Late Holocene cyclic glaciomarine sedimentation in a subpolar fjord of the South Shetland Islands, Antarctica, and its paleoceanographic significance: Sedimentological, geochemical, and paleontological evidence

Yoon, Ho Il; Yoo, Kyu‐Cheul; Bak, Young-Suk; Lim, Hyoun Soo; Kim, Yeadong; Lee, Jae Il

doi:10.1130/b30178.1

Cited by 15 publications

(23 citation statements)

References 51 publications

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“…This interpretation is in agreement with the relatively high C org /N tot ratios of this unit, which may result from nitrogen limitation in response to ice cover (e.g. McMinn et al, 2001;Yoon et al, 2010). In cores GC358, GC359, GC360, GC362, GC370, GC371, GC372 and PS2533-2 the increasing influence of seasonal open-water conditions towards the top of the gravelly sandy mud is reflected by an increase of C org and/or CaCO 3 concentrations, the onset of bioturbation and/or the increase of silt and clay contents ( Fig.…”

Section: Distal Sub-ice Shelf/sub-sea Ice Faciessupporting

confidence: 88%

“…C org /N tot ratios up to 30 have been reported from Holocene Antarctic shelf sediments and were attributed to enhanced supply of terrestrial organic material or (lipid-rich) organic matter from marine benthic algae in combination with limited nitrogen availability under sea-ice cover (e.g. Yoon et al, 2000Yoon et al, , 2010McMinn et al, 2001;Presti et al, 2003). Inorganic nitrogen is likely to contribute to the low C org /N tot ratios in the gravelly diamictons at sites GC362, GC365 and GC366, because these sediments are characterised by the highest illite contents in the study area (Fig.…”

Section: Contents Of Inorganic and Organic Carbon And C Org /N Tot Ramentioning

confidence: 98%

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The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Hillenbrand

Larter

Dowdeswell

et al. 2010

Quaternary Science Reviews

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a b s t r a c tA major trough ("Belgica Trough") eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan ("Belgica TMF") on the adjacent continental slope. Previous marine geophysical and geological studies investigated the bathymetry and geomorphology of Belgica Trough and Belgica TMF, erosional and depositional processes associated with bedform formation, and the temporal and spatial changes in clay mineral provenance of subglacial and glaciomarine sediments.Here, we present multi-proxy data from sediment cores recovered from the shelf and uppermost slope in the southern Bellingshausen Sea and reconstruct the ice-sheet history since the last glacial maximum (LGM) in this poorly studied area of West Antarctica. We combined new data (physical properties, sedimentary structures, geochemical and grain-size data) with published data (shear strength, clay mineral assemblages) to refine a previous facies classification for the sediments. The multi-proxy approach allowed us to distinguish four main facies types and to assign them to the following depositional settings: 1) subglacial, 2) proximal grounding-line, 3) distal sub-ice shelf/sub-sea ice, and 4) seasonal open-marine. In the seasonal open-marine facies we found evidence for episodic currentinduced winnowing of near-seabed sediments on the middle to outer shelf and at the uppermost slope during the late Holocene.In addition, we obtained data on excess 210 Pb activity at three core sites and 44 AMS 14 C dates from the acid-insoluble fraction of organic matter (AIO) and calcareous (micro-) fossils, respectively, at 12 sites. These chronological data enabled us to reconstruct, for the first time, the timing of the last advance and retreat of the West Antarctic Ice Sheet (WAIS) and the Antarctic Peninsula Ice Sheet (APIS) in the southern Bellingshausen Sea. We used the down-core variability in sediment provenance inferred from clay mineral changes to identify the most reliable AIO 14 C ages for ice-sheet retreat. The palaeo-ice stream advanced through Belgica Trough after w36.0 corrected 14 C ka before present (B.P.). It retreated from the outer shelf at w25.5 ka B.P., the middle shelf at w19.8 ka B.P., the inner shelf in Eltanin Bay at w12.3 ka B.P., and the inner shelf in Ronne Entrance at w6.3 ka B.P. The retreat of the WAIS and APIS occurred slowly and stepwise, and may still be in progress. This dynamical ice-sheet behaviour has to be taken into account for the interpretation of recent and the prediction of future mass-balance changes in the study area. The glacial history of the southern Bellingshausen Sea is unique when compared to other regions in West Antarctica, but some open questions regarding its chronology need to be addressed by future work.

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Section: Distal Sub-ice Shelf/sub-sea Ice Faciessupporting

confidence: 88%

Section: Contents Of Inorganic and Organic Carbon And C Org /N Tot Ramentioning

confidence: 98%

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Hillenbrand

Larter

Dowdeswell

et al. 2010

Quaternary Science Reviews

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“…At JTC/JPC-17, the picture may be obstructed by other environmental factors related with high Globocassidulina biora FA, which are discussed in later sections. Yoon et al (2010) reported the presence of repeated couplets of organic-rich massive diamictons and organic-poor stratified diamictons of~550 yr cyclic frequency at two sites (CB1 and CB2) from Collins Harbor (Fig. 1c) in proximity of our JTC/JPC-17 site, where some of the Neogloboquadrina pachyderma highs are also recorded.…”

Section: Fluctuating Open-marine Conditions Interpreted From the Jpc-mentioning

confidence: 89%

“…Investigations focused on marine records from Bransfield Strait (Bárcena et al, 1998(Bárcena et al, , 2006Fabrés et al, 2000;Khim et al, 2002;Heroy et al, 2008) to understand paleoceanographic patterns in the area and their relation to climate Marine Geology 326-328 (2012) [67][68][69][70][71][72][73][74][75][76][77][78][79] change. Simultaneously, Maxwell Bay (MB) has emerged as the key location for studying fjord archives, which are under mixed influence from the open ocean and surrounding islands (Yoon et al, 1997(Yoon et al, , 2004(Yoon et al, , 2010Li et al, 2000;Milliken et al, 2009;Hass et al, 2010;Monien et al, 2011;Simms et al, 2011). Further studies targeted terrestrial (Birkenmajer, 1979;Rachlewicz, 1999;Emslie et al, 2003;Sun et al, 2005;Hall, 2007Hall, , 2010Watcham et al, 2011) and lake archives (Mäusbacher et al, 1989;Björk et al, 1996;Martinez-Macchiavello et al, 1996;Tatur et al, 1999;Yoon et al, 2006) from King George Island.…”

Section: Introductionmentioning

confidence: 94%

“…Further studies targeted terrestrial (Birkenmajer, 1979;Rachlewicz, 1999;Emslie et al, 2003;Sun et al, 2005;Hall, 2007Hall, , 2010Watcham et al, 2011) and lake archives (Mäusbacher et al, 1989;Björk et al, 1996;Martinez-Macchiavello et al, 1996;Tatur et al, 1999;Yoon et al, 2006) from King George Island. Even though the newest paleoenvironmental reconstructions for MB provide new insight (Milliken et al, 2009;Hass et al, 2010;Yoon et al, 2010;Monien et al, 2011), better understanding of spatial variability within MB is needed to fully comprehend local and regional influences on climate change during the Holocene.…”

Section: Introductionmentioning

confidence: 99%

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Holocene oceanographic and glacial changes recorded in Maxwell Bay, West Antarctica

et al. 2012

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Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile

Boldt

Nittrouer

Hallet

et al. 2013

J. Geophys. Res. Earth Surf.

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[1] Rates of glacial erosion in temperate climates rank among the highest worldwide, and the sedimentary products of such erosion record climatic and tectonic signals in many glaciated settings, as well as temporal changes in glacier behavior. Glacial sediment yields are expected to decrease with increasing latitude because decreased temperature and meltwater production reduce glacial sliding, erosion, and sediment transfer; however, this expectation lacks a solid supportive database. Herein we present modern 210 Pb-derived sediment accumulation rates on decadal to century time scales for 12 fjords spanning 15°of latitude from the Antarctic Peninsula to southern Chile and interpret the results in light of glacimarine sediment accumulation worldwide. 210 Pb records from the Antarctic Peninsula show surprisingly steady sediment accumulation throughout the past century at rates of 1-7 mm yr À1 , despite rapid warming and glacial retreat. Cores from the South Shetland Islands reveal accelerated sediment accumulation over the past few decades, likely due to changes in the thermal state of the glaciers in this region, which straddles the boundary between subpolar and temperate conditions. In Patagonia and Tierra del Fuego, sediment accumulates faster (11-24 mm yr À1 ), and previously collected seismic profiles show that rates reach meters per year close to the glacier termini. This increase in sediment accumulation rates with decreasing latitude reflects the gradient from subpolar to temperate climates and is consistent with glacial erosion being much faster in the temperate climate of southern Chile than in the polar climate of the Antarctic Peninsula.

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Late Holocene cyclic glaciomarine sedimentation in a subpolar fjord of the South Shetland Islands, Antarctica, and its paleoceanographic significance: Sedimentological, geochemical, and paleontological evidence

Cited by 15 publications

References 51 publications

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Holocene oceanographic and glacial changes recorded in Maxwell Bay, West Antarctica

Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile

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