Dynamique de la sédimentation à l'Holocène moyen et final et ses implications paléoclimatiques dans le bassin du lac Ulaan, sud de la Mongolie

Orkhonselenge, Alexander; Komatsu, G.; Uuganzaya, Munkhjargal

doi:10.4000/geomorphologie.12219

Cited by 14 publications

(17 citation statements)

References 44 publications

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“…The late Holocene climate in southern Mongolia at 1.5 cal. ka BP is more comparable with the results from northern China, while the paleoclimate pattern in northern Mongolia is much closer to the records from southern Siberia(Orkhonselenge et al 2018b). In terms of the Holocene climate change in Mongolia, the climate in northern Mongolia has been remarkably in agreement with the paleoclimate changes in the East Asian winter monsoon (EAWM) and the mid-latitude westerlies dominated regions, whereas the climate in southern Mongolia has been coincident with the East Asian summer monsoon (EASM) and the westerlies dominated areas.…”

supporting

confidence: 83%

“…3b, the rst two sites LU18-1 and LU18-2, are located in the lake's center, whereas the last two sites LU18-3 and LU18-4, are located toward the margins as in the case of the sites UN15-1 and UN15-2 ( Fig. 3) for the previously studied by Orkhonselenge et al (2018b). However, at present, the sites LU18-1 to LU18-4 in the eastern part of the lake (Fig.…”

Section: Field Samplingmentioning

confidence: 63%

“…Bottom sediments of Lake Ulaan consisted of deposits in the Neogene when water level and area were almost 100 m higher and several ten times larger in size than the present (Tserensodnom, 1971). Lake beaches are at plain and swampy (Orkhonselenge et al 2018b), and there are sand dune elds in the northwest and north (Tsegmid 1969). Dashzeveg et al (2005) noted the Cretaceous dune eld in the Lake Ulaan basin based on cross-bedded intervals, occasionally exhibiting windripple cross lamination in the Bayan Zag and Tugrugiin Shiree stratigraphic columns.…”

Section: Geomorphological Settingmentioning

confidence: 99%

“…Fig. 7b) to 60.24-62.64 at the sites UN15-1 and UN15-2 in the western part of the lake(Orkhonselenge et al 2018b). …”

mentioning

confidence: 94%

“…The dry climate since 3.2-2.7 cal. ka BP in the Lake Ulaan basin may have induced the slow sedimentation rate of 1.6-1.8 cm/ka in the western part of Lake Ulaan(Orkhonselenge et al 2018b) and strengthened the recent shrinkage of the shallow lake…”

mentioning

confidence: 99%

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Late Holocene Sedimentation Dynamics in the Lake Ulaan Basin, Southern Mongolia: A History of a Playa Lake 

Orkhonselenge

Uuganzaya

Davaagatan

2021

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Sedimentation dynamics in the Lake Ulaan basin located in the northern margin of the Govi region, southern Mongolia show high sedimentation rates of 11.8–22.7 cm/ka in the eastern part of the basin and low rates of 3.3–5.8 cm/ka in the western part during the late Holocene. The eastern and western parts of the lake have been strongly influenced by fluvial and aeolian activities since the arid late Holocene. However, fluvial sediment input was more significantly recorded in the eastern part. Aeolian deflation has been prevailing throughout the lake bank recently. Lake Ulaan reached its maximum extent before the early Holocene (Sternberg and Paillou, 2015; Holguin and Sternberg, 2016) with a water depth of ~43 m (Lehmkuhl et al., 2018a). After the early Holocene, Lake Ulaan started to decrease its area, and the drop of the lake level intensified since the middle Holocene. In the late Holocene, the лйоупы western and eastern parts were initially exposed to wind deflation at 2.7–3.2 cal. ka BP and the aerial exposition continued at 0.6–1.3 cal. ka BP. In the Anthropocene, Lake Ulaan has rapidly shifted into a playa lake condition during the last five to six decades, and it has become an open-source area of dust generation blown out by the westerly winds.

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supporting

confidence: 83%

Section: Field Samplingmentioning

confidence: 63%