The de Long Trough: A newly discovered glacial trough on the East Siberian continental margin

Matt O'Regan, Jan Backman, Natalia Barrientos, Thomas M. Cronin, Laura Gemery, Nina Kirchner, Larry A. Mayer, Johan Nilsson, Riko Noormets, Christof Pearce, Igor Semiletov, Christian Stranne, Martin Jakobsson

Результат исследований: Материалы для журналаСтатья

5 Цитирования (Scopus)

Выдержка

Ice sheets extending over parts of the East Siberian continental shelf have been proposed for the last glacial period and during the larger Pleistocene glaciations. The sparse data available over this sector of the Arctic Ocean have left the timing, extent and even existence of these ice sheets largely unresolved. Here we present new geophysical mapping and sediment coring data from the East Siberian shelf and slope collected during the 2014 SWERUS-C3 expedition (SWERUS-C3: Swedish-Russian-US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions). The multibeam bathymetry and chirp sub-bottom profiles reveal a set of glacial landforms that include grounding zone formations along the outer continental shelf, seaward of which lies a > 65-m thick sequence of glacio-genic debris flows. The glacial landforms are interpreted to lie at the seaward end of a glacial trough-the first to be reported on the East Siberian margin, here referred to as the De Long Trough because of its location due north of the De Long Islands. Stratigraphy and dating of sediment cores show that a drape of acoustically laminated sediments covering the glacial deposits is older than 50 kyr BP. This provides direct evidence for extensive glacial activity on the Siberian shelf that predates the Last Glacial Maximum and most likely occurred during the Saalian (Marine Isotope Stage (MIS) 6).

Язык оригиналаАнглийский
Страницы (с-по)1269-1284
Число страниц16
ЖурналClimate of the Past
Том13
Номер выпуска9
DOI
СостояниеОпубликовано - 28 сен 2017

Отпечаток

glacial landform
ice sheet
continental margin
continental shelf
trough
Saalian
cryosphere
marine isotope stage
glacial deposit
Last Glacial
Last Glacial Maximum
debris flow
bathymetry
sediment
glaciation
sediment core
stratigraphy
Pleistocene
carbon
climate

ASJC Scopus subject areas

  • Global and Planetary Change
  • Stratigraphy
  • Palaeontology

Цитировать

O'Regan, M., Backman, J., Barrientos, N., Cronin, T. M., Gemery, L., Kirchner, N., ... Jakobsson, M. (2017). The de Long Trough: A newly discovered glacial trough on the East Siberian continental margin. Climate of the Past, 13(9), 1269-1284. https://doi.org/10.5194/cp-13-1269-2017

The de Long Trough : A newly discovered glacial trough on the East Siberian continental margin. / O'Regan, Matt; Backman, Jan; Barrientos, Natalia; Cronin, Thomas M.; Gemery, Laura; Kirchner, Nina; Mayer, Larry A.; Nilsson, Johan; Noormets, Riko; Pearce, Christof; Semiletov, Igor; Stranne, Christian; Jakobsson, Martin.

В: Climate of the Past, Том 13, № 9, 28.09.2017, стр. 1269-1284.

Результат исследований: Материалы для журналаСтатья

O'Regan, M, Backman, J, Barrientos, N, Cronin, TM, Gemery, L, Kirchner, N, Mayer, LA, Nilsson, J, Noormets, R, Pearce, C, Semiletov, I, Stranne, C & Jakobsson, M 2017, 'The de Long Trough: A newly discovered glacial trough on the East Siberian continental margin', Climate of the Past, том. 13, № 9, стр. 1269-1284. https://doi.org/10.5194/cp-13-1269-2017
O'Regan M, Backman J, Barrientos N, Cronin TM, Gemery L, Kirchner N и соавт. The de Long Trough: A newly discovered glacial trough on the East Siberian continental margin. Climate of the Past. 2017 Сент. 28;13(9):1269-1284. https://doi.org/10.5194/cp-13-1269-2017
O'Regan, Matt ; Backman, Jan ; Barrientos, Natalia ; Cronin, Thomas M. ; Gemery, Laura ; Kirchner, Nina ; Mayer, Larry A. ; Nilsson, Johan ; Noormets, Riko ; Pearce, Christof ; Semiletov, Igor ; Stranne, Christian ; Jakobsson, Martin. / The de Long Trough : A newly discovered glacial trough on the East Siberian continental margin. В: Climate of the Past. 2017 ; Том 13, № 9. стр. 1269-1284.
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