A critical reevaluation of palaeoclimate proxy records from loess in the Carpathian Basin

Obreht, Igor; Zeeden, Christian; Hambach, Ulrich; Vereș, Daniel; Marković, Slobodan B.; Lehmkuhl, Frank

doi:10.1016/j.earscirev.2019.01.020

Cited by 69 publications

(50 citation statements)

References 239 publications

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“…; Obreht et al . ). In particular, trends observed in environmental magnetic proxies have allowed for insights into the regional past long‐term climatic and environmental variability, as well as attempts at chronostratigraphical correlations amongst different sections (Marković et al .…”

Section: Resultsmentioning

confidence: 97%

Testing polymineral post‐IR IRSLand quartzSAR‐OSLprotocols on Middle to Late Pleistocene loess at Batajnica, Serbia

Avram

Constantin

Vereș

et al. 2020

Boreas

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The loess–palaeosol sequence of Batajnica (Vojvodina region, Serbia) is considered as one of the most complete and thickest terrestrial palaeoclimate archives for the Middle and Late Pleistocene. In order to achieve a numerical chronology for this profile, four sets of ages were obtained on 18 individual samples. Equivalent doses were determined using the SAR protocol on fine (4–11 μm) and coarse (63–90 μm) quartz fractions, as well as on polymineral fine grains by using two elevated temperature infrared stimulation methods, pIRIR290 and pIRIR225. We show that the upper age limit of coarse quartz OSL and polymineral pIRIR290 and pIRIR225 techniques is restricted to the Last Glacial/Interglacial cycle due to the field saturation of the natural signals. Luminescence ages on coarse quartz, pIRIR225 and pIRIR290 polymineral fine grains are in general agreement. Fine quartz ages are systematically lower than the coarse quartz and pIRIR ages, the degree of underestimation increasing with age. Comparison between natural and laboratory dose response curves indicate the age range over which each protocol provides reliable ages. For fine and coarse quartz, the natural and laboratory dose response curves overlap up to ~150 and ~250 Gy, respectively, suggesting that the SAR protocol provides reliable ages up to c. 50 ka on fine quartz and c. 100 ka on coarse quartz. Using the pIRIR225 and pIRIR290 protocols, equivalent doses up to ~400 Gy can be determined, beyond which in the case of the former the natural dose response curve slightly overestimates the laboratory dose response curve. Our results suggest that the choice of the mineral and luminescence technique to be used for dating loess sediments should take into consideration the reported limited reliability.

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Section: Resultsmentioning

confidence: 97%

Testing polymineral post‐IR IRSLand quartzSAR‐OSLprotocols on Middle to Late Pleistocene loess at Batajnica, Serbia

Avram

Constantin

Vereș

et al. 2020

Boreas

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“…In that way, patterns from pedo-complexes in Armenian LPSs pointing to the dominance of nC 31 and nC 33 chain lengths might be a response to a stressful environment (e.g., pronounced irradiation or very dry warm summers), boosting the production of the longer n-alkane chain lengths nC 31 and nC 33. Likewise, it may be expected that, during glacial conditions, a shortening of the n-alkane chain length produced by grasses and herbs may occur due to a decrease in temperature and the enhanced aridity [62]. Thus, the detected fossil n-alkane signal could reflect environmental conditions rather than the vegetation source itself.…”

Section: "Vegetation Source" Versus Environmental Control Of Detectedmentioning

confidence: 99%

First Calibration and Application of Leaf Wax n-Alkane Biomarkers in Loess-Paleosol Sequences and Modern Plants and Soils in Armenia

Trigui¹,

Wolf²,

Sahakyan

et al. 2019

Geosciences

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Interpreting paleoenvironmental conditions by means of n-alkane biomarker analyses is challenging because results depend on different influencing factors. Thus, regional calibration of n-alkane patterns is needed because of different plant chemo-taxonomic behavior. We investigated for the first-time leaf wax-derived n-alkane biomarkers from modern plants, litter, top soils, and two recently discovered loess-paleosol sequences (LPSs) in Armenia (Lesser Caucasus). Our results on modern samples show a promising discrimination power based on n-alkane chain length nC33 (probably nC31)) for grasses and herbs versus nC29 for deciduous trees, despite the large interplant variability within vegetation groups. In contrast with other Loess records in Europe, where Late Pleistocene environments are ranging from tundra-like (glacial) to deciduous forest habitats (interglacial), our results from two Armenian LPSs suggest a transition from humid-steppe biome or forest-steppe vegetation dominating during interglacial periods, to semi-desert shrubs species more adapted to the enhanced aridity during glacial periods.

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“…2008, 2015; Obreht et al . 2019). However, beside these extensive and continuous loess‐palaeosol sequences, there are also numerous loess areas in the southeastern, central and northeastern parts of the country (Marković et al .…”

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confidence: 99%

A post‐IR IRSL chronology and dust mass accumulation rates of the Nosak loess‐palaeosol sequence in northeastern Serbia

Períc

Marković

Sipos

et al. 2020

Boreas

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In the Middle Danube Basin, Quaternary deposits are widely distributed in the Vojvodina region where they cover about 95% of the area. Major research during the last two decades has been focused on loess deposits in the Vojvodina region. During this period, loess in the Vojvodina region has become one of the most important Pleistocene European continental climatic and environmental records. Here we present the dating results of 15 samples taken from the Nosak loess‐palaeosol sequence in northeastern Serbia in order to establish a chronology over the last three glacial–interglacial cycles. We use the pIRIR290 signal of the 4–11 μm polymineral grains. The calculated ages are within the error limits partially consistent with the proposed multi‐millennial chronostratigraphy for Serbian loess. The average mass accumulation rate for the last three glacial–interglacial cycles is 265 g m−2 a−1, which is in agreement with the values of most sites in the Carpathian Basin. Our results indicate a highly variable deposition rate of loess, especially during the MIS 3 and MIS 6 stages, which is contrary to most studies conducted in Serbia where linear sedimentation rates were assumed.

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A critical reevaluation of palaeoclimate proxy records from loess in the Carpathian Basin

Cited by 69 publications

References 239 publications

Testing polymineral post‐IR IRSLand quartzSAR‐OSLprotocols on Middle to Late Pleistocene loess at Batajnica, Serbia

Testing polymineral post‐IR IRSLand quartzSAR‐OSLprotocols on Middle to Late Pleistocene loess at Batajnica, Serbia

First Calibration and Application of Leaf Wax n-Alkane Biomarkers in Loess-Paleosol Sequences and Modern Plants and Soils in Armenia

A post‐IR IRSL chronology and dust mass accumulation rates of the Nosak loess‐palaeosol sequence in northeastern Serbia

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