Depositional cycles: an approach to the sequence stratigraphy of the Dakhla Formation, west Dakhla-Farafra stretch, Western Desert, Egypt

El-Azabi, Mounir H.; El-Araby, A.

doi:10.1016/s0899-5362(00)00064-6

Cited by 34 publications

(16 citation statements)

References 5 publications

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“…The present study is the first to interpret the high‐resolution sequence stratigraphic framework of the Kharga succession. Several pertinent sequence stratigraphic studies conducted in the nearby areas include El‐Azabi & El‐Araby (2000), Tantawy et al. (2001), Khalil & El‐Younsy (2003) and Hewaidy et al.…”

Section: Regional Settingmentioning

confidence: 99%

“… The Upper Cretaceous‐Lower Tertiary rock units of the Nile Valley facies and their time correlatives of Garra El‐Arbain facies exposed in the southern Western Desert of Egypt (modified after El‐Azabi & El‐Araby, 2000). …”

Section: Regional Settingmentioning

confidence: 99%

“…These members are interpreted as having formed under repeated shallow and deep marine settings due to sea‐level oscillations. This observation led El‐Azabi & El‐Araby (2000) to divide the three members of the Dakhla Formation into 10 depositional cycles based upon facies distribution patterns, stratal geometry and frequency of the associated fauna. The deposits of this formation have been formed in inner to outer shelf settings under a warm, wet tropical to sub‐tropical climate marked by heavy rainfall and predominantly chemical weathering in nearby hinterlands (Schrank, 1984; Ganz et al.…”

Section: Nile Valley Facies Associationmentioning

confidence: 99%

“…Three internal unconformities, marking regional and eustatic sea‐level falls, divide the Dakhla Formation into four depositional sequences (DkSQ1 to DkSQ4). These sequences were recorded by El‐Azabi & El‐Araby (2000) in the west Dakhla‐Farafra area in their study of Dakhla Formation facies characteristics and cyclicity. The fifth designated sequence in the Kharga Oasis comprises the Tarawan Formation (with its margin coeval to the upper part of the Garra Formation) and the lower part of the Esna Formation (T/EsSQ5).…”

Section: Depositional Sequences and Sequence Boundariesmentioning

confidence: 99%

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High‐resolution sequence stratigraphy of the Maastrichtian‐Ypresian succession along the eastern scarp face of Kharga Oasis, southern Western Desert, Egypt

El-Azabi¹,

Farouk²

2010

Sedimentology

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A thick Maastrichtian-Ypresian succession, dominated by marine siliciclastic and carbonate deposits of the regionally recognized Nile Valley and Garra El-Arbain facies associations, is exposed along the eastern escarpment face of Kharga Oasis, located in the Western Desert of Egypt. The main objectives of the present study are: (i) to establish a detailed biostratigraphic framework; (ii) to interpret the depositional environments; and (iii) to propose a sequence stratigraphic framework in order to constrain the palaeogeographic evolution of the Kharga sub-basin during the Maastrichtian-Ypresian time interval. The biostratigraphic analysis suggests the occurrence of 10 planktonic zones; two in the Early Maastrichtian (CF8b and CF7), four in the Palaeocene (P2, P3, P4c and P5) and four in the Early Eocene (E1, E2, E3 and E4). Recorded zonal boundaries and biostratigraphic zones generally match with those proposed elsewhere in the region. The stratigraphic succession comprises seven third-order depositional sequences which are bounded by unconformities and their correlative conformities which can be correlated within and outside Egypt. These depositional sequences are interpreted as the result of eustatic sea-level changes coupled with local tectonic activities. Each sequence contains a lower retrogradational parasequence set bounded above by a marine-flooding surface and an upper progradational parasequence set bounded above by a sequence boundary. Parasequences within parasequence sets are stacked in landwardstepping and seaward-stepping patterns indicative of transgressive and highstand systems tracts, respectively. Lowstand systems tracts were not developed in the studied sections, presumably due to the low-relief ramp setting. The irregular palaeotopography of the Dakhla Basin, which was caused by north-east to south-west trending submerged palaeo-highs and lows, together with the eustatic sea-level fluctuations, controlled the development and location of the two facies associations in the Kharga Oasis, the Nile Valley (open marine) and Garra El-Arbain (marginal marine).

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Section: Regional Settingmentioning

confidence: 99%

Section: Regional Settingmentioning

confidence: 99%

Section: Nile Valley Facies Associationmentioning

confidence: 99%

Section: Depositional Sequences and Sequence Boundariesmentioning

confidence: 99%

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High‐resolution sequence stratigraphy of the Maastrichtian‐Ypresian succession along the eastern scarp face of Kharga Oasis, southern Western Desert, Egypt

El-Azabi¹,

Farouk²

2010

Sedimentology

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“…The floor of the northern part of Farafra depression is mainly underlain by chalk of the Upper Cretaceous Khoman Formation and the Paleocene Tarawan Formation, whereas the shale of the Upper Cretaceous-Lower Paleocene Dakhla Formation is mainly exposed in the southern areas [3]. Limestones of the Lower Eocene El-Naqb and Farafra Formations cap prominent escarpments surrounding the semi-closed depression [9]. Several anticlines and synclines trending NE-SW (i.e., the Syrian Arc System) affect the Baharia depression, which is located to the northeast of the Farafra depression, and several major faults have affected the rock units within the Farafra Oasis.…”

Section: Study Areamentioning

confidence: 99%

Detection and Assessment of the Waterlogging in the Dryland Drainage Basins Using Remote Sensing and GIS Techniques

Bastawesy

Ali

Deocampo

et al. 2012

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Waterlogging and elevated soil salinity commonly develop in the cultivated and arable areas of the Sahara, particularly within closed drainage basins. Multi-temporal remote sensing data of the Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM+) for the Farafra Oasis in the Western Desert of Egypt were collected and processed to detect land cover changes, cultivations, and the extent of water ponding and seepage channels. The Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) has been processed to delineate catchment morphometric parameters and to examine the spatial distribution of cultivated fields and their relation to the extracted drainage networks. The soil of these closed drainage basins is mainly shallow and lithic with high calcium carbonate content. Therefore the downward percolation of excess irrigation water is limited by the development of subsurface hardpan, which also saturates the upper layer of soil with water. The subsurface seepage from the newly cultivated areas in the Farafra Oasis has revealed the pattern of buried alluvial channels, which are waterlogged and outlined by the growth of diagnostic saline shrubs. Furthermore, the courses of these waterlogged channels are coinciding with their counterparts of the SRTM DEM, and the recent satellite images show that the surface playas in the downstream of these channels are partially occupied by water ponds. The geomorphology of closed drainage basins has to be considered when planning for new cultivation in dry land catchments to better control waterlogging hazard. Accordingly, several management strategies can be adopted to combat land degradation by water logging including; cultivation of certain areas and localities within each drainage basins, and conveying the drainage and seepage water through the inactive alluvial channels into abandoned playas, which are reserved for evaporation. Moreover, farm management and balancing irrigation water, salt leaching, and evapo-transpiration are also critical to lessen the development of waterlogging.

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Geology of Dakhla Oasis, Western Desert, Egypt

Zaghloul

2021

Sustainable Water Solutions in the Western Desert, Egypt: Dakhla Oasis

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Depositional cycles: an approach to the sequence stratigraphy of the Dakhla Formation, west Dakhla-Farafra stretch, Western Desert, Egypt

Cited by 34 publications

References 5 publications

High‐resolution sequence stratigraphy of the Maastrichtian‐Ypresian succession along the eastern scarp face of Kharga Oasis, southern Western Desert, Egypt

High‐resolution sequence stratigraphy of the Maastrichtian‐Ypresian succession along the eastern scarp face of Kharga Oasis, southern Western Desert, Egypt

Detection and Assessment of the Waterlogging in the Dryland Drainage Basins Using Remote Sensing and GIS Techniques

Geology of Dakhla Oasis, Western Desert, Egypt

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