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Facies characteristics, diagenetic phenomena, and the impact of clay minerals on the dolomitization of Abu Tartur phosphorites (Western Desert, Egypt)

Ayyat, Abdalla M. El ; Essa, Mahmoud A.

Journal of Sedimentary Environments, 2024-03, Vol.9 (1), p.1-18 [Periódico revisado por pares]

Cham: Springer International Publishing

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  • Título:
    Facies characteristics, diagenetic phenomena, and the impact of clay minerals on the dolomitization of Abu Tartur phosphorites (Western Desert, Egypt)
  • Autor: Ayyat, Abdalla M. El ; Essa, Mahmoud A.
  • Assuntos: cities ; Earth and Environmental Science ; Earth Sciences ; Environment ; Evolutionary Biology ; Geography ; Sedimentology ; towns ; Urban Geography ; Urbanism (inc. megacities
  • É parte de: Journal of Sedimentary Environments, 2024-03, Vol.9 (1), p.1-18
  • Descrição: The present study deals with the microfacies diagnostic features of the Duwi Formation (Western Desert, Egypt). The aim is also to provide some insight into the spatio-temporal occurrence of diagenetic features, especially dolomitization in the different facies and their paragenesis. The clay mineralogy has been studied aiming to recognize its role as a principal source of Mg +2 for dolomitization. Stratigraphically, the Duwi Formation covers unconformably the Quseir Formation and rests conformably under the Dakhla Formation. Sedimentologically, the Duwi Formation includes phosphorite, black shale, glauconite, phosphatic limestone, chalky limestone, fine sandstone to siltstone, and dolomite. These sediments represent the first onset of fully marine conditions and accumulated in a pre-existing depression enclosed by the Dakhla uplift in the west and the Kharga uplift in the east. The presence of dolomites is assigned to strong dolomitization at several horizons. Sometimes, dolomite is represented by scattered rhombs or pockets within other microfacies types. The smectite–illite conversion model is invoked as the supplier of Mg +2 and Ca +2 ions that formed dolomites during the late stages of diagenesis. However, more detailed research work is needed to better characterize the role played by clays during the formation of dolomite in the study area.
  • Editor: Cham: Springer International Publishing
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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