Provenance analysis of late Pleistocene sediment from IODP site U1477 reveals climate and river basin dynamics in the Zambezi river catchment
中文题名IODPU1477站点的晚更新世沉积物物源分析揭示了赞比西河流域的气候和流域动态
作者Youhong Gao 1;Hucai Zhang 1,2CA1;Xiaonan Zhang 1;Lizeng Duan 1;Huayong Li 3;Ian R. Hall 4;Sidney R. Hemming 5;Leah J. LeVay 6;Junsheng Nie 7;Xibin Han 8;S. Barker 9,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;M.A. Berke 26,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;L. Brentegani 27,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;T. Caley 28,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;A. Cartagena-Sierra 29,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;C.D. Charles 30,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;J.J. Coenen 31,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;J.G. Crespin 28,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;A.M. Franzese 32,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8;J. Gruetzner 33,10,11,12,13,14,15,16,17,18,19,20,21,4,22,23,24,25,8
作者单位1Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan 650500, China;2Southwest United Graduate School, Kunming 650092, China;3School of Resource Environment and Tourism, Anyang Normal University, Anyang 455000, China;4Department of Earth Sciences, Cardiff University, Main College, Park Place, PO Box 914, Cardiff Wales CF10 3AT, United Kingdom;5Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9 W, Palisades NY 10964, USA;6International Ocean Discovery Program, Texas A&M University, College Station TX 77845, USA;7Key Laboratory of Western China’s Environment System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China;8Second Institute of Oceanography (SOA), Key Laboratory of Submarine Science, Hangzhou City, PR China;9School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK;10Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9 W, Palisades, NY 10964, USA;11Chemistry Department, University of Otago, Dunedin, New Zealand;12Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan;13Ice Core Laboratory, National Centre for Antarctic and Ocean Research (NCAOR), Head Land Sada, Vasco da Gama Goa 403804, India;14NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway;15Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China;16International Ocean Discovery Program, Texas A&M University, College Station, TX, USA;17Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, USA;18Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwashi Chiba, Japan;19Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushima-cho 2-15 Yokosuka 237-0061, Japan;20Department of Geosciences, University of Bremen, Bremen, Germany;21Institute of Earth Sciences, Heidelberg University, Heidelberg, Germany;22Graduate School of Oceanography, University of Rhode Island, Narragansett, USA;23Geologisches Institut, Universität Köln, Germany;24Department of Earth Sciences, Cluster Geochemistry & Geology, Vrije Universiteit VU, Amsterdam, the Netherlands;25Programa de Geociências (Geoquímica), Universidade Federal Fluminense, Niterói, Brazil;26Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, USA;27Earth and Environmental Sciences, University of Technology Queensland, Brisbane, Australia;28EPOC, UMR CNRS 5805, University of Bordeaux, Pessac, France;29Department of Earth and Environmental Sciences, Lamont-Doherty, Earth Observatory of Columbia University, Palisades, NY, USA;30Scripps Institution of Oceanography, University of California, San Diego, La Jolla, USA;31Department of Geology, Northern Illinois University, DeKalb, IL 60115, USA;32Natural Sciences Dpartment, School of Earth and Environmental Sciences, Hostos Community College (C.U.N.Y.), Bronx, NY, USA;33Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Alten Hafen 26, D- 27568 Bremerhaven, Germany
刊名Gondwana Research
年2025
卷146
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The provenance of sedimentary material deposited in marginal marine environments offers significant insights into the evolving conditions within adjacent river catchments, thereby revealing the basin dynamics and climate variations. In this study, we used rare earth element (REE) compositions and Sr-Nd-Hf isotope signatures to investigate the provenance of sediments at International Ocean Discovery Program (IODP) Site U1477, located offshore of the Zambezi River mouth, over the past 150 thousand years (ka). These geochemical and isotope proxies indicate that the entire Zambezi River Basin (ZRB) has contributed sediments to the offshore region near the Zambezi River mouth during the last approximately 150 ka. Distinctly unradiogenic εNd and εHf signatures coupled with highly radiogenic 87Sr/86Sr values are indicative of sediment input from the middle and lower reaches of the ZRB. Conversely, more radiogenic εNd and εHf signatures along with unradiogenic 87Sr/86Sr values suggest sediment contributions from the upper reaches. The geochemical and isotope data from Site U1477 thus reveal that substantial changes in the sediment provenance occurred during the Late Pleistocene. By integrating our findings with other paleoclimate records from marine sediments and paleolake cores, we infer that the increased contribution of the upper Zambezi sediment sources to the offshore deposits from approximately 40 ka onwards reflects the reestablishment of the sediment supply from both the upper and middle Zambezi at this time. These changes were likely associated with shifts in the regional rainfall patterns across the ZRB, as well as modifications of the drainage divides due to varying sediment loads resulting from active bedrock erosion following the tectonic uplift on the Chobe fault near the Chobe–Zambezi confluence. This study offers novel insights into the Late Pleistocene evolution of the Zambezi drainage system and is essential for accurately reconstructing regional climate and environmental changes.
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