Approaches and challenges to the study of loess—Introduction to the LoessFest Special Issue

Schaetzl, Randall J.; Bettis, E. Arthur; Crouvi, Onn; Fitzsimmons, Kathryn E.; Grimley, David A.; Hambach, Ulrich; Lehmkuhl, Frank; Marković, Slobodan B.; Mason, Joseph A.; Owczarek, Piotr; Roberts, Helen M.; Rousseau, Denis‐Didier; Stevens, Thomas; Vandenberghe, Jef; Zárate, Marcelo; Vereș, Daniel; Yang, Shiling; Zech, Michael; Conroy, Jessica L.; Dave, Aditi Krishna; Faust, Dominik; Hao, Qingzhen; Obreht, Igor; Prud'homme, Charlotte; Smalley, Ian; Tripaldi, Alfonsina; Zeeden, Christian; Zech, Roland

doi:10.1017/qua.2018.15

Cited by 104 publications

(53 citation statements)

References 534 publications

(891 reference statements)

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“…at the desert marginal CLP site at Jingbian showed substantial gaps in the preserved sediment record (Stevens et al, 2018), supporting this eolian cannibalism hypothesis, full testing of this theory requires detailed understanding of patterns in loess deposition and preservation across the whole CLP. Better understanding of patterns in loess sedimentation processes over a large geographical area is required to determine the degree of integrity of the loess record and the extent to which variations in millennial-scale climate and dust activity are recorded (Schaetzl et al, 2018). To address these issues, we investigated the variability and regional comparability of loess sedimentation on the CLP during the past 20 k.y., focusing on subglacial-interglacial time scales.…”

Section: Introductionmentioning

confidence: 99%

Seesaw pattern in dust accumulation on the Chinese Loess Plateau forced by late glacial shifts in the East Asian monsoon

Stevens

et al. 2018

Geology

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Recent chronological studies have revealed significant site-specific variations in loess sedimentation, which challenge the use of loess deposits as continuous, easily analyzable paleoclimate and dust records. However, the regional comparability of loess sedimentation at subglacial-interglacial time scales has not yet been systematically tested. This study focused on the spatial and temporal variability of loess sedimentation on the Chinese Loess Plateau (CLP) during the last 20 thousand years and found a clear seesaw pattern across the CLP, indicated by rapid dust accumulation at the desert margin and reduced accumulation/less preservation on the main part of the CLP after ca. 15 ka. This spatial inhomogeneity of loess sedimentation at millennial time scales is controlled by various dust transportation, trapping, and postdepositional processes in different geographic settings, which are ultimately attributed to a combined effect of a weakened winter monsoon and enhanced summer monsoon after the termination of Heinrich event 1.

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Section: Introductionmentioning

confidence: 99%

Seesaw pattern in dust accumulation on the Chinese Loess Plateau forced by late glacial shifts in the East Asian monsoon

Stevens

et al. 2018

Geology

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“…Magnetic susceptibility, a proxy for pedogenetic intensity in loess (Schaetzl et al . ; Zeeden et al . 2018b), allows the tentative alignment of loess records onto the benthic isotope stack (Lisiecki & Raymo ) or the insolation curve (Laskar et al .…”

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confidence: 99%

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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“…Studying the geochemistry of loess sediment is a powerful tool to understand its origins, transportation, and post-depositional modification. More importantly, geochemical studies may provide insights into Quaternary climate change (e.g., Schaetzl et al, 2018;Han et al, 2019). A fair amount of geochemical data has been generated on the loess-palaeosol sequences of the Kashmir Valley (Lodha et al, 1987(Lodha et al, , 1988Ahmad and Chandra, 2013).…”

Section: Geochemistry Of Kashmir Loessmentioning

confidence: 99%

Loess-Palaeosol Sequences in the Kashmir Valley, NW Himalayas: A Review

Dar

Zeeden

2020

Front. Earth Sci.

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Loess deposits and intercalated palaeosols are widespread in the Quaternary record, and these have been extensively used to gain insights into continental paleoclimatic and paleo-environmental conditions and changes. Especially over Eurasia, loess geoarchives play an important role for our understanding of past changes. Loess covers almost 500 km 2 of the Kashmir Valley in northwestern India, it occurs dominantly in plateau positions, but also on terraces and sometimes forms slope deposits with thicknesses ranging from several to more than 20 m. For the time being, however, the timing of the initiation of the loess accumulation, the provenance, the grain size composition and also the paleo-environment have not been studied systematically and yet only little quantitative data is available. Yet it is clear that deposition rates are at least comparable to European loess, and that the presence of multiple palaeosols intercalated in the loess can provide valuable information on the history of the region. The limited available data hinders regional and continental correlation, and tapping its value as archive of past environmental changes in this sensitive region with influence from Westerlies and the Indian Monsoon. However, several characteristic palaeosol patterns can be traced throughout the Kashmir valley, which provide stratigraphic information. Several studies investigate physical and chemical properties of the loess-paleosol sequences and conclude to its aeolian origin and recording of past climates. The intensity of soil formation phases is traced through various proxies in low resolution and yet without conclusive age control. Here we review the exiting literature, available data, and interpretations from loess-palaeosol sequences in the Kashmir Valley. These are placed in the context of our own observations and loess from the Indian subcontinent.

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Approaches and challenges to the study of loess—Introduction to the LoessFest Special Issue

Cited by 104 publications

References 534 publications

Seesaw pattern in dust accumulation on the Chinese Loess Plateau forced by late glacial shifts in the East Asian monsoon

Seesaw pattern in dust accumulation on the Chinese Loess Plateau forced by late glacial shifts in the East Asian monsoon

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

Loess-Palaeosol Sequences in the Kashmir Valley, NW Himalayas: A Review

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