Testing post-IR-IRSL dating on Armenian loess-palaeosol sections against independent age control

Lomax, Johanna; Wolf, Daniel; Meliksetian, Khachatur; Wolpert, Tilmann; Sahakyan, Lilit; Hovakimyan, Hayk; Faust, Dominik; Fuchs, Markus

doi:10.1016/j.quageo.2022.101265

Cited by 4 publications

(4 citation statements)

References 52 publications

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“…S5 a,b. The applicability of the protocol was confirmed by dose recovery tests and comparison with quartz OSL ages for the younger samples (< 60 ka) 39 , 109 . For older samples, especially within the MIS6 loess layer, ages were underestimated, probably due to fading.…”

Section: Methodsmentioning

confidence: 84%

“…The upper palaeosoil (P-1/S1) indicates a Chernozem-like soil type with pale black colors, a crumbly structure, and plenty of krotovinas. Based on luminescence dating in terms of fading corrected post-IR-IRSL (p-IRIR) ages 39 , we assign pedocomplex P-1 to MIS-5. The lower palaeosoil (P-1/S3) relates to the Eemian interglacial period (MIS-5e) as evidenced by pedogenic features and p-IRIR ages.…”

Section: Resultsmentioning

confidence: 99%

“…For older samples, especially within the MIS6 loess layer, ages were underestimated, probably due to fading. This was made evident by comparison with a tephra layer located in the lower part of the MIS6 loess, which was dated to 194.0 ± 8.5 ka 39 , and by laboratory fading tests 39 , 109 Since laboratory fading rates often appear overestimated, measured fading rates were subtracted by a fixed rate of 1%, in order to represent the laboratory artefact responsible for the overestimation. This reduced fading rate was applied with the correction approach of 110 .…”

Section: Methodsmentioning

confidence: 99%

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Last glacial loess dynamics in the Southern Caucasus (NE-Armenia) and the phenomenon of missing loess deposition during MIS-2

Wolf

Lomax

Sahakyan

et al. 2022

Sci Rep

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The Marine Isotope Stage (MIS) 2 is considered the coldest, driest and stormiest period during the last Glacial-Interglacial cycle in large parts of Eurasia. This resulted from strongly decreased northern hemisphere temperature and related maximum extension of northern ice sheets that strongly reinforced large-scale circulation modes such as westerlies and East Asian Winter Monsoon driven by the Siberian High. Normally, this intensified circulation is reflected by maximum loess deposition in numerous loess regions spanning Europe and Asia. However, here we present a new loess record from the Caucasus region in NE-Armenia providing evidence in support of heavily reduced or even lacking loess formation during the MIS-2. Owing to implementations of comprehensible luminescence dating work and a provenance survey using rock magnetic and geochemical data, we are able to define distinct loess formation phases and to retrace sediment transport pathways. By comparing our results to other Eurasian palaeo-records, we unveil general atmospheric circulation modes that are most likely responsible for loess formation in the Southern Caucasus. Moreover, we try to test different scenarios to explain lacking loess formation during MIS-2. In line with other archive information, we suggest that loess formation was hampered by higher regional moisture conditions caused by a southward-shift of westerlies and renewed moisture absorption over the Black Sea. Our results show that modifications of MIS-2 circulation modes induced a very heterogeneous moisture distribution, particularly in the lower mid-latitudes of Eurasia producing a juxtaposition of very dry (morphodynamically active) and moderately dry (morphodynamically stable) areas.

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Section: Methodsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Last glacial loess dynamics in the Southern Caucasus (NE-Armenia) and the phenomenon of missing loess deposition during MIS-2

Wolf

Lomax

Sahakyan

et al. 2022

Sci Rep

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“…It should be noted that a small laboratory dose of ~70 Gy is used for all samples for g-value measurements. Previous studies reveal that the measured g-values increase with larger laboratory doses used for the g-value measurements (Huntley and Lian, 2006;Li and Li, 2008;Lomax et al, 2022). As the model of Kars et al (2008) has already incorporated the fading rate change with increasing irradiation, a small laboratory dose should be used to measure the initial fading rate.…”

Section: The Pirir225 and Pulsed Pirir150 Protocolmentioning

confidence: 99%

High-resolution luminescence-dated sediment record for the last two glacial-interglacial cycles from Rodderberg, Germany

Zhang,

Zolitschka,

Hogrefe

et al. 2023

Preprint

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The Rodderberg Volcanic Complex (RVC) is well-known for the long and probably continuous climate record archived in its crater basin, which lasts for several glacial-interglacial cycles. However, a detailed chronological framework is still lacking. Here, we perform high-resolution luminescence dating on a 72.8 m-long sediment core with the optically stimulated luminescence (OSL) signal from fine-grained (4–11 µm) quartz and three kinds of post-infrared infrared (pIRIR) stimulated luminescence signals from fine-grained polymineral fractions. Quartz OSL ages align well with pIRIR ages for the last 50 ka, but they underestimate in relation to pIRIR ages for ages beyond 50 ka. The three pIRIR signals, including the pIRIR signal at 225 °C (pIRIR225), the pulsed pIRIR signal at 150 °C (pulsed pIRIR150) and the multi-elevated-temperature pIRIR at 250 °C (MET-pIRIR250), yield consistent ages up to ca. 250 ka at a sediment depth of 37.5 m. Below that depth, dating limits of the protocols are exceeded. Nevertheless, our results indicate that sediments below 37.5 m predate Marine Isotope Stage (MIS) 7. Altogether, obtained ages reveal continuous dust accumulation during MIS 7 and MIS 6. One erosional event happened at the end of the Eemian (MIS 5e), which eroded the Eemian soil. The sedimentation rate during the Weichselian glacial period is tenfold lower compared to the sedimentation rate observed during MIS 7–6. This low sedimentation rate likely arises from the cessation of slope-wash effects and the occurrence of various erosional events alternating with dust deposition. A notably high sedimentation rate is observed at the transition from MIS 6 to Eemian, marked by the deposition of a 6 m-thick loess layer between 132 and 129 ka. This high sedimentation rate could be attributed to intensified slope-wash and solifluction processes resulting from the thawing of permafrost. Alternatively, it might be a signature of an abrupt cold pulse such as Heinrich event 11.

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High-resolution luminescence-dated sediment record for the last two glacial-interglacial cycles from Rodderberg, Germany

Zhang,

Zolitschka,

Hogrefe

et al. 2024

Quaternary Geochronology

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Testing post-IR-IRSL dating on Armenian loess-palaeosol sections against independent age control

Cited by 4 publications

References 52 publications

Last glacial loess dynamics in the Southern Caucasus (NE-Armenia) and the phenomenon of missing loess deposition during MIS-2

Last glacial loess dynamics in the Southern Caucasus (NE-Armenia) and the phenomenon of missing loess deposition during MIS-2

High-resolution luminescence-dated sediment record for the last two glacial-interglacial cycles from Rodderberg, Germany

High-resolution luminescence-dated sediment record for the last two glacial-interglacial cycles from Rodderberg, Germany

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