Episodes of Early Pleistocene West Antarctic Ice Sheet Retreat Recorded by Iceberg Alley Sediments

Bailey, Ian; Hemming, Sidney; Reilly, Brendan T.; Rollinson, Gavyn; Williams, Trevor; Weber, Michael E.; Raymo, Maureen E.; Peck, Victoria L.; Ronge, Thomas A.; Brachfeld, Stefanie; O'Connell, Suzanne; Tauxe, Lisa; Warnock, Jonathan P.; Armbrecht, Linda; Cardillo, Fabricio G.; Du, Zhiheng; Fauth, Gerson; Garcia, Marga; Glueder, Anna; Guitard, Michelle; Gutjahr, Marcus; Hernández‐Almeida, Iván; Hoem, Frida S.; Hwang, Ji‐Hwan; Iizuka, Mutsumi; Kato, Yuji; Kenlee, Bridget; Martos, Yasmina M.; Pérez, Lara F.; Seki, Osamu; Tripathi, Shubham; Zheng, Xufeng

doi:10.1029/2022PA004433

Title: Episodes of Early Pleistocene West Antarctic Ice Sheet Retreat Recorded by Iceberg Alley Sediments

Journal Article · Tue Jul 12 00:00:00 EDT 2022 · Paleoceanography and Paleoclimatology

DOI:https://doi.org/10.1029/2022PA004433· OSTI ID:1875985

^[1]; Hemming, Sidney ^[2];

^[3]; Rollinson, Gavyn ^[1]; Williams, Trevor ^[4];

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^[8]; O'Connell, Suzanne ^[9];

^[3];

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^[11]; Cardillo, Fabricio G. ^[12]; Du, Zhiheng ^[13]; Fauth, Gerson ^[14];

^[15]; Glueder, Anna ^[16]; Guitard, Michelle ^[17] more »

Camborne School of Mines University of Exeter Penryn Campus Cornwall UK
Lamont‐Doherty Earth Observatory Columbia University Palisades NY USA
Scripps Institution of Oceanography University of California San Diego La Jolla CA USA
International Ocean Discovery Program Texas AM University College Station TX USA
Department of Geochemistry and Petrology Institute for Geosciences University of Bonn Bonn Germany
British Antarctic Survey Cambridge UK
Alfred‐Wegener‐Institut Helmholtz‐Zentrum für Polar‐und Meeresforschung Bremerhaven Germany
Earth and Environmental Studies Montclair State University Montclair NJ USA
Department of Earth and Environmental Sciences Wesleyan University Middletown CT USA
Department of Geoscience Indiana University of Pennsylvania Indiana PA USA
Institute for Marine and Antarctic Studies University of Tasmania Battery Point TAS Australia
Departmento Oceanografia Servicio de Hidrografia Naval Ministerio de Defensa Buenos Aires Argentina
State Key Laboratory of Cryospheric Science Northwest Institute of Eco‐Environment and Resources Lanzhou China
Geology Program University of Vale do Rio dos Sinos São Leopoldo Brazil
Andalusian Institute of Earth Science (CSIC‐UGR) Granada Spain, Cádiz Oceanographic Centre (IEO‐CSIC) Cádiz Spain
College of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis OR USA
College of Marine Science University of South Florida St. Petersburg FL USA
GEOMAR Helmholtz Centre for Ocean Research University of Kiel Kiel Germany
Department of Earth Sciences ETH Zurich Zurich Switzerland
Department of Earth Science, Marine Palynology and Paleoceanography Utrecht University Utrecht The Netherlands
Earth Environmental Sciences Korea Basic Science Institute Chungbuk Cheongju Republic of Korea
Knowledge Engineering Tokyo City University Tokyo Japan
Faculty of Life and Environmental Sciences University of Tsukuba Tsukuba Japan
Department of Earth Sciences University of California Riverside Riverside CA USA
NASA Goddard Space Flight Center Planetary Magnetospheres Laboratory Greenbelt MD USA, Department of Astronomy University of Maryland College Park MD USA
British Antarctic Survey Cambridge UK, Department of Marine Geology Geological Survey of Denmark and Greenland Aarhus University City Aarhus Denmark
Institute of Low Temperature Science Hokkaido University Sapporo Japan
Marine Stable Isotope Lab National Centre for Polar and Ocean Research Ministry of Earth Sciences Vasco Da Gama India
South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou China

Abstract Ice loss in the Southern Hemisphere has been greatest over the past 30 years in West Antarctica. The high sensitivity of this region to climate change has motivated geologists to examine marine sedimentary records for evidence of past episodes of West Antarctic Ice Sheet (WAIS) instability. Sediments accumulating in the Scotia Sea are useful to examine for this purpose because they receive iceberg‐rafted debris (IBRD) sourced from the Pacific‐ and Atlantic‐facing sectors of West Antarctica. Here we report on the sedimentology and provenance of the oldest of three cm‐scale coarse‐grained layers recovered from this sea at International Ocean Discovery Program Site U1538. These layers are preserved in opal‐rich sediments deposited ∼1.2 Ma during a relatively warm regional climate. Our microCT‐based analysis of the layer's in‐situ fabric confirms its ice‐rafted origin. We further infer that it is the product of an intense but short‐lived episode of IBRD deposition. Based on the petrography of its sand fraction and the Phanerozoic ⁴⁰ Ar/ ³⁹ Ar ages of hornblende and mica it contains, we conclude that the IBRD it contains was likely sourced from the Weddell Sea and/or Amundsen Sea embayment(s) of West Antarctica. We attribute the high concentrations of IBRD in these layers to “dirty” icebergs calved from the WAIS following its retreat inland from its modern grounding line. These layers also sit at the top of a ∼366‐m thick Pliocene and early Pleistocene sequence that is much more dropstone‐rich than its overlying sediments. We speculate this fact may reflect that WAIS mass‐balance was highly dynamic during the ∼41‐kyr (inter)glacial world.

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Sponsoring Organization:: USDOE

OSTI ID:: 1875985

Alternate ID(s):: OSTI ID: 1875986

Journal Information:: Paleoceanography and Paleoclimatology, Journal Name: Paleoceanography and Paleoclimatology Vol. 37 Journal Issue: 7; ISSN 2572-4517

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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