<abstract xmlns="http://www.w3.org/1999/xhtml">

The loess sediments widely distributed in the Central Shandong Mountains are sensitive records of East Asian monsoon changes for situating in a key region connected to the Eurasian Plate and the Pacific Ocean. However, the detailed processes of palaeoclimatic changes are poorly understood for the lack of high-resolution chronology. In this study, the chronology of Heishan loess palaeosol sequence in the Central Shandong Mountains is investigated using quartz SAR OSL and K-feldspar post-IR infrared (IR) stimulated luminescence (post-IR IRSL) dating method. The quartz is sensitive, fast component dominated and saturate at ∼150 Gy (∼50 ka). The measured K-feldspar pIRIR290 De showed no dependency on the first IR stimulation temperature between 50°C and 260°C. The K-feldspar pIRIR290 ages are consistent with the stratigraphy up to ∼75 ka. In establishing the chronological sequence for the study section, quartz OSL ages &lt;50 ka and the K-feldspar pIRIR290 ages >50 ka were selected. Derived sedimentation rates show two relatively rapid stages of ∼32.0 ± 5.5 cm/ka for the palaeosol (∼11–8 ka) and ∼54.8 ± 1.1 cm/ka for the loess (∼34–30 ka). An erosional hiatus of loess between ∼30 ka and ∼17 ka is identified. We conclude that the pIRIR290 of loess sediments is applicable for samples during ∼8–75 ka.
</abstract>

The loess sediments widely distributed in the Central Shandong Mountains are sensitive records of East Asian monsoon changes for situating in a key region connected to the Eurasian Plate and the Pacific Ocean. However, the detailed processes of palaeoclimatic changes are poorly understood for the lack of high-resolution chronology. In this study, the chronology of Heishan loess palaeosol sequence in the Central Shandong Mountains is investigated using quartz SAR OSL and K-feldspar post-IR infrared (IR) stimulated luminescence (post-IR IRSL) dating method. The quartz is sensitive, fast component dominated and saturate at ∼150 Gy (∼50 ka). The measured K-feldspar pIRIR290 De showed no dependency on the first IR stimulation temperature between 50°C and 260°C. The K-feldspar pIRIR290 ages are consistent with the stratigraphy up to ∼75 ka. In establishing the chronological sequence for the study section, quartz OSL ages <50 ka and the K-feldspar pIRIR290 ages >50 ka were selected. Derived sedimentation rates show two relatively rapid stages of ∼32.0 ± 5.5 cm/ka for the palaeosol (∼11–8 ka) and ∼54.8 ± 1.1 cm/ka for the loess (∼34–30 ka). An erosional hiatus of loess between ∼30 ka and ∼17 ka is identified. We conclude that the pIRIR290 of loess sediments is applicable for samples during ∼8–75 ka.

High Resolution Quartz OSL and K-feldspar post-IR IRSL Dating of Loess in the Central Shandong Mountains (Eastern China)

Key Laboratory of Tourism and Resources Environment in Universities of Shandong

Key Laboratory of Cenozoic Geology and Environment

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The loess sediments widely distributed in the Central Shandong Mountains are sensitive records of East Asian monsoon changes for situating in a key region connected to the Eurasian Plate and the Pacific Ocean. However, the detailed processes of palaeoclimatic changes are poorly understood for the lack of high-resolution chronology. In this study, the chronology of Heishan loess palaeosol sequence in the Central Shandong Mountains is investigated using quartz SAR OSL and K-feldspar post-IR infrared (IR) stimulated luminescence (post-IR IRSL) dating method. The quartz is sensitive, fast component dominated and saturate at ∼150 Gy (∼50 ka). The measured K-feldspar pIRIR290 De showed no dependency on the first IR stimulation temperature between 50°C and 260°C. The K-feldspar pIRIR290 ages are consistent with the stratigraphy up to ∼75 ka. In establishing the chronological sequence for the study section, quartz OSL ages 50 ka were selected. Derived sedimentation rates show two relatively rapid stages of ∼32.0 ± 5.5 cm/ka for the palaeosol (∼11–8 ka) and ∼54.8 ± 1.1 cm/ka for the loess (∼34–30 ka). An erosional hiatus of loess between ∼30 ka and ∼17 ka is identified. We conclude that the pIRIR290 of loess sediments is applicable for samples during ∼8–75 ka.

The loess sediments widely distributed in the Central Shandong Mountains are sensitive records of East Asian monsoon changes for situating in a key region...

High Resolution Quartz OSL and K-feldspar post-IR IRSL Dating of Loess in the Central Shandong Mountains (Eastern China)

Publié en ligne: 31 déc. 2021

Pages: 232 - 241

Reçu: 15 janv. 2019

Accepté: 12 juil. 2019

DOI: https://doi.org/10.1515/geochr-2015-0113

Mots clés
quartz SAR OSL, K-feldspar post-IR IRSL, last glacial period, hiatus, loess-palaeosol sequence

© 2019 Qiuyue Zhao et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

High Resolution Quartz OSL and K-feldspar post-IR IRSL Dating of Loess in the Central Shandong Mountains (Eastern China)

Publié en ligne: 31 déc. 2021

Pages: 232 - 241

Reçu: 15 janv. 2019

Accepté: 12 juil. 2019

DOI: https://doi.org/10.1515/geochr-2015-0113

Mots clésquartz SAR OSL, K-feldspar post-IR IRSL, last glacial period, hiatus, loess-palaeosol sequence

© 2019 Qiuyue Zhao et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
quartz SAR OSL, K-feldspar post-IR IRSL, last glacial period, hiatus, loess-palaeosol sequence