Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology

Jenny A Gales, Claus-Dieter Hillenbrand, Rob Larter, Jan Sverre Laberg, Martin Melles, S. Benetti, Sandra Passchier

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

Trough mouth fans (TMFs) are sediment depocentres that form along high-latitude continental margins at the mouths of some cross-shelf troughs. They reflect the dynamics of past ice sheets over multiple glacial cycles and processes operating on (formerly) glaciated continental shelves and slopes, such as erosion, reworking, transport and deposition. The similarities and differences in TMF morphology and formation processes in the Arctic and Antarctic regions remain poorly constrained. We analyse the dimensions and geometries of 15 TMFs from Arctic and Antarctic margins and the grain size distribution of 82 sediment cores centred on them. We compare the grain size composition of sub- and proglacial diamictons deposited on the shelves and glacigenic debris flows deposited on the adjacent TMFs and find a significant difference between Arctic and Antarctic margins. Antarctic margins show a coarser grain size composition for both glacigenic debris flows and shelf diamictons. This significant difference provides insight into high-latitude sediment input, transportation and glacial–interglacial regimes. We suggest that surface runoff and river discharge are responsible for enhanced fine-grained sediment input in the Arctic compared with the Antarctic.
LanguageEnglish
Title of host publicationSP475 Glaciated Margins: The Sedimentary and Geophysical Archive
EditorsD.P. Le Heron, K.A. Hogan, E.R. Phllips, M Huuse, M.E. Busfield, A.G.C. Graham
Volume475
DOIs
Publication statusE-pub ahead of print - 23 Mar 2018

Publication series

NameSpecial Publications
PublisherGeological Society of London
Volume475

Fingerprint

sedimentology
trough
diamicton
grain size
debris flow
depocenter
fine grained sediment
river discharge
reworking
continental slope
interglacial
sediment
sediment core
ice sheet
continental margin
continental shelf
runoff
erosion
geometry

Cite this

Gales, J. A., Hillenbrand, C-D., Larter, R., Laberg, J. S., Melles, M., Benetti, S., & Passchier, S. (2018). Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology. In D. P. Le Heron, K. A. Hogan, E. R. Phllips, M. Huuse, M. E. Busfield, & A. G. C. Graham (Eds.), SP475 Glaciated Margins: The Sedimentary and Geophysical Archive (Vol. 475). (Special Publications; Vol. 475). https://doi.org/10.1144/SP475.7
Gales, Jenny A ; Hillenbrand, Claus-Dieter ; Larter, Rob ; Laberg, Jan Sverre ; Melles, Martin ; Benetti, S. ; Passchier, Sandra. / Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology. SP475 Glaciated Margins: The Sedimentary and Geophysical Archive. editor / D.P. Le Heron ; K.A. Hogan ; E.R. Phllips ; M Huuse ; M.E. Busfield ; A.G.C. Graham. Vol. 475 2018. (Special Publications).
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abstract = "Trough mouth fans (TMFs) are sediment depocentres that form along high-latitude continental margins at the mouths of some cross-shelf troughs. They reflect the dynamics of past ice sheets over multiple glacial cycles and processes operating on (formerly) glaciated continental shelves and slopes, such as erosion, reworking, transport and deposition. The similarities and differences in TMF morphology and formation processes in the Arctic and Antarctic regions remain poorly constrained. We analyse the dimensions and geometries of 15 TMFs from Arctic and Antarctic margins and the grain size distribution of 82 sediment cores centred on them. We compare the grain size composition of sub- and proglacial diamictons deposited on the shelves and glacigenic debris flows deposited on the adjacent TMFs and find a significant difference between Arctic and Antarctic margins. Antarctic margins show a coarser grain size composition for both glacigenic debris flows and shelf diamictons. This significant difference provides insight into high-latitude sediment input, transportation and glacial–interglacial regimes. We suggest that surface runoff and river discharge are responsible for enhanced fine-grained sediment input in the Arctic compared with the Antarctic.",
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Gales, JA, Hillenbrand, C-D, Larter, R, Laberg, JS, Melles, M, Benetti, S & Passchier, S 2018, Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology. in DP Le Heron, KA Hogan, ER Phllips, M Huuse, ME Busfield & AGC Graham (eds), SP475 Glaciated Margins: The Sedimentary and Geophysical Archive. vol. 475, Special Publications, vol. 475. https://doi.org/10.1144/SP475.7

Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology. / Gales, Jenny A; Hillenbrand, Claus-Dieter; Larter, Rob; Laberg, Jan Sverre; Melles, Martin; Benetti, S.; Passchier, Sandra.

SP475 Glaciated Margins: The Sedimentary and Geophysical Archive. ed. / D.P. Le Heron; K.A. Hogan; E.R. Phllips; M Huuse; M.E. Busfield; A.G.C. Graham. Vol. 475 2018. (Special Publications; Vol. 475).

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology

AU - Gales, Jenny A

AU - Hillenbrand, Claus-Dieter

AU - Larter, Rob

AU - Laberg, Jan Sverre

AU - Melles, Martin

AU - Benetti, S.

AU - Passchier, Sandra

PY - 2018/3/23

Y1 - 2018/3/23

N2 - Trough mouth fans (TMFs) are sediment depocentres that form along high-latitude continental margins at the mouths of some cross-shelf troughs. They reflect the dynamics of past ice sheets over multiple glacial cycles and processes operating on (formerly) glaciated continental shelves and slopes, such as erosion, reworking, transport and deposition. The similarities and differences in TMF morphology and formation processes in the Arctic and Antarctic regions remain poorly constrained. We analyse the dimensions and geometries of 15 TMFs from Arctic and Antarctic margins and the grain size distribution of 82 sediment cores centred on them. We compare the grain size composition of sub- and proglacial diamictons deposited on the shelves and glacigenic debris flows deposited on the adjacent TMFs and find a significant difference between Arctic and Antarctic margins. Antarctic margins show a coarser grain size composition for both glacigenic debris flows and shelf diamictons. This significant difference provides insight into high-latitude sediment input, transportation and glacial–interglacial regimes. We suggest that surface runoff and river discharge are responsible for enhanced fine-grained sediment input in the Arctic compared with the Antarctic.

AB - Trough mouth fans (TMFs) are sediment depocentres that form along high-latitude continental margins at the mouths of some cross-shelf troughs. They reflect the dynamics of past ice sheets over multiple glacial cycles and processes operating on (formerly) glaciated continental shelves and slopes, such as erosion, reworking, transport and deposition. The similarities and differences in TMF morphology and formation processes in the Arctic and Antarctic regions remain poorly constrained. We analyse the dimensions and geometries of 15 TMFs from Arctic and Antarctic margins and the grain size distribution of 82 sediment cores centred on them. We compare the grain size composition of sub- and proglacial diamictons deposited on the shelves and glacigenic debris flows deposited on the adjacent TMFs and find a significant difference between Arctic and Antarctic margins. Antarctic margins show a coarser grain size composition for both glacigenic debris flows and shelf diamictons. This significant difference provides insight into high-latitude sediment input, transportation and glacial–interglacial regimes. We suggest that surface runoff and river discharge are responsible for enhanced fine-grained sediment input in the Arctic compared with the Antarctic.

U2 - 10.1144/SP475.7

DO - 10.1144/SP475.7

M3 - Chapter

VL - 475

T3 - Special Publications

BT - SP475 Glaciated Margins: The Sedimentary and Geophysical Archive

A2 - Le Heron, D.P.

A2 - Hogan, K.A.

A2 - Phllips, E.R.

A2 - Huuse, M

A2 - Busfield, M.E.

A2 - Graham, A.G.C.

ER -

Gales JA, Hillenbrand C-D, Larter R, Laberg JS, Melles M, Benetti S et al. Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology. In Le Heron DP, Hogan KA, Phllips ER, Huuse M, Busfield ME, Graham AGC, editors, SP475 Glaciated Margins: The Sedimentary and Geophysical Archive. Vol. 475. 2018. (Special Publications). https://doi.org/10.1144/SP475.7