Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives

Grygar, Tomáš Matys; Mach, Karel; Hron, Karel; Fačevicová, Kamila; Martínez, Mathieu; Zeeden, Christian; Schnabl, Petr

doi:10.1016/j.sedgeo.2020.105717

Cited by 10 publications

(6 citation statements)

References 83 publications

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“…It can be clearly seen that the lowest VWI values could be detected at the sediment base of the clayey loam between 102.6 and 102.8 m a.s.l. This is clear evidence of weathering and thus soil formation, which is also validated by the K 2 O/Rb 2 O ratio because there is greater retention and thus slower release of heavier alkali metal ions (Rb + ) from clay minerals compared to the lighter alkali metal ion (K + ) (Bosq et al, 2020;Matys Grygar et al, 2020). In comparison to Na and Ca, a possible resorption of K to clay minerals and its stronger binding through sorptive complexes in the soil are considered to be more likely.…”

Section: Late Weichselian-holocene Transitionmentioning

confidence: 79%

Late Weichselian–Holocene valley development of the Elbe valley near Dresden – linking sedimentation, soil formation and archaeology

Tinapp,

Selzer,

Döhlert-Albani

et al. 2023

E&G Quaternary Sci. J.

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Abstract. Valley infills are essential for understanding changes in hydrology and landscape. Anthropogenic activities are proven by prehistoric settlement remains, which mark distinct sediments and soils as usable land during certain time periods. In 2009 and 2018/19, excavations by the Saxonian Archaeological Heritage Office were conducted in the Elbe valley between Meißen and Dresden, preceding the construction of two natural gas pipelines. As a result, two important multicultural prehistoric sites were discovered on the Lower Weichselian Terrace (LWT) in different sediments and on varying stratigraphic levels. During this study sediments and soils at the excavation sites and throughout the pipe trench have been documented. Micromorphological, sedimentological and geochemical investigations and analyses of archaeobotanical and archaeological finds, complemented by 14C and optically stimulated luminescence (OSL) dating, enabled deciphering the structure of sediments and soils. Two major sites were the focus. At the Clieben site, an early Neolithic settlement and former topsoil, developed in a Weichselian valley loam above gravels and sands, are covered by younger overbank fines. At the Brockwitz site, shallow incision channels in the LWT were filled with clayey overbank fines during the Preboreal. An overprinting humic soil horizon was later anthropogenically overprinted during the early and middle Neolithic period. An omnipresent layer of Subboreal or younger overbank fines, covering the majority of the LWT in combination with the spatially confined Preboreal overbank fines, mirrors the ever-growing risk of flooding in a formerly attractive settlement area.

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Section: Late Weichselian-holocene Transitionmentioning

confidence: 79%

Late Weichselian–Holocene valley development of the Elbe valley near Dresden – linking sedimentation, soil formation and archaeology

Tinapp,

Selzer,

Döhlert-Albani

et al. 2023

E&G Quaternary Sci. J.

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“…There can be found also a full description of sediment geochemistry data processing. Two geochemical parameters were evaluated: K/Rb as a proxy for chemical weathering intensity (Matys Grygar et al, 2020) and Pb/Si as a quantitative measure of anthropogenic contamination since the 20th century ce (Matys Grygar et al, 2013). Deviations of the K/Rb and Pb/Si ratios from average behaviour were evaluated as exponential forms of the robust regression residuals (denoted as RRes in figures).…”

Section: Methodsmentioning

confidence: 99%

Section: Geochemical Data Processingmentioning

confidence: 99%

Was the termination of the Jizera River meandering during the Late Holocene caused by anthropogenic or climatic forcing?

Elznicová

Kiss

Suchodoletz

et al. 2022

Earth Surf Processes Landf

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The Jizera River in Czechia is a typical mid-sized Central European watercourse. Its floodplain shows a morphological contrast between the laterally stable low-sinuous current channel and preserved palaeomeanders. The aim of this paper was to date and explain the obvious metamorphosis of the channel pattern from meandering to low-sinuous. We analysed the morphology of the lower river reach using a digital terrain model (DTM) and historical maps from the 1840s. Furthermore, the floodplain architecture was described based on the DTM, geophysical imaging (ground penetrating radar, GPR), sediment lithology and anthropogenic contamination using geochemical proxies, and optically stimulated luminescence (OSL) dating. The geochemical proxies were processed using log-ratio methods from the compositional data analysis toolbox. According to our results the Jizera River showed signs of systematic lateral floodplain reworking during the Late Holocene with only minor aggradation, although parts of the catchment are covered by easily erodible loess.Interestingly, vertical aggradation did not show a significant increase during the last millennium. In the main study area, this limited vertical aggradation resulted in the preservation of palaeomeander fragments and palaeochannel belts with 100-200 m mean width in the 300-600 m wide floodplain, which are recognisable in the topography and in subsurface GPR imaging. This channel meandering took place between around 4 and 1.2 ka, and the transition towards the laterally stable modern channel with low sinuosity occurred around 1.2 ka. This timing indicates a climatic rather than anthropogenic impact, which was rather weak around that time. One likely cause for this transition was the influx of material from ravines incised into the sandstone valley edges during past climatic extremes. Subsequently, the re-establishment of a meandering pattern was possibly prevented by a combination of low fluvial activity and the construction of weirs that reduced stream power.

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“…There are four main types of data series that are used to analyse the presence of Milankovitch cycles from sedimentary records. The first category is a physical property of the rocks, such as colour, particle size and bedding rhythms (Grygar et al ., 2020; Ma & Li, 2020). The second category is geochemical data, such as Fe or Al elemental content, CaCO 3 mass fraction, major element content, trace element content, or elemental ratios (Meyers & Sageman, 2007; Li et al ., 2018; Cheng et al ., 2020).…”

Section: Methodsmentioning

confidence: 99%

Astronomical calibration of a ten‐million‐year Triassic lacustrine record in the Ordos Basin, North China

2022

Sedimentology

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The division of geological time is of general interest as this allows a better understanding of the geological processes and Earth's evolutionary history. Astrochronology provides a way to evaluate high-resolution timescales of Earth's climate changes. Astronomical tuning of orbitally forced stratigraphic records to construct astronomical-calibrated timescales has led to a progressive refinement of the geological timescale over the last decades. However, the Triassic remains a relatively weak link. A large lake with an area of 370 000 square kilometres formed in the Ordos Basin in North China during the Triassic Period. It has been demonstrated that the sedimentary deposits of the seventh Oil Member (Chang 7 Member) of the Triassic Yanchang Formation in the southern Ordos Basin responded to astronomically forced climate changes. However, the constructed astronomical-calibrated timescales failed to reach an agreement. This study presents natural gamma ray logs and geochemical climate record of Fe and Al concentrations from the southern Ordos Basin margin that are dated precisely from 239 to 229 Ma by combined U-Pb dating and astrochronology. Therefore, the Chang 7 Member was deposited during the Ladinian and Carnian (late Middle through to earliest Late Triassic), this knowledge will refine the Triassic astronomical scale. The distribution of detrital zircon dates shows that the Chang 7 Member in the southern Ordos Basin has multiple provenance characteristics. The southern Ordos Basin is far from this provenance area, which is reflected in the low sediment accumulation rate (0.5 to 2.0 cm/kyr). In contrast to the lower part of Yanchang Formation underlying the Chang 7 Member, the large tuffs and seismites from the bottom of Chang 7 Member indicate the initiation of tectonic collision between North Qinling orogenic belt and the southern margin of the Ordos Basin.

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Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives

Cited by 10 publications

References 83 publications

Late Weichselian–Holocene valley development of the Elbe valley near Dresden – linking sedimentation, soil formation and archaeology

Late Weichselian–Holocene valley development of the Elbe valley near Dresden – linking sedimentation, soil formation and archaeology

Was the termination of the Jizera River meandering during the Late Holocene caused by anthropogenic or climatic forcing?

Astronomical calibration of a ten‐million‐year Triassic lacustrine record in the Ordos Basin, North China

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