气候变化领域集成服务门户(CCPortal): A remarkable Late Saalian (MIS 6) loess (dust) accumulation in the Lower Danube at Harletz (Bulgaria)

CCPortal

DOI	10.1016/j.quascirev.2019.01.005
	A remarkable Late Saalian (MIS 6) loess (dust) accumulation in the Lower Danube at Harletz (Bulgaria)
	Antoine P.; Lagroix F.; Jordanova D.; Jordanova N.; Lomax J.; Fuchs M.; Debret M.; Rousseau D.-D.; Hatté C.; Gauthier C.; Moine O.; Taylor S.N.; Till J.L.; Coutard S.
发表日期	2019
ISSN	0277-3791
起始页码	80
结束页码	100
卷号	207
英文摘要	While numerous high-resolution studies concerning Last Glacial aeolian sequences are available for Europe, the approach of the penultimate glacial in this geographical area is still poorly developed. In order to bridge this gap, this study focuses on the Bulgarian sequence of Harletz, along the Danube River, where extremely high sedimentation rates allow the depiction of high-resolution signals during MIS 6. At Harletz in NW Bulgaria on the western bank of the Ogosta River (tributary of the Danube) a 20 m thick loess-palaeosols section was cleaned and sampled for a multi-disciplinary study and detailed pedostratigraphic approach. High-resolution continuous bulk sampling (5 cm) was carried out to characterise sedimentary grain size, magnetic properties (including magnetic susceptibility and its frequency dependence), colour reflectance (1 cm), and organic carbon. Geochronological control is based on 16 samples collected for OSL and MET-pIRIR dating. Using a cyclo-stratigraphic approach of the sequence combined with dating constraints provided by both MET-pIRIR dates and the age of a tephra layer occurring at a depth of 12 m within the main loess unit, we can demonstrate that the Harletz section exhibits a 10 m thick Late Saalian (Marine Isotope Stage 6, MIS 6) loess accumulation unique in Europe. The lower part of the main loess unit is 4 m thick and overlies a basal brown soil complex allocated to MIS 7, which includes an exceptionally thick (4 m) and detailed succession of loess and four incipient soil horizons never described in European loess until now. The closest and best-dated high-resolution palaeoenvironmental archive suitable for comparison comes from Lake Ohrid located about 400 km to the SW of Harletz. The Ohrid palynological record shows a progressive step-by-step evolution in climate and in environmental change during the transition between MIS 7 and MIS 6 from which a parallel with the Harletz pedosedimentary succession can be proposed. During the younger part of MIS 6 (160-129ka), steppe vegetation with abundant herbs (Artemisia) is dominant in the Lake Ohrid record, in good accordance with a global enhancement of aeolian dynamics, especially well recorded in sections located close to the Danube River from Serbia to Bulgaria and Romania (L2 loess). According to interpretations stemming from this study, the silts and fine sands building the Harletz loess section would have been transported from the Danube braided river system located (at that time) at about 4.5 km to the NW. Based on our data, the main loess units are characterised by a very low to a total absence of coarse sand particles. By contrast, during the Eemian interglacial (MIS 5e), and to a lesser extent throughout MIS 5 and during MIS 3 interstadials, the long distance transport of silt and fine sand particles is stopped and a weak aeolian sedimentation is likely driven by north-easterly winds transporting coarse sand grains from the proximal Ogosta River sandy banks. Finally, the weak development of Last Glacial loess (4 m max.) likely results from a rapid infilling of the sedimentary trap during the Saalian, then followed by a strong anthropogenic erosion of the topsoil and of the upper part of the loess profile since the Early Holocene (Neolithic). © 2019 Elsevier Ltd
英文关键词	Danube; Europe; Grain size; High-resolution; Luminescence dating; Magnetic susceptibility; Pleistocene; Saalian
语种	英语
scopus关键词	Climate change; Geochronology; Glacial geology; Grain size and shape; Lakes; Magnetic susceptibility; Magnetism; Organic carbon; Rivers; Sand; Sedimentology; Sediments; Stratigraphy; Danube; Europe; Grain size; High resolution; Luminescence dating; Pleistocene; Saalian; Silt; braided river; brown soil; Eemian; environmental change; Holocene; interglacial; Last Glacial; loess; magnetic susceptibility; river system; Saalian; soil horizon; steppe; tephra; topsoil; Bulgaria; Danube River; Lake Ohrid; Ogosta River; Romania; Artemisia
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/152012
作者单位	Laboratoire de Géographie Physique: Environnements Quaternaires et Actuels, CNRS-Univ. Paris 1-UPEC, Meudon, 92195, France; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ Paris Diderot, UMR 7154 CNRS, Paris, 75005, France; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 3, Sofia, 1113, Bulgaria; Department of Geography, Justus-Liebig-University Giessen, Giessen, 35390, Germany; UFR Sciences et Techniques, Université de Rouen, Mont-Saint-Aignan, 76821, France; Laboratoire de Météorologie Dynamique, Institute Pierre Simon Laplace, IPSL, Paris Sciences & Lettres (PSL) Research University, UMR CNRS-ENS 8539, Paris, 75231, France; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91198, France; Institute of Earth Sciences, University of Iceland, 101 Reykjavik, Iceland;...
推荐引用方式 GB/T 7714	Antoine P.,Lagroix F.,Jordanova D.,et al. A remarkable Late Saalian (MIS 6) loess (dust) accumulation in the Lower Danube at Harletz (Bulgaria)[J],2019,207.
APA	Antoine P..,Lagroix F..,Jordanova D..,Jordanova N..,Lomax J..,...&Coutard S..(2019).A remarkable Late Saalian (MIS 6) loess (dust) accumulation in the Lower Danube at Harletz (Bulgaria).Quaternary Science Reviews,207.
MLA	Antoine P.,et al."A remarkable Late Saalian (MIS 6) loess (dust) accumulation in the Lower Danube at Harletz (Bulgaria)".Quaternary Science Reviews 207(2019).