid-latitude counterparts during the Quaternary from marine geophysical and geological records of landforms and sediments on glacierinfluenced continental margins. Investigations of the deep-sea ice-rafted debris record have demonstrated that catastrophic collapse of large (10 5 -10 6 km 2 ) ice-sheet drainage basins occurred on millennial and shorter time scales and had a major influence on oceanography. In the last few years, increasing emphasis has been placed on understanding physical processes at the ice-ocean interface, particularly at the grounding line, and on determining how these processes affect ice-sheet stability. This remains a major challenge, however, owing to the logistical constraints imposed by working in ice-infested polar waters and ice-shelf cavities. Furthermore, despite advances in reconstructing the Quaternary history of mid-and high-latitude ice sheets, major unanswered questions remain regarding West Antarctic ice-sheet stability, and the longterm offshore history of the East Antarctic and Greenland ice sheets remains poorly constrained. While these are major research frontiers in glaciology, and ones in which marine science has a pivotal role to play, realizing such future advances will require an integrated collaborative approach between oceanographers, glaciologists, marine geologists and numerical modellers.

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Till genesis at the bed of an Antarctic Peninsula palaeo-ice stream as indicated by micromorphological analysis

Cited by 41 publications

References 87 publications

Repeated advance and retreat of the East Antarctic Ice Sheet on the continental shelf during the early Pliocene warm period

Repeated advance and retreat of the East Antarctic Ice Sheet on the continental shelf during the early Pliocene warm period

Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica

Ice sheets viewed from the ocean: the contribution of marine science to understanding modern and past ice sheets

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