Geochemistry unravels MIS 3/2 paleoenvironmental dynamics at the loess–paleosol sequence Schwalbenberg II, Germany

Profe, Jörn; Zolitschka, Bernd; Schirmer, Wolfgang; Frechen, Manfred; Ohlendorf, Christian

doi:10.1016/j.palaeo.2016.07.022

Cited by 30 publications

(24 citation statements)

References 81 publications

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“…Results suggest differences in LPS formation and/or preservation throughout OIS 2 and OIS 4, whereas the sections covering OIS 3 show comparable composition and thickness further upslope. In addition, Klasen et al (2015) and Profe et al (2016) conducted geochemical analyses by means of x-ray fluorescence measurements. While Klasen et al (2015) assumed changing source areas to cause differences in luminescence behaviour, Profe et al (2016) reconstructed weathering indices and a conceptual model including multiple sediment recycling and sorting effects.…”

Section: Regional Settingsmentioning

confidence: 99%

“…In addition, Klasen et al (2015) and Profe et al (2016) conducted geochemical analyses by means of x-ray fluorescence measurements. While Klasen et al (2015) assumed changing source areas to cause differences in luminescence behaviour, Profe et al (2016) reconstructed weathering indices and a conceptual model including multiple sediment recycling and sorting effects. In FIGURE 1 | Overview of the Schwalbenberg site in the Lower Middle Rhine Valley, Germany.…”

Section: Regional Settingsmentioning

confidence: 99%

“…Schirmer and co-workers (e.g., Schirmer, 2012;Schirmer et al, 2012) formerly investigated a 13 m thick LPS outcrop (white dot). Later on, geochemical investigations (XRF) were performed on samples derived from this outcrop by Profe et al (2016). Sediment core (REM 1A) was obtained in mid-slope position by Klasen et al (2015) trying to develop a luminescence chronology.…”

Section: Regional Settingsmentioning

confidence: 99%

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Combining Inorganic and Organic Carbon Stable Isotope Signatures in the Schwalbenberg Loess-Palaeosol-Sequence Near Remagen (Middle Rhine Valley, Germany)

et al. 2020

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Western Central European Loess-Palaeosol-Sequences (LPS) provide valuable terrestrial records of palaeoenvironmental conditions, which formed in response to variability in the North Atlantic climate systems. Over the last full glacial cycle (∼130 ka), climate oscillations within these systems are best documented in deep sea-and ice cores; the responses of terrestrial systems are not yet fully understood. A better understanding of metabolism governing input and output variables of organic-and inorganic C pools is, however, crucial for investigating landscape-atmospheric feedback processes and in particularly, for understanding the formation of calcareous LPS as environmental archives. Here we quantify the contributions of primary carbonates (PC) and secondary carbonates (SC) to the overall inorganic carbon pool down a LPS at the Schwalbenberg site, based on the natural abundance ratio of stable carbon isotopes (δ 13 C) and contents of the organic-and inorganic C pools. This facilitates detailed insights into the carbonate metabolism and hence, loessification and percolation processes. PC accumulate predominantly in cold phases during periods of reduced biological activity and become leached during wetter and warmer periods contemporary with higher rates of SC re-precipitation and total organic carbon (TOC) increases due to enhanced biomass production. We find that mineral dust input is most significant during stadials, as well as toward the end of warmer interstadials, characterised by gradual cooling back to stadial conditions. Pedogenesis in the Schwalbenberg LPS kept pace with surface accumulation of mineral dust. This indicates that palaeosols are of accretionary nature, which gives raise to the idea of incorporation of former topsoils in preserved subsoil horizons. Our study decodes fundamental aspects of the link between atmospheric dust circulation and terrestrial records in western Central Europe. In addition, interdependencies between factors governing the regional moisture budged and LPS can be reconstructed in a more holistic way than before.

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Section: Regional Settingsmentioning

confidence: 99%

Section: Regional Settingsmentioning

confidence: 99%

Section: Regional Settingsmentioning

confidence: 99%

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Combining Inorganic and Organic Carbon Stable Isotope Signatures in the Schwalbenberg Loess-Palaeosol-Sequence Near Remagen (Middle Rhine Valley, Germany)

et al. 2020

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“…Subsequent data processing for such a run involves deletion of every second spectrum which are biased by the acrylic glass rims of the sample cups (Ohlendorf, 2018), recalculation of a new sum spectrum containing sample spectra only, fit optimization of the new sum spectrum and batch processing of the sample spectra. This measurement protocol was applied to samples of several loess-paleosol sequences as these are usually discretely sampled and characterized by silt-sized particles which facilitates sample preparation (Profe et al, 2018a;Profe et al, 2018b;Profe et al, 2016;Zolitschka et al, 2014). All measurements yielded good data repeatability with a mean relative standard deviation of < 1.5 % for main elements except for Al (14.3 %) and Ba (14.9 %).…”

Section: Discrete Samples and Powdered Samplesmentioning

confidence: 99%

Practical guidelines and recent advances in the Itrax XRF core-scanning procedure

Löwemark

Bloemsma²,

Croudace

et al. 2019

Quaternary International

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XRF core scanning has evolved to become a standard analytical technique for the rapid assessment of elemental, density and textural variations in a wide range of sediments and other materials, with applications ranging from palaeoceanography, paleoclimatology, geology, and environmental forensics to environmental protection. In general, scanning provides rapid, non-destructive acquisition of elemental and textural variations at sub-millimetre resolution for a wide range of materials. Numerous procedural adaptations have been developed for the growing number of applications, such as analyses of unconsolidated, water-rich sediments, powdered soil samples, or resin bags. Here, practical expertise and guidance from the Itrax community, gained over 15 years, is presented that should provide insights for new and experienced users.

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“…[7,9] Such methods usually require the quantita- [10] and has been applied already in several studies. [11,12] However, it can potentially be adapted to other XRF core scanners with minor modifications.…”

Section: Introductionmentioning

confidence: 99%

A sample carrier for measuring discrete powdered samples with an ITRAX XRF core scanner

Ohlendorf

2017

X-Ray Spectrometry

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The elemental composition of discrete powdered sediment samples can be measured by the energy-dispersive X-ray fluorescence (XRF) system that is installed in XRF core scanners. Because an appropriate sample carrier for powdered samples is currently not available, for example, for the ITRAX XRF core scanner, such a carrier is presented in this technical note. The designed sample carrier can hold 30 sample cups with a volume of 0.88 cm 3 each. A maximum of 5 sample carriers, that is, 150 samples, can be measured in one run. The sample cups and carriers are optimized for a measurement procedure with a step size of 5 mm and variable count times up to 100 s per sample. With this setting, data are collected from an area of 100 mm 2 in the center of the sample thereby ensuring a good representativeness of the signal because potential sample inhomogeneity is accounted for. Because the described sample carrier system allows rapid element analyses of discrete powdered environmental samples with an XRF core scanner, it may in some cases represent a time-and cost-efficient alternative to conventional XRF analyses.

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Geochemistry unravels MIS 3/2 paleoenvironmental dynamics at the loess–paleosol sequence Schwalbenberg II, Germany

Cited by 30 publications

References 81 publications

Combining Inorganic and Organic Carbon Stable Isotope Signatures in the Schwalbenberg Loess-Palaeosol-Sequence Near Remagen (Middle Rhine Valley, Germany)

Combining Inorganic and Organic Carbon Stable Isotope Signatures in the Schwalbenberg Loess-Palaeosol-Sequence Near Remagen (Middle Rhine Valley, Germany)

Practical guidelines and recent advances in the Itrax XRF core-scanning procedure

A sample carrier for measuring discrete powdered samples with an ITRAX XRF core scanner

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