DOI: 10.1016/j.palaeo.2016.07.022
论文题名: Geochemistry unravels MIS 3/2 paleoenvironmental dynamics at the loess–paleosol sequence Schwalbenberg II, Germany
作者: Profe J. ; Zolitschka B. ; Schirmer W. ; Frechen M. ; Ohlendorf C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 459 起始页码: 537
结束页码: 551
语种: 英语
英文关键词: Dust-provenance index
; Middle Rhine valley
; Paleoclimatology
; Weathering index
; XRF-scanning of discrete samples
英文摘要: The Schwalbenberg II loess–paleosol sequence (LPS) denotes a key site for Marine Isotope Stage (MIS) 3 in Western Europe owing to eight succeeding cambisols, which primarily constitute the Ahrgau Subformation. Therefore, this LPS qualifies as a test candidate for the potential of temporal high-resolution geochemical data obtained by X-ray fluorescence (XRF) scanning of discrete samples providing a fast and non-destructive tool for determining the element composition. The geochemical data is first contextualized to existing proxy data such as magnetic susceptibility (MS) and organic carbon (Corg) and then aggregated to element log ratios characteristic for weathering intensity [LOG (Ca/Sr), LOG (Rb/Sr), LOG (Ba/Sr), LOG (Rb/K)] and dust provenance [LOG (Ti/Zr), LOG (Ti/Al), LOG (Si/Al)]. Generally, an interpretation of rock magnetic particles is challenged in western Europe, where not only magnetic enhancement but also depletion plays a role. Our data indicates leaching and top-soil erosion induced MS depletion at the Schwalbenberg II LPS. Besides weathering, LOG (Ca/Sr) is susceptible for secondary calcification. Thus, also LOG (Rb/Sr) and LOG (Ba/Sr) are shown to be influenced by calcification dynamics. Consequently, LOG (Rb/K) seems to be the most suitable weathering index identifying the Sinzig Soils S1 and S2 as the most pronounced paleosols for this site. Sinzig Soil S3 is enclosed by gelic gleysols and in contrast to S1 and S2 only initially weathered pointing to colder climate conditions. Also the Remagen Soils are characterized by subtle to moderate positive excursions in the weathering indices. Comparing the Schwalbenberg II LPS with the nearby Eifel Lake Sediment Archive (ELSA) and other more distant German, Austrian and Czech LPS while discussing time and climate as limiting factors for pedogenesis, we suggest that the lithologically determined paleosols are in-situ soil formations. The provenance indices document a Zr-enrichment at the transition from the Ahrgau to the Hesbaye Subformation. This is explained by a conceptual model incorporating multiple sediment recycling and sorting effects in eolian and fluvial domains. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68285
Appears in Collections: 过去全球变化的重建
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作者单位: GEOPOLAR, Institute of Geography, University of Bremen, Celsiusstraße FVG, Bremen, Germany; former Department of Geology, Heinrich Heine University Düsseldorf, Moorenstraße 5, Düsseldorf, Germany; Department of Geochronology and Isotope Hydrology, Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, Hannover, Germany; Wolkenstein 24, Ebermannstadt, Germany
Recommended Citation:
Profe J.,Zolitschka B.,Schirmer W.,et al. Geochemistry unravels MIS 3/2 paleoenvironmental dynamics at the loess–paleosol sequence Schwalbenberg II, Germany[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,459