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• W4308459543 abstract "Abstract Benthic foraminiferal analysis (315 samples, 16,271 specimens) of the shallow water (< 100 m) Maastrichtian–Thanetian rocks from the Dakhla Oasis (Western Desert, Egypt) were studied to infer the inter–relationships between species diversity, palaeooxygenation, palaeoproductivity, and palaeodepth and changes at the Cretaceous–Paleogene (K/Pg) boundary. Positive and significant correlations are noted between these proxies, suggesting a well–oxygenated oligotrophic environment. However, a brief interval (mid– lower Maastrichtian) of increased palaeoproductivity with reduced diversity and oxygenation (ventilation) is noted (a characteristic of mesotrophic–eutrophic settings) that coincides with very shallow waters during a Highstand System Tract (HST), and dominated by the dysoxic agglutinated species Ammobaculites khargaensis . The diversity index, Fisher’s α (< 5) and paleodepth proxy (foraminiferal wall structure types) also suggests a shallow neritic (largely littoral) depth for the entire study interval. At the bottom of the study section (Planktic Foraminiferal Zones CF8b-CF7), species diversity, palaeooxygenation, and palaeoproductivity are high. From the K/Pg boundary to the post K/Pg period, these variables are low and fluctuating with moderate species dominance. According to the available data, a 40% total extinction rate was seen after the K/Pg hiatus, with 38% of agglutinated species and 40% of calcareous extinct species. The period immediately following the K/Pg boundary is characterised by increased basinal ventilation and decreased palaeoproductivity, which are attributable to changes in sea level and concurrent regional subsidence. However, as stable as the community structure was (at or just after K/Pg), the changes in species composition (assemblage) were dramatic marked by a change from a pre–K/Pg agglutinated–dominated fauna ( Haplophragmoides – Ammobaculites ) to a post–K/Pg calcareous assemblage ( Cibicodoides – Cibicides – Anomalinoides )." @default.
• W4308459543 created "2022-11-12" @default.
• W4308459543 creator A5004740184 @default.
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• W4308459543 creator A5036995255 @default.
• W4308459543 creator A5041641220 @default.
• W4308459543 creator A5084231854 @default.
• W4308459543 date "2022-11-07" @default.
• W4308459543 modified "2023-10-18" @default.
• W4308459543 title "Relationship of Maastrichtian–Thanetian benthic foraminiferal species diversity, palaeooxygenation and palaeoproductivity in shallow waters of Western Desert, Egypt" @default.
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