New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene

Type Article
Date 2021-02
Language English
Author(s) Reilly Brendan T.ORCID1, Tauxe LisaORCID1, Brachfeld Stefanie2, Raymo MaureenORCID3, Bailey IanORCID4, Hemming Sidney3, Weber Michael E.5, Williams Trevor6, Garcia MargaORCID7, Guitard Michelle8, Martos Yasmina M.ORCID9, 10, Pérez Lara F.ORCID11, Zheng XufengORCID12, Armbrecht Linda13, Cardillo Fabricio G.14, Du Zhiheng15, Fauth Gerson16, Glueder Anna17, Gutjahr MarcusORCID18, Hernández‐almeida IvánORCID19, Hoem Frida S.ORCID20, Hwang Ji‐hwan21, Iizuka Mutsumi22, Kato Yuji23, Kenlee BridgetORCID24, O’connell SuzanneORCID25, Peck Victoria11, Ronge Thomas A.ORCID26, Seki OsamuORCID27, Tripathi ShubhamORCID28, Warnock Jonathan29
Affiliation(s) 1 : Scripps Institution of Oceanography University of California San Diego La Jolla CA92093, USA
2 : Earth and Environmental Studies Montclair State University Montclair NJ07043, USA
3 : Lamont‐Doherty Earth Observatory Columbia University Palisades NY10964, USA
4 : Camborne School of Mines and Environmental Sustainability Institute University of Exeter Penryn Campus CornwallTR10 9FE ,UK
5 : Institute for Geosciences University of Bonn Bonn53115, Germany
6 : International Ocean Discovery Program Texas AM University College Station TX77845 ,USA
7 : Oceanographic Center of Cadiz Spanish Institute of Oceanography (IEO) Puerto Pesquero, Muelle de Levante, S/NCádiz, 11006 ,Spain
8 : College of Marine Science University of South Florida St. Petersburg FL33701, USA
9 : Planetary Magnetospheres Laboratory NASA Goddard Space Flight Center Greenbelt MD20771, USA
10 : Department of Astronomy University of Maryland College Park College Park MD20742 ,USA
11 : British Antarctic Survey CambridgeCB3 0ET,UK
12 : South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou510301, China
13 : Australian Centre for Ancient DNA Department of Ecology & Evolutionary Biology University of Adelaide South Australia5005, Australia
14 : Departmento Oceanografia Servicio de Hidrografia Naval Ministerio de Defensa, Argentina
15 : State Key Laboratory of Cryospheric Science Northwest Institute of Eco‐Environment and Resources Chinese Academy of Sciences Lanzhou730000 ,China
16 : Geology Program University of Vale do Rio dos Sinos São Leopoldo RS, 93022‐750, Brazil
17 : College of Earth Ocean, and Atmospheric Sciences Oregon State University Corvallis OR97331, USA
18 : GEOMAR Helmholtz Centre for Ocean Research Kiel 24148 Kiel, Germany
19 : Department of Earth Sciences ETH Zürich 8092 Zurich, Switzerland
20 : Department of Earth Sciences Marine Palynology and Paleoceanography Utrecht University 3584CB Utrecht ,Netherlands
21 : Earth Environmental Sciences Korea Basic Science Institute Chungbuk Cheongju ,Republic of Korea
22 : Knowledge Engineering Tokyo City University Tokyo setagaya‐ku158‐0087 ,Japan
23 : Center for Advanced Marine Core Research Kochi University MonobeNankoku Kochi783‐8502, Japan
24 : Department of Earth Sciences University of California Riverside Riverside CA92521, USA
25 : Department of Earth and Environmental Sciences Wesleyan University Middletown CT06459 ,USA
26 : Alfred Wegener Institute Helmholtz Center for Polar and Marine Research 27568 Bremerhaven ,Germany
27 : Institute of Low Temperature Science Hokkaido University Sapporo Hokkaido060‐0819, Japan
28 : Marine Stable Isotope Lab National Centre for Polar and Ocean Research Ministry of Earth Sciences Vasco Da Gama403804, India
29 : Department of Geoscience Indiana University of Pennsylvania Indiana PA15705 ,USA
Source Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-02 , Vol. 36 , N. 2 , P. e2020PA003994 (27p.)
DOI 10.1029/2020PA003994
Keyword(s) Antarctica, Dove Basin, Iceberg Alley, International Ocean Discovery Program (IODP), magnetostratigraphy, Scotia Sea
Abstract

International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well‐resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ18O records. This suggests that variations in Dove Basin lithostratigraphy during the Pleistocene reflect a similar history as globally integrated ice volume at these frequencies. However, power in the precession frequencies over the entire ∼3.3 Myr record does not match the amplitude modulation of benthic δ18O records, suggesting Dove Basin contains a unique record at these frequencies. Comparing the position of magnetic reversals relative to local facies changes in Dove Basin and the same magnetic reversals relative to benthic δ18O at North Atlantic IODP Site U1308, we demonstrate Dove Basin facies change at different times than benthic δ18O during intervals between ∼3 and 1 Ma. These differences are consistent with precession phase shifts and suggest climate signals with a Southern Hemisphere summer insolation phase were recorded around Antarctica. If Dove Basin lithology reflects local Antarctic ice volume changes, these signals could represent ice sheet precession‐paced variations not captured in benthic δ18O during the 41‐kyr world.

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Reilly Brendan T., Tauxe Lisa, Brachfeld Stefanie, Raymo Maureen, Bailey Ian, Hemming Sidney, Weber Michael E., Williams Trevor, Garcia Marga, Guitard Michelle, Martos Yasmina M., Pérez Lara F., Zheng Xufeng, Armbrecht Linda, Cardillo Fabricio G., Du Zhiheng, Fauth Gerson, Glueder Anna, Gutjahr Marcus, Hernández‐almeida Iván, Hoem Frida S., Hwang Ji‐hwan, Iizuka Mutsumi, Kato Yuji, Kenlee Bridget, O’connell Suzanne, Peck Victoria, Ronge Thomas A., Seki Osamu, Tripathi Shubham, Warnock Jonathan (2021). New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene. Paleoceanography And Paleoclimatology, 36(2), e2020PA003994 (27p.). Publisher's official version : https://doi.org/10.1029/2020PA003994 , Open Access version : https://archimer.ifremer.fr/doc/00678/79035/