A. L. Deino, René Dommain, C. B. Keller, R. Potts, A. K. Behrensmeyer, E. J. Beverly, J. King, C. W. Heil, M. Stockhecke, E. T. Brown, J. Moerman, P. deMenocal, D. Deocampo, Yannick Garcin, N. E. Levin, R. Lupien, R. B. Owen, N. Rabideaux, J. M. Russell, J. Scott, S. Riedl, K. Brady, J. Bright, J. B. Clark, A. Cohen, J. T. Faith, A. Noren, V. Muiruri, R. Renaut, S. Rucina, K. Uno
- The Olorgesailie Drilling Project and the related Hominin Sites and Paleolakes Drilling Project in East Africa were initiated to test hypotheses and models linking environmental change to hominin evolution by drilling lake basin sediments adjacent to important archeological and paleoanthropological sites. Drill core OL012-1A recovered 139 m of sedimentary and volcaniclastic strata from the Koora paleolake basin, southern Kenya Rift, providing the opportunity to compare paleoenvironmental influences over the past million years with the parallel record exposed at the nearby Olorgesailie archeological site. To refine our ability to link core-to-outcrop paleoenvironmental records, we institute here a methodological framework for deriving a robust age model for the complex lithostratigraphy of OL012-1A. Firstly, chronostratigraphic control points for the core were established based on 4 Ar/39Ar ages from intercalated tephra deposits and a basal trachyte flow, as well as the stratigraphic position of the Brunhes-Matuyama geomagneticThe Olorgesailie Drilling Project and the related Hominin Sites and Paleolakes Drilling Project in East Africa were initiated to test hypotheses and models linking environmental change to hominin evolution by drilling lake basin sediments adjacent to important archeological and paleoanthropological sites. Drill core OL012-1A recovered 139 m of sedimentary and volcaniclastic strata from the Koora paleolake basin, southern Kenya Rift, providing the opportunity to compare paleoenvironmental influences over the past million years with the parallel record exposed at the nearby Olorgesailie archeological site. To refine our ability to link core-to-outcrop paleoenvironmental records, we institute here a methodological framework for deriving a robust age model for the complex lithostratigraphy of OL012-1A. Firstly, chronostratigraphic control points for the core were established based on 4 Ar/39Ar ages from intercalated tephra deposits and a basal trachyte flow, as well as the stratigraphic position of the Brunhes-Matuyama geomagnetic reversal. This dataset was combined with the position and duration of paleosols, and analyzed using a new Bayesian algorithm for high-resolution age-depth modeling of hiatus-bearing stratigraphic sections. This model addresses three important aspects relevant to highly dynamic, nonlinear depositional environments: 1) correcting for variable rates of deposition, 2) accommodating hiatuses, and 3) quantifying realistic age uncertainty with centimetric resolution. Our method is applicable to typical depositional systems in extensional rifts as well as to drill cores from other dynamic terrestrial or aquatic environments. We use the core age model and lithostratigraphy to examine the inter connectivity of the Koora Basin to adjacent areas and sources of volcanism. (C) 2019 Elsevier Ltd. All rights reserved.…
MetadatenAuthor details: | A. L. Deino, René DommainORCiD, C. B. Keller, R. Potts, A. K. Behrensmeyer, E. J. Beverly, J. King, C. W. Heil, M. Stockhecke, E. T. Brown, J. Moerman, P. deMenocal, D. Deocampo, Yannick GarcinORCiD, N. E. Levin, R. Lupien, R. B. Owen, N. Rabideaux, J. M. Russell, J. Scott, S. Riedl, K. Brady, J. Bright, J. B. Clark, A. Cohen, J. T. Faith, A. Noren, V. Muiruri, R. Renaut, S. Rucina, K. Uno |
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DOI: | https://doi.org/10.1016/j.quascirev.2019.05.009 |
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ISSN: | 0277-3791 |
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Title of parent work (English): | Quaternary science reviews : the international multidisciplinary research and review journal |
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Publisher: | Elsevier |
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Place of publishing: | Oxford |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2019 |
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Publication year: | 2019 |
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Creating corporation: | Olorgesailie Drilling Project Sci |
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Release date: | 2021/01/19 |
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Tag: | Bayesian modeling; East Africa; Kenya Rift; Magnetostratigraphy; Paleolimnology; Pleistocene; Radiogenic isotopes; Sedimentology; Tephrostratigraphy; paleosol |
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Volume: | 215 |
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Number of pages: | 19 |
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First page: | 213 |
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Last Page: | 231 |
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Funding institution: | National Museums of Kenya; Oldonyo Nyokie Group Ranch; Peter Buck Fund for Human Origins Research (Smithsonian); William H. Donner Foundation; National Science FoundationNational Science Foundation (NSF) [EAR 1322017]; Smithsonian Postdoctoral FellowshipSmithsonian Institution; Geo. X, the Research Network for Geosciences in Berlin, Germany; Geo. X, the Research Network for Geosciences in Potsdam, Germany; Swiss National Science FoundationSwiss National Science Foundation (SNSF) [P300P2 158501] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer review: | Referiert |
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