气候变化领域集成服务门户(CCPortal): Chronostratigraphic model of a high-resolution drill core record of the past million years from the Koora Basin; south Kenya Rift: Overcoming the difficulties of variable sedimentation rate and hiatuses

CCPortal

DOI	10.1016/j.quascirev.2019.05.009
	Chronostratigraphic model of a high-resolution drill core record of the past million years from the Koora Basin; south Kenya Rift: Overcoming the difficulties of variable sedimentation rate and hiatuses
	Deino A.L.; Dommain R.; Keller C.B.; Potts R.; Behrensmeyer A.K.; Beverly E.J.; King J.; Heil C.W.; Stockhecke M.; Brown E.T.; Moerman J.; deMenocal P.; the Olorgesailie Drilling Project Scientific Team
发表日期	2019
ISSN	0277-3791
起始页码	213
结束页码	231
卷号	215
英文摘要	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 OLO12-1A 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 OLO12-1A. Firstly, chronostratigraphic control points for the core were established based on 40Ar/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, non-linear 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 interconnectivity of the Koora Basin to adjacent areas and sources of volcanism. © 2019 Elsevier Ltd
英文关键词	Bayesian modeling; East Africa; Kenya Rift; Magnetostratigraphy; Paleolimnology; paleosol; Pleistocene; Radiogenic isotopes; Sedimentology; Tephrostratigraphy
语种	英语
scopus关键词	Bayesian networks; Deposition; Drills; Geologic models; Geomagnetism; Infill drilling; Paleolimnology; Sedimentology; Stratigraphy; Bayesian model; East Africa; Kenya rift; Magnetostratigraphy; paleosol; Pleistocene; Radiogenic isotopes; Tephrostratigraphy; Core drilling; algorithm; archaeology; Bayesian analysis; chronostratigraphy; depositional environment; drill bit; drilling; environmental change; extensional tectonics; historical record; hominid; human evolution; hypothesis testing; isotopic analysis; lacustrine deposit; lithostratigraphy; magnetic reversal; magnetostratigraphy; numerical model; paleoenvironment; paleohydrology; paleolimnology; paleosol; Pleistocene; sedimentation rate; sedimentology; tectonostratigraphy; volcaniclastic deposit; volcanism; East Africa; East African Rift; Kenya; Kenya Rift
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151896
作者单位	Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, United States; Human Origins Program, National Museum of Natural History, Smithsonian Institution, Washington, DC, 20013-7012, United States; Institute of Geosciences, University of Potsdam, Karl-Liebknecht-Straße 24-25, Potsdam-Golm, 14476, Germany; Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States; Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC, 20013-7012, United States; University of Houston, Department of Earth and Atmospheric Sciences, Science & Research Building 1, 3507 Cullen Blvd, Rm. 312, Houston, TX 77204-5007, United States; Graduate School of Oceanography, University of Rhode Island, South Ferry Road, Narragansett, RI 02882, United States; Large Lakes Observatory, University of Minnesota Duluth, Duluth, MN 55812, United States; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY 10964, United States; L...
推荐引用方式 GB/T 7714	Deino A.L.,Dommain R.,Keller C.B.,et al. Chronostratigraphic model of a high-resolution drill core record of the past million years from the Koora Basin; south Kenya Rift: Overcoming the difficulties of variable sedimentation rate and hiatuses[J],2019,215.
APA	Deino A.L..,Dommain R..,Keller C.B..,Potts R..,Behrensmeyer A.K..,...&the Olorgesailie Drilling Project Scientific Team.(2019).Chronostratigraphic model of a high-resolution drill core record of the past million years from the Koora Basin; south Kenya Rift: Overcoming the difficulties of variable sedimentation rate and hiatuses.Quaternary Science Reviews,215.
MLA	Deino A.L.,et al."Chronostratigraphic model of a high-resolution drill core record of the past million years from the Koora Basin; south Kenya Rift: Overcoming the difficulties of variable sedimentation rate and hiatuses".Quaternary Science Reviews 215(2019).