Unmixed loess grain size populations along the northern Qilian Shan (China): Relationships between geomorphologic, sedimentologic and climatic controls

Nottebaum, Veit; Stauch, Georg; Hartmann, Kai; Zhang, Jingran; Lehmkuhl, Frank

doi:10.1016/j.quaint.2014.12.071

Cited by 75 publications

(32 citation statements)

References 113 publications

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“…As this may increase landscape stability on (loesscovered) alluvial fan terrace surfaces it may in contrast lead to higher reworking among fluvial and aeolian sediment storages in the low topography foreland. Increased lake levels in the nearby Badain Jaran Desert caused by an intensified mid-Holocene monsoon in the Qilian Shan Nottebaum et al, 2015) are further supportive to this geomorphological interpretation.…”

Section: Sedimentological Record In the Central Hexi Corridormentioning

confidence: 62%

“…Kocurek and Lancaster, 1999). Nottebaum et al (2015) suggested stabilized landscape conditions deduced from loess grain size composition during the mid-Holocene in the Qilian Shan. In contrast, no regional evidence of a relatively stabilized landscape is recognized among aeolian sand deposits during the mid-Holocene in the Hexi Corridor.…”

Section: Sedimentological Record In the Central Hexi Corridormentioning

confidence: 99%

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Late Quaternary aeolian sand deposition sustained by fluvial reworking and sediment supply in the Hexi Corridor — An example from northern Chinese drylands

et al. 2015

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Section: Sedimentological Record In the Central Hexi Corridormentioning

confidence: 62%

Section: Sedimentological Record In the Central Hexi Corridormentioning

confidence: 99%

Late Quaternary aeolian sand deposition sustained by fluvial reworking and sediment supply in the Hexi Corridor — An example from northern Chinese drylands

et al. 2015

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“…It lies towards the finer end of the range of 327 (Vandenberghe, 2013). Comparable loess of the same grain size has been identified 328 in loess from the northern Qilian Shan/Hexi Corridor (EM-2: 33 µm), which was also interpreted as 329 depositing from short-term suspension (Nottebaum et al, 2015). Loess of this grain size has been 330 energy than EM1, is transported further, is more widely distributed, and therefore comprises a higher 333 proportion of the distally deposited population in loess generally (Vandenberghe, 2013).…”

Section: Genetic Interpretations Of End Members In Loess Grain Size 282mentioning

confidence: 88%

Environmental dynamics since the last glacial in arid Central Asia: evidence from grain size distribution and magnetic properties of loess from the Ili Valley, western China

Song

Fitzsimmons

et al. 2017

Preprint

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24The extensive loess deposits of the Eurasian mid-latitudes provide important terrestrial records 25 of Quaternary climatic change. As yet, however, loess records in Central Asia are poorly understood. 26Here we investigate the grain size and magnetic characteristics of loess from the Nilka (NLK) 27 section in the Ili Basin of eastern Central Asia. Magnetic parameters indicate very weak pedogenesis 28 compared with loess from other regions in Eurasia. The higher χlf values occur in primary loess, 29 rather than in weak paleosols, and the variations in magnetic susceptibility (MS) value correlate 30closely with the proportions of the sand fraction. We attribute this result to high wind strength at the 31 time of loess deposition. To explore the dust transport patterns further, we identified three grain size 32 end members (EM1, mode size 47.5 µm; EM2, 33.6 µm; EM3, 18.9 µm ) which represent distinct 33 aerodynamic environments. EM1 and EM2 represent the grain-size fractions transported from 34 proximal sources in short-term, near-surface suspension during dust outbreaks. Hemisphere summer insolation clearly illustrate local insolation-based control on wind dynamics in 43 the region, and humdity can also influence grain size of loess over MIS3 in particular. Although, the 44 polar front dominated wind dynamics for loess deposition in the region, the Central Asian high 45 mountains obstructed its migration further south. Our results may also support the significance of 46 the mid-latitude westerlies in transmitting North Atlantic climate signals to East Asia. 47 48

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“…Examples include Weibull‐distribution fitting (Zobeck et al ., ; Sun et al ., , 2004) and lognormal‐distribution fitting (Qin et al ., ; Xiao et al ., , 2013). The EMMA method used in this study has yielded advances in process‐related interpretations of grain size data (Weltje, ; Weltje and Prins, ; Dietze et al ., , , ; Nottebaum et al ., ; Langford et al ., ; Collins et al ., ) and is demonstrated to be well suited for unmixing subpopulations of multimodal GSDs that may not be readily visible in GSDs. Fundamental details on the EMMA method are given in Weltje () and Weltje and Prins (, ) and have been developed further by Dietze et al .…”

Section: Methodsmentioning

confidence: 99%

“…traction, saltation and suspension) across all sampled geomorphological and sedimentological conditions. Thus, the unmixed EM proportions will shift according to the proportional change that is contributing to transport processes across the study area (Nottebaum et al ., ; Langford et al ., ). This provides more geologically meaningful results compared to typical interpretations of variation from discrete sites using individual samples.…”

Section: Methodsmentioning

confidence: 99%

Characterizing formation processes of Rimrock Lake, a Late Pleistocene–Holocene playa, Harney Basin, south‐eastern Oregon, USA, using an end‐member mixing analysis

Collins

Gill

Langford

2018

J Quaternary Science

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Playas collect sediments from different transported processes, producing grain-size distributions (GSDs) reflecting changes in environment. End-member mixing analysis (EMMA) was used to derive end-members (EMs) from 256 sediment samples from Rimrock Lake (Harney Basin, Oregon, USA) and a nearby relict channel. EMMA identified six EMs representing deposition in fluvial, lacustrine, littoral and colluvial environments. Stratigraphy was time-correlated using nine radiocarbon dates. Results show that Rimrock Lake existed by $ 18 535 cal a BP. A relict playa surface also was exposed along its margin and indicates lake contraction $ 6190-5990 cal a BP. In the relict channel, a dominant eolian environment is identified at $ 8000 cal a BP. These results represent a shift to a more arid environment in the Harney Basin beginning around the mid-Holocene and are in general agreement with other studies reported in the Great Basin. This study demonstrates the application of EMMA for analyzing complex playa sediments and for linking environmental response across separate but related geomorphic environments. Our results provide a paleoenvironmental record along Harney Basin's western margin between $ 18 500 and 6000 cal a BP and demonstrate the use of small playas in the basin as environmental archives. Figure 2. (A) Modified Google Earth image of Rimrock Lake with geomorphic features, core locations and Trench 1 identified. (B) Modified Google Earth image of Rimrock Draw Rockshelter with excavation units, Trench 2 and channel boundary identified (dashed line).

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Unmixed loess grain size populations along the northern Qilian Shan (China): Relationships between geomorphologic, sedimentologic and climatic controls

Cited by 75 publications

References 113 publications

Late Quaternary aeolian sand deposition sustained by fluvial reworking and sediment supply in the Hexi Corridor — An example from northern Chinese drylands

Late Quaternary aeolian sand deposition sustained by fluvial reworking and sediment supply in the Hexi Corridor — An example from northern Chinese drylands

Environmental dynamics since the last glacial in arid Central Asia: evidence from grain size distribution and magnetic properties of loess from the Ili Valley, western China

Characterizing formation processes of Rimrock Lake, a Late Pleistocene–Holocene playa, Harney Basin, south‐eastern Oregon, USA, using an end‐member mixing analysis

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