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- W4386575067 abstract "Ooids are a critical yet enigmatic carbonate grains in the geological record. Previous studies have focused their efforts on studying the mode of ooid formation throughout the Phanerozoic via experimental, numerical simulations, and field studies. To date, however, there is little discussion around factors governing the texture, mineralogy, structure, size, and geometry of Cenozoic ooids, particularly in Saudi Arabia. The present article aims to provide insights on key factors controlling the differential growth of Cenozoic ooids in Saudi Arabia by comparing two contrasting carbonate environments and tectonic settings. Here, we studied the Holocene (0.4–2 kya) ooids developed in the tidally dominated carbonate ramp of the Arabian Gulf under a passive margin setting and the Miocene (15–21 mya) ooids from the Red Sea that were developed in a tectonically active, wave-dominated fault-bounded carbonate platform. The Holocene ooids were characterized by aragonitic, heavily micritized and small (max:550 μm) ooids with bioclast-dominated nuclei. In contrast, the Miocene ooids were replaced by dolomite, larger in size (max:820 μm) and significantly less micritized with variable nuclei compositions, such as rock fragments and bioclasts. The variation in the intensity of bioerosion and micritization suggest the Miocene ooids experienced lesser resting stage time than the Holocene ooids developed under the tide regime due to active wave actions. In addition, the Miocene ooids were developed in a fault-bounded margin allowing a higher carbonate saturation state to concentrate in that zone while the Holocene ooids were developed under a widespread distribution of carbonate saturation state in a vast carbonate ramp setting. These findings indicate that original platform geometry and depositional system (tide-vs wave-dominated) are substantial in dictating the duration of ooid resting stage and distribution of carbonate saturation state across the platforms. All these combined, allows the Miocene ooids to grow larger and reaching its equilibrium size faster. This study highlights the importance of coupling platform architecture and other key environmental parameters (wave actions, sediment supply, and tectonic activities) in understanding the formation of Cenozoic ooids." @default.
- W4386575067 created "2023-09-10" @default.
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- W4386575067 date "2023-11-01" @default.
- W4386575067 modified "2023-10-10" @default.
- W4386575067 title "A tale of two Arabian Cenozoic ooids: Factors controlling the differential growth of ooids across the Arabian Plate" @default.
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- W4386575067 doi "https://doi.org/10.1016/j.jafrearsci.2023.105046" @default.
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