부산대학교 도서관

Keywords Accretional soils; Pleistocene-Holocene transition; Luminescence dating; Quartz; Magnetic susceptibility Highlights * High-resolution magnetic susceptibility record as paleoclimate proxy. * High-resolution luminescence dating applied on multiple quartz fractions. * Initiation of magnetic susceptibility enhancement dated prior to ~11.7 ka. * Continuous dust accumulation during Pleistocene-Holocene transition and in Holocene. * Accretional Holocene soils in European, Chinese Loess Plateau and US loess sites. Abstract Loess deposits intercalated by paleosols are detailed terrestrial archives of Quaternary climate variability providing information on the global dust cycle and landscape dynamics. Their paleoclimatic significance is often explored by quantifying their mineral magnetic properties due to their sensitivity to local/regional hydroclimate variability. Detailed chronological assessment of such regional proxy records around the climatic transitions allow a better understanding of how regional records react to major global climatic transitions such as the Pleistocene-Holocene climatic transition. Logs of high-resolution magnetic susceptibility and its frequency dependence were used as paleoclimatic proxies to define the environmental transition from the last glacial loess to the current interglacial soil as reflected in nine loess-paleosol sequences across the northern hemisphere, from the Chinese Loess Plateau, the southeastern European loess belt and the central Great Plains, USA. The onset of increase in magnetic susceptibility above typical loess values was used to assess the onset of, and developments during, the Pleistocene-Holocene climatic transition. High-resolution luminescence dating was applied on multiple grain-sizes (4--11 [mu]m, 63--90 [mu]m, 90--125 [mu]m) of quartz extracts from the same sample in order to investigate the timing of Pleistocene-Holocene climatic transition in the investigated sites. The magnetic susceptibility signal shows a smooth and gradual increase for the majority of the sites from the typical low loess values to the interglacial ones. The initiation of this increase, interpreted as recording the initiation of the Pleistocene-Holocene climatic transition at each site, was dated to 14--17.5 ka or even earlier. Our chronological results highlight the need of combining paleoclimatic proxies (magnetic susceptibility) with absolute dating when investigating the Pleistocene-Holocene climatic transition as reflected by the evolution of this proxy in order to avoid chronostratigraphic misinterpretations in loess-paleosol records caused by simple pattern correlation. The detailed luminescence chronologies evidence the continuity of eolian mineral dust accumulation regardless of glacial or interglacial global climatic regimes. Coupled with magnetic susceptibility records this indicates that dust sedimentation and pedogenesis act simultaneously and result in a non-negligible accretional component in the formation of Holocene soils in loess regions across the Northern Hemisphere. The luminescence ages allowed the modeling of accumulation rates for the Holocene soil which are similar for European, Chinese and U.S.A. loess sites investigated and vary from 2 cm ka.sup.-1 to 9 cm ka.sup.-1. While accretional pedogenesis has often been implicitly or explicitly assumed in paleoclimatic interpretation of loess-paleosol sequences, especially in the Chinese Loess Plateau, our luminescence data add direct evidence for ongoing sedimentation as interglacial soils formed. Author Affiliation: (a) Institute for Interdisciplinary Research in Bio-Nano-Sciences, Babes-Bolyai University, Treboniu Laurian 42, 400271 Cluj-Napoca, Romania (b) Institute 'Emil G. RacoviÈa' for research on extreme life conditions, Babes-Bolyai University, Treboniu Laurian 42, 400271 Cluj-Napoca, Romania (c) Department of Geography, University of Wisconsin-Madison, 550 North Park ST, Madison, WI 53706, USA (d) Romanian Academy, Institute of Speleology, Clinicilor 5, 400006 Cluj-Napoca, Romania (e) BayCEER & Chair of Geomorphology, University of Bayreuth, 94450 Bayreuth, Germany (f) Physics Faculty, University of Bucharest, Balcescu 1, 010041 Bucharest, Romania (g) LIAG, Leibniz Institute for Applied Geophysics, Stilleweg 2, Hannover 30655, Germany (h) Key Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China (i) Laboratory for Paleoenvironmental Reconstruction, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia (j) Earth Sciences and Geomorphology Department, Taras Shevchenko National University of Kyiv, Glushkova Prospect 2a, 03127 Kiev, Ukraine (k) Faculty of Environmental Sciences and Engineering, Babes-Bolyai University, Fântânele 30, 400327 Cluj-Napoca, Romania * Corresponding author at: Institute for Interdisciplinary Research in Bio-Nano-Sciences, Babes-Bolyai University, Treboniu Laurian 42, 400271 Cluj-Napoca, Romania. Article History: Received 4 March 2021; Revised 5 August 2021; Accepted 10 August 2021 Byline: D. Constantin [daniela.constantin@ubbcluj.ro] (a,b,*), J.A. Mason (c), D. Veres (d), U. Hambach (e), C. Panaiotu (f), C. Zeeden (g), L. Zhou (h), S.B. Markovic (i), N. Gerasimenko (j), A. Avram (a,k), V. Tecsa (a,k), S.M. Groza-Sacaciu (a,k), L. del Valle Villalonga (a,k), R. Begy (a,b,k), A. Timar-Gabor (a,b,k)