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Stratified glacimarine basin-fills in West Greenland fjords

C. Ó Cofaigh, K. A. Hogan, J. A. Dowdeswell and K. Streuff
Geological Society, London, Memoirs, 46, 99-100, 2016, https://doi.org/10.1144/M46.83
C. Ó Cofaigh
Department of Geography, Durham University, Durham DH1 3LE, UK
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K. A. Hogan
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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J. A. Dowdeswell
Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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K. Streuff
Department of Geography, Durham University, Durham DH1 3LE, UK
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Acoustically stratified sediments that infill glacially eroded bedrock basins are common in fjords (Seramur et al. 1997; Gilbert et al. 1998; Hogan et al. 2012; Dowdeswell & Vasquez 2013). Internally, such stratified sediments are often characterized by relatively smooth reflections that parallel the seafloor. Sills between basins usually comprise bedrock, sometimes covered by a thin veneer of glacimarine sediment and/or till. Fjords in West Greenland, including Rink Fjord and Vaigat, contain bedrock basins infilled by acoustically stratified sediment (Fig. 1). The basin fills are a product of rain-out from turbid meltwater plumes, probably supplemented by iceberg-rafting and downslope resedimentation.

Fig. 1.

Multibeam bathymetry and acoustic sub-bottom profiles of submarine basins close to the coast of West Greenland. (a) Multibeam bathymetry from Rink Fjord, West Greenland, with water depths >1000 m. (b) 3.5 kHz sub-bottom profile from Rink Fjord showing stratified, conformable basin fill (Facies 2) between basement pinnacles (Facies 1). VE×96. (c, d) Multibeam bathymetry in Vaigat strait and a coastal basin, West Greenland, respectively; arrows indicate ice-flow directions during the last glacial based on the orientation of sculpted …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Stratified glacimarine basin-fills in West Greenland fjords

C. Ó Cofaigh, K. A. Hogan, J. A. Dowdeswell and K. Streuff
Geological Society, London, Memoirs, 46, 99-100, 2016, https://doi.org/10.1144/M46.83
C. Ó Cofaigh
Department of Geography, Durham University, Durham DH1 3LE, UK
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  • For correspondence: colm.ocofaigh@durham.ac.uk
K. A. Hogan
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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J. A. Dowdeswell
Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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K. Streuff
Department of Geography, Durham University, Durham DH1 3LE, UK
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Stratified glacimarine basin-fills in West Greenland fjords

C. Ó Cofaigh, K. A. Hogan, J. A. Dowdeswell and K. Streuff
Geological Society, London, Memoirs, 46, 99-100, 30 November 2016, https://doi.org/10.1144/M46.83
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