Pseudo-feathery dunes in the Kumtagh desert reclassified as linear dunes and zibars

Wang, Zhenting; Sun, Qingfeng; Ren, Xuemei; Wang, Tao; Chen, Fahu

doi:10.1016/j.aeolia.2009.04.001

Cited by 14 publications

(11 citation statements)

References 3 publications

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“…Previous research and the present findings indicate that the zibar sediments are characterized by a bimodal distribution, and that the two peaks of grain size differ considerably (Warren, 1971(Warren, , 1972Lancaster, 1982;Nielson and Kocurek, 1986;Wang et al, 2009). The mode of the distribution for the coarser particles is either very coarse sand or gravel, whereas the mode for the finer particles ranges from Table 2 Comparison of the drift potentials for the sand dunes and the oblique zibars in the northeastern Kumtagh Desert.…”

Section: Sedimentary Processes In Zibarssupporting

confidence: 47%

“…Nielson and Kocurek (1986) noted that zibars are migrating features that are oriented transverse to or oblique to the dominant sand-transporting direction. It is noteworthy that the morphological and sedimentary characteristics that have been described for zibars mainly focused on transverse zibars within the interdune corridors between linear dunes, and these bedforms generally have discernible fluctuations in height and distinct windward and leeward deposits (Warren, 1971(Warren, , 1972Nielson and Kocurek, 1986;Wang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Morphological and sedimentary features of oblique zibars in the Kumtagh Desert of Northwestern China

et al. 2015

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Section: Sedimentary Processes In Zibarssupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Morphological and sedimentary features of oblique zibars in the Kumtagh Desert of Northwestern China

et al. 2015

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“…Comprehensive scientific expeditions into the Desert were not conducted until 2004 because of its harsh natural environment (E et al ., ; Wang et al ., ). There is currently ongoing debate amongst Chinese desert geomorphologists as to the definition and classification of the Desert's feather‐like dune fields (Dong et al ., ; Dong, ; Wang et al ., ; Qu et al ., ; Qian et al ., ).…”

Section: Regional Settingmentioning

confidence: 98%

“…Comprehensive scientific expeditions into the Desert were not conducted until 2004 because of its harsh natural environment (E et al, 2006;Wang et al, 2009). There is currently ongoing debate amongst Chinese desert geomorphologists as to the definition and classification of the Desert's feather-like dune fields (Dong et al, 2008;Dong, 2009;Wang et al, 2009;Qu et al, 2011;Qian et al, 2015). Previous geomorphological studies in the Kumtagh Desert by Chinese scientists during the last decade have been selectively translated and reviewed by Dong and Lv (2014).…”

Section: Regional Settingmentioning

confidence: 99%

Inverted relief landforms in the Kumtagh Desert of northwestern China: a mechanism to estimate wind erosion rates

Wang

Lai

2015

Geol. J.

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Although commonly found in deserts, our knowledge about inverted relief landforms is very limited. The so‐called ‘Gravel Body’ in the northern Kumtagh Desert is an example of an inverted relief landform created by the exhumation of a former fluvial gravel channel. The common occurrence of these landforms indicates that fluvial processes played an important role in shaping the Kumtagh Desert in the past 151 ka. A physical model is presented to reconstruct the palaeohydrology of these fluvial channels in terms of several measurable parameters including terrain slope, boulder size, and channel width. Combining the calculated palaeoflood depth, the maximal depth of channel bed eroded by wind, and the current height of inverted channels with the age of the aeolian sediments covered by gravels, the local wind erosion rate is estimated to be 0.21–0.28 mm/year. It is shown that wind erosion occurring in the Kumtagh Desert is no more severe than in adjacent regions. Since the modern Martian environment is very similar to that of hyperarid deserts on Earth, and Mars was once subjected to fluvial processes, this study will be helpful for understanding the origin of analogous Martian surface landforms and their causative processes. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Zibars are bedforms considered dunes which do not have time to fully develop (proto-dunes), their internal architecture is composed by low-angle or tabular sets separated by truncation surface Bristow et al 2010). This eolian sand sheet was characterized by abundance of zibar dunes, as well as many present-day eolian systems Wang et al 2009). Nielson and Kocurek (1986) analyzed zibars deposits in a sand sheet area from Entrada Sandstone Formation and observed that slipfaced dunes deposits had to fine-to medium-grained sand (0.1 -0.3 mm) and the zibars fine-to coarse -grained sand (0.1 -1.0 mm) and claimed that this grain-size may be an important factor to preventing the slipfaced dunes formation.…”

Section: Paleoenvironment Analysismentioning

confidence: 99%

Unusual thick eolian sand sheet sedimentary succession: Paleoproterozoic Bandeirinha Formation, Minas Gerais

Simplício

Basílici

2015

Braz. J. Geol.

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Some present-day eolian sand sheets have small and width dunes, called zibars, as common type of depositional morphology. Their formation is related to different stabilizing factors, which reduce the availability of clastic materials for eolian processes. In fact, zibars are dunes which do not have time to develop a larger dune with slipface (proto-dune). Dunes in sands sheet areas generally are constructed by wind ripple laminations and commonly generate sedimentary succession less than 20 m thick, which are the consequence of low sand supply. This study deals with an uncommon eolian sand sheet sedimentary succession more than 50 m thick, Proterozoic in age, known as Bandeirinha Formation. This paper tries to explain the anomalous thick of this sand sheet sedimentary succession. High thickness was probably the result of a high input of sand material, combine with low availability of sand, thus allowing the only construction of proto-dunes (zibars). Early cementation, due to near-surface evaporation of saline water, has been proposed as main factor that reduced the sand availability into this eolian system. Finally, the subsidence processes related to the first stage of rift Espinhaço Basin must have generated the accommodation space to preserve the sand sheet succession. KEYWORDS:Eolian sand sheet; zibar; ephemeral channel rivers; Bandeirinha Formation; Paleoproterozoic. RESUMO: Em alguns lençóis de areia eólica atuais existem dunas pequenas e largas, chamadas zibars, como tipo comum de morfologia deposicional. Sua formação é relacionada a diferentes fatores de estabilização, os quais reduzem a disponibilidade de materiais clásticos para os processos eólicos. De fato, os zibars são dunas que não tiveram tempo para se desenvolver como grandes dunas (protodunas). As dunas dos lençóis de areia (zibars) geralmente são construídas por laminações de marcas onduladas de vento e comumente geram sucessões com menos de 20 m de espessura

show abstract

Pseudo-feathery dunes in the Kumtagh desert reclassified as linear dunes and zibars

Cited by 14 publications

References 3 publications

Morphological and sedimentary features of oblique zibars in the Kumtagh Desert of Northwestern China

Morphological and sedimentary features of oblique zibars in the Kumtagh Desert of Northwestern China

Inverted relief landforms in the Kumtagh Desert of northwestern China: a mechanism to estimate wind erosion rates

Unusual thick eolian sand sheet sedimentary succession: Paleoproterozoic Bandeirinha Formation, Minas Gerais

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