The LGM and post-LGM history of the Antarctic Ice Sheet (AIS) can be reconstructed by studying cores and box cores collected along the continental slope of Antarctica. According to several authors (Shipp et al., 1999; Mosola & Anderson, 2006; Halberstadt et al., 2016; Anderson et al., 2018; Gales et al., 2021) the Western Antarctic Ice Sheet (WAIS) was grounded near the shelf break in many sectors of the Eastern Ross Sea (ERS) during the Last Glacial Maximum (LGM). However, the post-LGM retreat is characterized by lacks and uncertainties. Three box cores were collected east of the Hillary Canyon, which carves the ERS continental slope south-east to the Iselin Bank, during the XXIX PNRA (Italian National Antarctic Research Program) expedition (2013-2014). The samples were studied in the frame of the ROSSLOPE II (2013/AN2.01) PNRA project and then in the frame of the STREAM Project (Late Quaternary evolution of the ocean-ice sheet interactions: the record from the Ross Sea continental margin, Antarctica (project funded by the Italian Ministry of Foreign Affairs and International Cooperation and the National Research Foundation of Korea). Grain size, organic matter, biogenic silica and water content, magnetic susceptibility and chemical composition (XRF core scanner) were analyzed in order to reconstruct the paleoclimate of Late Quaternary. Organic matter (14C AIO dates) was used to date each box core. The results of these analyses are presented here. References Anderson J.B., Simkins L.M., Bart P.J., De Santis L., Halberstadt A.R.W., Olivo E. & Greenwood S.L. 2018. Seismic and geomorphic records of Antarctic Ice Sheet evolution in the Ross Sea and controlling factors in its behaviour. In: Le Heron, D.P., Hogan, K.A., Phillips, E.R., Huuse, M., Busfield, M.E. & Graham, A.G.C. Eds., Glaciated Margins: The Sedimentary and Geophysical Archive. Geological Society, London, Special Publications, 475, 223-240. Gales J., Rebesco M., De Santis L., Bergamasco A., Colleoni F., Kim S., Accettella D., Kovacevic V., Liu Y., Olivo E., Colizza E., Florindo-Lopez C., Zgur F. & McKay R. 2021. Role of dense shelf water in the development of Antarctic submarine canyon morphology. Geomorphology, 372, 107453. Halberstadt A.R.W., Simkins L.M., Greenwood S.L. & Anderson J.B. 2016. Past ice-sheet behaviour: retreat scenarios and changing controls in the Ross Sea, Antarctica. The Cryosphere, 10, 1003-1020. Mosola A.B. & Anderson J.B. 2006. Expansion and rapid retreat of the West Antarctic Ice Sheet in Eastern Ross Sea: possible consequence of over-extended ice stream. Quat. Sci. Rev., 29, 2177-2196. Shipp S., Anderson J.B. & Domack E.W. 1999. Late Pleistocene/Holocene retreat of the West Antarctic ice-sheet system in the Ross Sea. Part 1. Geophysical results. GSA Bulletin, 111, 1486–1516.
Multidisciplinary analysis of three box cores collected east to the Hillary Canyon (Eastern Ross Sea, Antarctica)
Geniram A.
;Colizza E.;De Santis L.;Torricella F.
2021-01-01
Abstract
The LGM and post-LGM history of the Antarctic Ice Sheet (AIS) can be reconstructed by studying cores and box cores collected along the continental slope of Antarctica. According to several authors (Shipp et al., 1999; Mosola & Anderson, 2006; Halberstadt et al., 2016; Anderson et al., 2018; Gales et al., 2021) the Western Antarctic Ice Sheet (WAIS) was grounded near the shelf break in many sectors of the Eastern Ross Sea (ERS) during the Last Glacial Maximum (LGM). However, the post-LGM retreat is characterized by lacks and uncertainties. Three box cores were collected east of the Hillary Canyon, which carves the ERS continental slope south-east to the Iselin Bank, during the XXIX PNRA (Italian National Antarctic Research Program) expedition (2013-2014). The samples were studied in the frame of the ROSSLOPE II (2013/AN2.01) PNRA project and then in the frame of the STREAM Project (Late Quaternary evolution of the ocean-ice sheet interactions: the record from the Ross Sea continental margin, Antarctica (project funded by the Italian Ministry of Foreign Affairs and International Cooperation and the National Research Foundation of Korea). Grain size, organic matter, biogenic silica and water content, magnetic susceptibility and chemical composition (XRF core scanner) were analyzed in order to reconstruct the paleoclimate of Late Quaternary. Organic matter (14C AIO dates) was used to date each box core. The results of these analyses are presented here. References Anderson J.B., Simkins L.M., Bart P.J., De Santis L., Halberstadt A.R.W., Olivo E. & Greenwood S.L. 2018. Seismic and geomorphic records of Antarctic Ice Sheet evolution in the Ross Sea and controlling factors in its behaviour. In: Le Heron, D.P., Hogan, K.A., Phillips, E.R., Huuse, M., Busfield, M.E. & Graham, A.G.C. Eds., Glaciated Margins: The Sedimentary and Geophysical Archive. Geological Society, London, Special Publications, 475, 223-240. Gales J., Rebesco M., De Santis L., Bergamasco A., Colleoni F., Kim S., Accettella D., Kovacevic V., Liu Y., Olivo E., Colizza E., Florindo-Lopez C., Zgur F. & McKay R. 2021. Role of dense shelf water in the development of Antarctic submarine canyon morphology. Geomorphology, 372, 107453. Halberstadt A.R.W., Simkins L.M., Greenwood S.L. & Anderson J.B. 2016. Past ice-sheet behaviour: retreat scenarios and changing controls in the Ross Sea, Antarctica. The Cryosphere, 10, 1003-1020. Mosola A.B. & Anderson J.B. 2006. Expansion and rapid retreat of the West Antarctic Ice Sheet in Eastern Ross Sea: possible consequence of over-extended ice stream. Quat. Sci. Rev., 29, 2177-2196. Shipp S., Anderson J.B. & Domack E.W. 1999. Late Pleistocene/Holocene retreat of the West Antarctic ice-sheet system in the Ross Sea. Part 1. Geophysical results. GSA Bulletin, 111, 1486–1516.Pubblicazioni consigliate
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