Mineralogy and grain morphology of the aeolian dune sand of Toshka area, southeastern Western Desert, Egypt

Refaat, Ahmed; Hamdan, Mohamed A.

doi:10.1016/j.aeolia.2015.04.006

Cited by 24 publications

(10 citation statements)

References 43 publications

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“…Lower quartz and higher aragonite contents indicate that YD04 and YD05 sands have not been exposed to significant chemical weathering from soil forming processes, and that they are mineralogically very immature (Lancaster et al, ). In other words, they experienced a short transport path and residence time in the aeolian environment (Refaat & Hamdan, ). Therefore, the YD04 and YD05 yardang corridor sands are not the source for the linear dunes on the northern margin of Qarhan Salt Lake.…”

Section: Discussionmentioning

confidence: 99%

Source of aeolian dune sands on the northern margin of Qarhan Salt Lake, Qaidam Basin, NW China

Zhou

Yan

et al. 2019

Geological Journal

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The aeolian landforms in the Qaidam Basin have drawn increasing attention from geomorphologists for their morphological and formation mechanisms' similarities with their counterparts on Mars and Titan. Using grain-size and mineral composition data, this study investigated the source of aeolian dune sands found on the northern margin of Qarhan Salt Lake in the south central part of the Qaidam Basin. Results indicate that linear dune sands and gobi surface sediments are mainly composed of fine and very fine sands, while the yardang corridor sands are much coarser, with medium and fine sands in predominance. The curves of the linear dune sands show a standard normal distribution pattern. This is also the case for the gobi surface sediments and yardang corridor sands located away from linear dunes. However, the curves for these two sediment types show much wider kurtoses. The distribution curves for the yardang corridor sands located near the linear dunes are different from the above-mentioned sediments, which explicitly display bimodal distributions. More mineral types were detected in the yardang corridor sands and gobi surface sediments than in dune sands.But the major mineral compositions of the three kinds of sediments are similar. Contents of typical very stable and stable heavy minerals differ little among the three sediments, while the contents of some heavy minerals with poor stability differ greatly.The relative proportions of quartz, plagioclase, and orthoclase in all three kinds of sediments demonstrate that they all likely originated from the granite and granodiorite rocks of the Qilian Mountain ranges. Therefore, gobi surface sediments and yardang corridor sands near the study linear dune field could be the source of dune sands. Further investigations are needed to determine whether the yardang corridor sands far away from the study linear dune field feed dunes in the Sebei area.

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Section: Discussionmentioning

confidence: 99%

Source of aeolian dune sands on the northern margin of Qarhan Salt Lake, Qaidam Basin, NW China

Zhou

Yan

et al. 2019

Geological Journal

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“…These results are in agreement with the findings of Hamdan et al . 67 and Refaat and Hamdan 68 on the aeolian dune sand of the Toshka area, Southeastern Western Desert, Egypt, and Lancaster et al . 69 on the Owens lake dune fields, and Garzanti et al ., 2013 69 in the Arab states of the Persian Gulf.…”

Section: Discussionmentioning

confidence: 99%

Sediment Source Fingerprinting of the Lake Urmia Sand Dunes

Ahmady‐Birgani

Agahi

Ahmadi

et al. 2018

Sci Rep

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Aeolian sand dunes are continuously being discovered in inner dry lands and coastal areas, most of which have been formed over the Last Glacial Maximum. Presently, due to some natural and anthropogenic implications on earth, newly-born sand dunes are quickly emerging. Lake Urmia, the world’s second largest permanent hypersaline lake, has started shrinking, vast lands comprising sand dunes over the western shore of the lake have appeared and one question has been playing on the minds of nearby dwellers: where are these sand dunes coming from, What there was not 15 years ago!! In the present study, the determination of the source of the Lake Urmia sand dunes in terms of the quantifying relative contribution of each upstream geomorphological/lithological unit has been performed using geochemical fingerprinting techniques. The findings demonstrate that the alluvial and the fluvial sediments of the western upstream catchment have been transported by water erosion and they accumulated in the lower reaches of the Kahriz River. Wind erosion, as a secondary agent, have carried the aeolian sand-sized sediments to the sand dune area. Hence, the Lake Urmia sand dunes have been originating from simultaneous and joint actions of alluvial, fluvial and aeolian processes.

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“…Dish-shaped and disciform pits with both regular and arcuate edges formed in highly rounded particles indicate high-intensity wind. These pits range 10-30 lm in depth in particles 100 lm in diameter (Mongelli et al 2006;Abdullah and Eswaran 2014;Refaat and Hamdan 2015). Conchoidal fracture of quartz grains is interpreted as evidence of glacial deposition (Mahaney et al 2001;Cowan et al 2008;Deane 2010).…”

Section: Morphology and Textural Characteristics Of Quartz Sandsmentioning

confidence: 99%

Discovery and significance of Quaternary aqueously deposited aeolian sandstones in the Sanhu area, Qaidam Basin, China

Mao

Guo

2018

Pet. Sci.

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Influenced by neo-tectonic movement, the Sanhu area of China's Qaidam Basin formed in the Quaternary in response to migration of its depocentre. A study of core material from the Qijia 1 Well reveals novel Quaternary aqueously deposited aeolian sandstones in the Qigequan Formation of the Sanhu area. Here we report the sedimentary petrology and geochemistry data of these deposits that constrain their depositional history. Evidence for aeolian influence during deposition includes: sorting and roundness, pure quartz sand with single mode grain size distribution and few suspension materials, very fine sand grain size distribution indicating sorting by saltation and suspension transport, dish-shaped and crescentshaped pits in grain surfaces indicating aeolian transport and chemical composition similar to that observed in active or recent dune deposits, namely enrichment in SiO 2 , Na 2 O, and MgO relative to the sand dam sediment in the lakeshore. Identification of these aqueously deposited aeolian sandstones expands the range of sedimentary deposit types found in the Sanhu area and improves understanding of its paleoclimatic history.

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Mineralogy and grain morphology of the aeolian dune sand of Toshka area, southeastern Western Desert, Egypt

Cited by 24 publications

References 43 publications

Source of aeolian dune sands on the northern margin of Qarhan Salt Lake, Qaidam Basin, NW China

Source of aeolian dune sands on the northern margin of Qarhan Salt Lake, Qaidam Basin, NW China

Sediment Source Fingerprinting of the Lake Urmia Sand Dunes

Discovery and significance of Quaternary aqueously deposited aeolian sandstones in the Sanhu area, Qaidam Basin, China

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