干旱区生态环境知识资源中心(Arid): Relationship of Maastrichtian-Thanetian benthic foraminiferal species diversity, palaeooxygenation, and palaeoproductivity in shallow waters of the Western Desert, Egypt

Arid

DOI	10.1007/s00367-023-00745-2
	Relationship of Maastrichtian-Thanetian benthic foraminiferal species diversity, palaeooxygenation, and palaeoproductivity in shallow waters of the Western Desert, Egypt
	Farouk, Sherif; Jain, Sreepat; Al-Kahtany, Khaled; Ahmad, Fayez; Abdeldaim, Ahmed
通讯作者	Farouk, S
来源期刊	GEO-MARINE LETTERS
ISSN	0276-0460
EISSN	1432-1157
出版年	2023
卷号	43 期号:1
英文摘要	Benthic foraminiferal analysis (315 samples, 16,271 specimens) of the shallow water (< 100 m) Maastrichtian-Thanetian rocks from the Dakhla Oasis (Western Desert, Egypt) was 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 alpha (< 5), and paleodepth proxy (foraminiferal wall structure types) also suggest 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 fluctuate with moderate species dominance. Data suggests an overall 40% benthic foraminiferal species (38% of agglutinated and 40% of calcareous extinct species) extinction rate after the K/Pg hiatus. The period immediately following the K/Pg boundary is characterized by increased basinal ventilation and decreased palaeoproductivity, which are attributed to changes in sea level and concurrent regional subsidence. However, as stable as the community structure was at or just after the K/Pg boundary, the changes in species composition (assemblage) were dramatic and marked by a change from a pre-K/Pg agglutinated-dominated fauna (Haplophragmoides-Ammobaculites) to a post-K/Pg calcareous one (Cibicodoides-Cibicides-Anomalinoides).
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000921836600002
WOS关键词	CRETACEOUS-TERTIARY BOUNDARY ; SEA-LEVEL CHANGES ; DEEP-SEA ; DAKHLA OASIS ; PALEOENVIRONMENTAL CHANGES ; ENVIRONMENTAL-INFLUENCES ; BENTHONIC FORAMINIFERA ; TROPICAL ATLANTIC ; MASS EXTINCTION ; DEMERARA RISE
WOS类目	Geosciences, Multidisciplinary ; Oceanography
WOS研究方向	Geology ; Oceanography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396718
推荐引用方式 GB/T 7714	Farouk, Sherif,Jain, Sreepat,Al-Kahtany, Khaled,et al. Relationship of Maastrichtian-Thanetian benthic foraminiferal species diversity, palaeooxygenation, and palaeoproductivity in shallow waters of the Western Desert, Egypt[J],2023,43(1).
APA	Farouk, Sherif,Jain, Sreepat,Al-Kahtany, Khaled,Ahmad, Fayez,&Abdeldaim, Ahmed.(2023).Relationship of Maastrichtian-Thanetian benthic foraminiferal species diversity, palaeooxygenation, and palaeoproductivity in shallow waters of the Western Desert, Egypt.GEO-MARINE LETTERS,43(1).
MLA	Farouk, Sherif,et al."Relationship of Maastrichtian-Thanetian benthic foraminiferal species diversity, palaeooxygenation, and palaeoproductivity in shallow waters of the Western Desert, Egypt".GEO-MARINE LETTERS 43.1(2023).