Correlation of Early Pliocene diatomite to low amplitude Milankovitch cycles in the ANDRILL AND-1B drill core |
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| Institution: | 1. Stiftung Alfred-Wegener-Institut für Polar- und Meeresforschung in der Helmholtz-Gemeinschaft, Am Alten Hafen 26, D-27568 Bremerhaven, Germany;2. Northern Illinois University, Department of Geology and Environmental Geosciences, Davis Hall 312, Normal Rd., DeKalb, IL 60115, USA;1. Climate Change Institute, University of Maine, USA;2. Department of Earth and Atmospheric Sciences, Metropolitan State University of Denver, USA;3. Department of Geography, and the Polar Center, Pennsylvania State University, USA;1. Key Laboratory for Virtual Geographic Environment of Ministry of Education/State Key Laboratory of Geographical Evolution of Jiangsu Provincial Cultivation Base/School of Geography Science, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, Jiangsu, 210023, China;2. Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems/School of Mathematical Science, Nanjing Normal University, Nanjing, Jiangsu, 210023, China;3. Open Studio for the Simulation of Ocean-Climate-Isotope, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong, 266237, China;1. Departamento de Oceanografía, Instituto Antártico Argentino, Av. 25 de Mayo 1143 (B1650HMK), General San Martín, Buenos Aires, Argentina;2. Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Intendente Güiraldes 2160 (C1428EGA), Ciudad de Autónoma de Buenos Aires, Argentina;3. Servicio de Hidrografía Naval and UMI-IFAECI, Av. Montes de Oca 2124 (C1270ABV), Ciudad Autónoma de Buenos Aires, Argentina;4. Laboratório de Estudos dos Oceanos e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, 96203-900, Brasil;1. Department of Geology, Colby College, Waterville, ME, 04901, USA;2. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA;3. Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, 10964, USA;4. School of Earth and Climate Sciences and the Climate Change Institute, University of Maine, Orono, ME, 04469, USA;5. Laboratoire D’Océanologie et Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte D’Opale, UMR 8187, LOG, Lille, F 59000, France |
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| Abstract: | In the austral summer of 2006/7 the ANDRILL MIS (ANtarctic geological DRILLing-McMurdo Ice Shelf) project recovered a 1285 m sediment core from beneath the Ross Ice Shelf near Ross Island, Antarctica in a flexural moat associated with volcanic loading. The upper ~ 600 m of this core contain sediments recording 38 glacial/interglacial cycles of Early Pliocene to Pleistocene time, including 13 discrete diatomite units (DUs). The longest of these, DU XI, is ~ 76 m-thick, and has been assigned an Early to Mid-Pliocene age (5–3 Ma). A detailed record of the siliceous microfossil assemblages in DU XI is used in conjunction with geochemical and sedimentological data to subdivide DU XI into four discrete subunits of continuous sedimentation. Within each subunit, changes in diatom assemblages have been correlated with the δ18O record, providing a temporal resolution up to 600 yr, and allowing for the construction of a detailed age model and calculation of associated sediment accumulation rates within DU XI. Results indicate a productivity-dominated sedimentary record with greater proportions of hemipelagic mud accumulating during relatively cool periods. This implies that even during periods of substantial warmth, Milankovitch-paced changes in Antarctic ice volume can be linked to ecological changes recorded in diatom assemblages. |
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