Metre-scale cyclicity in Middle Eocene platform carbonates in northern Egypt: Implications for facies development and sequence stratigraphy

Tawfik, Mohamed; El‐Sorogy, Abdelbaset S.; Moussa, Mahmoud

doi:10.1016/j.jafrearsci.2016.04.006

Cited by 20 publications

(5 citation statements)

References 45 publications

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“…Although the Eocene sequence stratigraphy in Eocene successions of north Eastern Desert was subject to few studies, a sequence stratigraphic classification for the Middle-Upper Eocene succession in the studied area is attempted also here for the first time. Although the Eocene sequence stratigraphy of north Eastern Desert was previously studied by a few number of authors (Tawfik et al, 2016;Saber and Salama, 2017;Hussein, 2019), the present study highlight the planktonic foraminifera ratio and sea level changes from the perspective of sequence stratigraphy.…”

Section: Introductionmentioning

confidence: 57%

Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications

Salama

Sayed

Saber

et al. 2021

Palaeontol Electron

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The Eocene succession at Beni Suef -El Zaafarana District in north Eastern Desert is rich in planktonic foraminiferal assemblages. The main objectives of this work are to use the planktonic foraminifera to recognize the biostratigraphy for the Middle-Upper Eocene succession in the study area. Seventy planktonic foraminiferal species belonging to 20 genera and seven families are identified from the Eocene El Fashn and Beni Suef formations. Three planktonic foraminiferal biozones are recognized. These are from older to younger Morozovelloides crassatus Zone (late Middle Eocene) that is recorded from El Fashn Formation, Globigerinatheka semiinvoluta Zone (latest Middle Eocene -Late Eocene) and Globigerinatheka index Zone (Late Eocene age) that are recorded from the Beni Suef Formation while the Maadi Formation is found barren in planktonic foraminifera. These zones are correlated with those from nearby areas in Egypt and the Mediterranean regions. The Middle/Upper Eocene (Bartonian/Priabonian) boundary is discussed here in detail. The percentage of the planktonic foraminifera in the total foraminiferal content (P %) points to a change in water depth. There was a significant decrease in the planktonic/benthic foraminiferal ratio from the late Middle Eocene El Fashn Formation to the Late Eocene Maadi Formation at Beni Suef -El Zaafarana District. This ratio change supports a shallowing upward in paleodepth. Based on the lithology, planktonic/benthic ratio and the obtained water depth, the studied Eocene succession could be subdivided into four depositional sequences. These sequences agree with the global eustatic sea-level and the depositional sequences in nearby areas.

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Section: Introductionmentioning

confidence: 57%

Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications

Salama

Sayed

Saber

et al. 2021

Palaeontol Electron

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“…Westward, the Bartonian rocks have been changed laterally at Minqar el Rayan area, southwest Fayoum, and represented by thick-bedded limestone with Nummulites spp., bivalve shells and bryozoan bands at base, followed upward by clastic sediments. The correlation of Bartonian rocks revealed the dominance of inner neritic depositional environments that represented by tidal flat and lagoonal facies in Fayoum area, lagoonal and shoal facies in Cairo area, and reefal facies in north Eastern Desert (Sallam et al 2015a;Tawfik et al 2016). These lithofacies became deeper eastward and represented by inner-middle neritic facies in Sinai and outer neritic facies Jordon.…”

Section: Discussionmentioning

confidence: 98%

Microfacies analysis and depositional environments of the Middle Eocene (Bartonian) Qurn Formation along Qattamiya—Ain Sokhna district, Egypt

El-Moghny

Afifi²

2022

Carbonates Evaporites

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The exposed Middle Eocene (Bartonian) Qurn Formation along Qattamiya—Ain Sokhna district is measured, sampled and microscopically investigated. Besides, the vertical distribution of the chemical oxides and strontium (Sr) has been determined to identify their petrographic, geochemical characteristics and interpret their depositional environments. The facies analysis (lithofacies, microfacies, and biofacies) of the studied rocks revealed the recognition of three microfacies associations: (1) restricted lagoon facies association (FT1–FT3), (2) open lagoon facies association (FT4–FT7), and (3) shoal facies association (FT8–FT9). Lithofacies and microfacies analysis of Middle Eocene rocks along Qattamiya—Ain Sokhna district reflect carbonate inner ramp regime ranging from restricted lagoon to shoal buildup depositional conditions. These identified inner ramp microfacies are changed eastward to mid-ramp, while they are represented westward by tidal flat and shallow lagoonal facies. The vertical distribution of both CaO and MgO revealed that MgO is related mainly to the dolomitization process rather than primary deposition. The vertical distribution of Sr in the studied carbonate samples matches with that of SiO2, thus may be related to the warm environmental conditions.

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“…This cement is responsible for a decrease in separate moldic porosity (Figure 8c). The last type of marine cementation is a drusy and granular calcite spar of this final cementation phase, which is widespread, (Tawfik et al, 2016). The development of coral rudstone and floatstone signifies back reef behind the reef core (Cabioch et al, 2008).…”

Section: Diagenetic Sequence On the Foraminiferal Testsmentioning

confidence: 99%

“…Although the general stratigraphy of the Middle Eocene has been described and examined by many authors, the sequence stratigraphy of the studied sections has been examined by only a few of them, such as El-Azabi ( 2006), Abu Elghar (2012), El-Fawal et al (2013), and Tawfik et al (2016. El-Azabi ( 2006) discussed the sequence stratigraphy of the Middle Eocene sequences in the North Eastern Desert and he determined three sequences in the studied sections.…”

Section: Sequence Stratigraphymentioning

confidence: 99%

Relationships between sequence stratigraphy and diagenesis of corals and foraminifers in the Middle Eocene, northern Egypt

Tawfik¹,

El‐Sorogy²,

Moussa³

2017

Turkish J Earth Sci

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Outcrops of the Middle Eocene in northern Egypt represent a Tethyan reef-rimmed carbonate platform with bedded innerplatform facies. The diagenesis of these outcrops was studied in detail. The facies are characterized by a reef core, back reef and outer lagoon, shoal, inner lagoon, and tidal flat carbonate sequences. The diagenetic sequences on the scleractinian corals and foraminifers were thoroughly examined. These sequences show various diagenetic features during episodes of fluctuating sea levels and appear to be related to the primary composition of the studied components and the transgressive-regressive cycles. The carbonate diagenetic history of the examined samples successively includes marine-phreatic, mixed marine-meteoric, and shallow burial diagenesis. Most of the coral samples are affected by micritization and neomorphism and most of the foraminiferal samples are affected by micritization, dolomitization, glauconitization, or cementation. A sequence-stratigraphic analysis was carried out by integrating field and laboratory studies. The investigated sections were subdivided into three third-order sequences named S1, S2, and S3. The distribution of diagenetic fabrics was compared to a sequence stratigraphic framework. This has resulted in, for example, recording isopachous cement and autochthonous glauconitization mostly in the transgressive parts, while dolomitization, drusy cement, and biomoldic and vuggy porosities are recorded in the regressive parts; dedolomitization, allochthonous glauconitization, and ferrugination processes occurred at the sequence boundaries.

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Metre-scale cyclicity in Middle Eocene platform carbonates in northern Egypt: Implications for facies development and sequence stratigraphy

Cited by 20 publications

References 45 publications

Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications

Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications

Microfacies analysis and depositional environments of the Middle Eocene (Bartonian) Qurn Formation along Qattamiya—Ain Sokhna district, Egypt

Relationships between sequence stratigraphy and diagenesis of corals and foraminifers in the Middle Eocene, northern Egypt

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