气候变化领域集成服务门户(CCPortal): Plio-Pleistocene sedimentation in West Turkana (Turkana Depression, Kenya, East African Rift System): Paleolake fluctuations, paleolandscapes and controlling factors

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DOI	10.1016/j.earscirev.2020.103415
	Plio-Pleistocene sedimentation in West Turkana (Turkana Depression, Kenya, East African Rift System): Paleolake fluctuations, paleolandscapes and controlling factors
	Nutz A.; Schuster M.; Barboni D.; Gassier G.; Van Bocxlaer B.; Robin C.; Ragon T.; Ghienne J.-F.; Rubino J.-L.
发表日期	2020
ISSN	00128252
卷号	211
英文摘要	Pliocene and Pleistocene sediments from West Turkana (Kenya, East African Rift System) form emblematic syn-rift successions for understanding the evolution of extensional basin and continental rifting. They also constitute world-renowned fossil-bearing strata from which >500 hominin fossils were discovered over the past decades, with >100 inventoried archeological sites. However, associated sedimentary dynamics and architectures as well as paleoenvironments are only partially reconstructed and the relative contribution of climate and tectonism to paleoenvironmental change over time remains unclear. Here, through the interpretation of sedimentary facies, the delineation of sequences and the analysis of δ13C in soil carbonates, we provide the first exhaustive reconstruction from ~4.00 to ~0.75 Ma of (i) fluctuations of the paleolake that occupied the Turkana Depression, (ii) the successive sedimentary dynamics and related paleolandscapes that characterized the West Turkana area and (iii) respective roles of climate and tectonism in the sedimentation. We show evidence for seven major transgression-regression (T-R) cycles between ~4.00 and ~ 0.75 Ma superimposed locally by lower amplitude T-R cycles. Comparing the sedimentological interpretations and the δ13C values in soil carbonates (literature data), we reveal that fluctuations of rainfall over the Ethiopian Dome, which hosts the drainage basin of the Omo River — the main tributary of Lake Turkana — controlled high-amplitude lake level fluctuations during the Plio-Pleistocene period. We also demonstrate that vegetation and tree cover evolved differently in the Omo Valley and West Turkana. Furthermore we outline that two different sedimentary systems reflecting two distinct modes of sedimentation alternated through times in the West Turkana area as a response to the variations in sediment supply coming from the western rift shoulder (i.e. Lapurr Range) that alternatively generated wave- or river-dominated sedimentary systems. In conclusion, we reveal that climate regulated water input, paleolake water-level fluctuations and vegetation. Tectonism determined sediment supply to the basin controlled in West Turkana by pulses of increased activity of the main border fault (i.e., the Murua Rith Lapurr Fault). © 2020 Elsevier B.V.
关键词	Nachukui Fm Omo Group Pliocene Rift basin
英文关键词	facies analysis; paleoclimate; paleoenvironment; paleolimnology; Pliocene-Pleistocene boundary; rift zone; sedimentation; transgression-regression cycle; East African Rift; Kenya; Turkana
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203831
作者单位	CEREGE, Aix-Marseille Université, CNRS, IRD, Collège de France, INRA, Aix en Provence, France; Institut de Physique du Globe de Strasbourg (IPGS), UMR 7516 CNRS, Université de Strasbourg, EOST, 1 rue Blessig, Strasbourg, 67084, France; Evo-Eco-Paleo, UMR 8198 CNRS, Université de Lille, Bâtiment SN2, Cité Scientifique, Lille, 59000, France; Laboratoire Géosciences Rennes, Université de Rennes 1, UMR 6118 CNRS/INSU, Campus de Beaulieu, Rennes, 35042, France; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; Total S.A., CSTJF, Avenue Larribau, Pau, Cedex 64018, France
推荐引用方式 GB/T 7714	Nutz A.,Schuster M.,Barboni D.,et al. Plio-Pleistocene sedimentation in West Turkana (Turkana Depression, Kenya, East African Rift System): Paleolake fluctuations, paleolandscapes and controlling factors[J],2020,211.
APA	Nutz A..,Schuster M..,Barboni D..,Gassier G..,Van Bocxlaer B..,...&Rubino J.-L..(2020).Plio-Pleistocene sedimentation in West Turkana (Turkana Depression, Kenya, East African Rift System): Paleolake fluctuations, paleolandscapes and controlling factors.Earth Science Reviews,211.
MLA	Nutz A.,et al."Plio-Pleistocene sedimentation in West Turkana (Turkana Depression, Kenya, East African Rift System): Paleolake fluctuations, paleolandscapes and controlling factors".Earth Science Reviews 211(2020).