Sand-grain micromorphology used as a sediment-source indicator for Kharga Depression dunes (Western Desert, S Egypt)

Woronko, Barbara; Dłużewski, Maciej; Woronko, D.

doi:10.1016/j.aeolia.2017.10.001

Cited by 19 publications

(9 citation statements)

References 63 publications

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“…The quartz grains transported by aeolian processes from the foreshore to the backshore beach sediments must have modified these features. During high‐energy aeolian collisions, a thin quartz layer is often converted into amorphous silica, enhancing the chemical reactivity of the upturned plates (Chmielowska & Woronko, 2019; Z. Li et al, 2020; Woronko et al, 2017). So, this is a mixed region where dominant surface textures such as angular to subangular grains, arcuate steps, large conchoidal fractures, sharp edges and flat cleavages are inherited from quartz grains through subaqueous transport and coexist with aeolian surface textures such as upturned plates and adhering particles.…”

Section: Discussionmentioning

confidence: 99%

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Distinguishing depositional environments in the beach–dune system of Chandipur, India, based on sediment texture and quartz grain surface features

Saha

Sinha

2023

Earth Surf Processes Landf

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An attempt has been made to discern sedimentary environments in a tropical coastal setting in Chandipur, India, using variations in grain size. Samples were collected along one 100 m‐long cross‐shore transect extending from the tide/aqueous‐influenced seaward region to the aeolian‐dominated landward region. Various grain size data analysis approaches, like bivariate data plots and discrimination functions, were used to discriminate the sedimentary environments and establish the process of sediment deposition. The analytical results suggest that diverse granulometric parameters translate different sedimentary environments such as tidal flat, beach and dune. Additionally, the surface morphologies of quartz grains were used to understand the evolution of recent mechanical, chemical and mechanical–chemical processes in this tropical coastal region. Changes in the surficial microtextural properties of quartz grains were documented at various sites of all geomorphic units along this transect, from the tidal flat to the dune. One‐way analysis of variance (ANOVA) was used to understand the significant differences in microtextural features between these units. Subaqueous surface textures such as large conchoidal fractures, sharp edges, arcuate steps and straight and curved grooves were dominant in the grains of the tidal flat. The presence of meandering ridges, upturned plates, bulbous edges and adhering particles on quartz gradually increases as the transect ascends landward. Correlation plots between distance and microtextures, along with ANOVA, suggest that aeolian transportation modulated the surface textures. Such assessment of distinct sedimentary characteristics and transport processes may serve as a modern analogue for ancient deposits on the siliciclastic coast.

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Section: Discussionmentioning

confidence: 99%

“…During high-energy aeolian collisions, a thin quartz layer is often converted into amorphous silica, enhancing the chemical reactivity of the upturned plates (Chmielowska & Woronko, 2019;Z. Li et al, 2020;Woronko et al, 2017). So, this is a mixed region where dominant…”

Section: Characteristic Micromorphological Features In the Tidal Flat...mentioning

confidence: 99%

Distinguishing depositional environments in the beach–dune system of Chandipur, India, based on sediment texture and quartz grain surface features

Saha

Sinha

2023

Earth Surf Processes Landf

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“…The degree of roundness of sand grains depends on transport conditions, as well as the distance and derivation of sediments (e.g., Zhao et al, 2017). Most quartz dune-sand grains in hot deserts are usually not well rounded or are even subangular (Folk, 1978; Goudie and Watson, 1981; Goudie et al, 1987; Woronko et al, 2017). A microtexture analysis of quartz grain surfaces used classifications of Krinsley and Doornkamp (1973) and Mahaney (2002).…”

Section: Methodsmentioning

confidence: 99%

“…1800 AD and at present. Woronko et al, 2017). A microtexture analysis of quartz grain surfaces used classifications of Krinsley and Doornkamp (1973) and Mahaney (2002).…”

Section: Morphoscopy Of Sand Quartz Grainsmentioning

confidence: 99%

High-resolution insight into the Holocene environmental history of the Burullus Lagoon in northern Nile delta, Egypt

et al. 2021

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The modern Nile delta developed in the Middle and Late Holocene, and at its most northern-central point is situated at the Burullus Lagoon, which is environmentally diverse, including salt marshes, mudflats, and sand plains, and separated from a sea by a sand barrier overtopped with high sand dunes. The lagoon has been fed since the Middle Holocene by the Sebennitic branch of the Nile and marine intrusions through the Bughaz inlet. A sediment core (BO-1) was collected at the northeastern shore of the lagoon and sampled at centennial scale resolution in order to reconstruct the development of the lagoon. The results show that an initial and limited lagoon had developed at the end of the Early Holocene, but after a dry period ca. 7.2 cal ka BP it has been progressively transformed into a marshy area, with occasional inflows of sea water. Lower water level and higher salinity of the Burullus Lagoon at 6.0–5.5 and 4.8–4.2 cal ka BP reflected droughts in the Nile catchment. Thereafter, the river reactivated in the Burullus Lagoon area, and since 2.8 cal ka BP was accompanied by occasional inflows of sea water. Since ca. 0.8 cal ka BP, increased fluvial activity occurred in this part of the Nile delta, which terminated after construction of the Aswan dams in the twentieth century.

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“…These studies demonstrated that the microtexture types identified on heavy minerals are similar as those observed on quartz grains. Hence, in this study, zircon grain microtexture types are differentiated by following the classifications described for both zircon (Finzel, 2017;Linnemann et al, 2018;Mahaney, 2002;Mahaney, Fairén, Dohm, & Krinsley, 2012;Moral Cardona et al, 2005;Nallusamy, 2015;Zoleikhaei, Frei, Morton, & Zamanzadeh, 2016) Mohan, 2009;Vos, Vandenberghe, & Elsen, 2014;Woronko, Dłużewski, & Woronko, 2017).…”

Section: Study Areamentioning

confidence: 99%

Microtexture and U–Pb geochronology of detrital zircon grains in the Chachalacas beach, Veracruz State, Gulf of Mexico

et al. 2020

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trace element concentrations, and U-Pb geochronology of detrital zircon grains recovered from the Chachalacas beach in the western Gulf of Mexico were investigated to infer palaeoenvironmental conditions. The mineralogy of bulk sediments revealed the presence of both chemically stable (titano-magnetite, zircon, and quartz) and unstable (amphibole and K-feldspar) minerals. The zircon grain microtextures or surface features were grouped as two types: (a) mechanical origin and (b) mechanical and chemical origin. The mechanical surface features such as V-marks, arc shaped, and meandering steps indicate a high-energy littoral and sub-aqueous marine environment. The chemical surface features like solution pits, precipitation, solution crevasses, adhered particles, and silica pellicle revealed a silica saturated marine environment. The well-rounded zircon grains with bulbous edges are characterized by long transport and aeolian origin. The Th/U ratio, a negative Eu (Eu/Eu* = $0.08-0.72) and positive Ce (Ce/Ce* = >1) anomalies in the chondrite-normalized REE patterns of all zircon grains suggested that they primarily formed from magmatic processes. The detrital zircon grain U-Pb ages showed a wide variation from Cenozoic to Proterozoic with an abundance of Cenozoic ages ($1.59-64.3 Ma; n = 44), interpreted as mixing of beach sediments by a longshore current. The comparison of zircon grain ages of this study with ages reported from the source terranes revealed that the likely source for Cenozoic zircon grains was the Eastern Alkaline Province of Mexico. Similarly, the Mesozoic ($68.5-241.9 Ma) and Palaeozoic ($253.2-284.8 Ma) zircon grains in the Chachalacas beach were possibly derived from the Valle de Huizachal and Mesa Central provinces. Proterozoic ages from $574 to 1846 Ma indicated a probable contribution from the Oaxacan and Chiapas Massif complexes, which are dominated by Grenvillian basement rocks.

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Sand-grain micromorphology used as a sediment-source indicator for Kharga Depression dunes (Western Desert, S Egypt)

Cited by 19 publications

References 63 publications

Distinguishing depositional environments in the beach–dune system of Chandipur, India, based on sediment texture and quartz grain surface features

Distinguishing depositional environments in the beach–dune system of Chandipur, India, based on sediment texture and quartz grain surface features

High-resolution insight into the Holocene environmental history of the Burullus Lagoon in northern Nile delta, Egypt

Microtexture and U–Pb geochronology of detrital zircon grains in the Chachalacas beach, Veracruz State, Gulf of Mexico

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