干旱区生态环境知识资源中心(Arid): Maastrichtian-Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework

Arid

DOI	10.1007/s12517-020-06271-0
	Maastrichtian-Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework
	Metwally, Amr A.; Soliman, Hassan A.; Obaidalla, Nageh A.; Thabet, Assma G.
通讯作者	Metwally, AA (corresponding author), Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:1
英文摘要	Integrated lithostratigraphic and biostratigraphic data of two well-exposed Maastrichtian-Paleocene successions, namely, the Owina and the Abu Minqar sections (Dakhla Oasis, Western Desert, Egypt), led to enhance the age resolution and shed lights on the paleoenvironmental conditions throughout the deposition of the investigated sequences. The integrated biostratigraphic data provide eight calcareous planktonic zones (five planktonic foraminifera, and three calcareous nannofossil zones) cover the studied interval. The paleoenvironmental setting of the Maastrichtian interval which represented by the lower Kharga Shale unit (Micula murus and Gansserina gansseri calcareous plankton zones) reveals shallow marine environmental conditions of inner neritic probably of marginal setting with high organic matter influx and low-oxygen level interrupted by some transgressive phases. While, shallower marine conditions associated with a sea-level drop mark the Cretaceous/Paleogene (K/Pg) boundary. The lowermost part of the Paleocene interval (NP3, NP4, P1b, P1c, and P2 calcareous plankton zones) which covered the lower part of the upper Kharga Shale unit is marked by middle-outer neritic depositional setting, well-oxygenated seawater, as well as a low organic matter influx coupled with relative sea-level rise. Above this level until reach the base of the Tarawan Formation, a major drop in the sea-level is observed. This interval is marked by absence of the calcareous planktonic taxa. Only agglutinated foraminiferal taxa are recorded during this interval. While the Tarawan Formation (P4b planktonic foraminiferal Zone) is marked by outer neritic depositional setting that represents a sea-level transgressive phase. According to the field observations and the presence/absence of the calcareous planktonic zonal marker species; two tectonic events are detected. The tectonic event I took place at the K/Pg boundary and resulted in a significant hiatus at the studied area. Tectonic event II is observed at the contact between the Dakhla and the Tarawan formations across the Danian-Selandian transition. It is evidenced by the existence of an erosive (irregular) surface at the basal part of the Tarawan Formation. These events could be attributed to the echo of the Syrian Arc tectonism which interrupted the global sea-level curve throughout the Maastrichtian-Paleocene time.
英文关键词	Maastrichtian-Paleocene Nannofossil and foraminifera Paleoenvironment Sea-level change
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608040600008
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347719
作者单位	[Metwally, Amr A.; Soliman, Hassan A.; Obaidalla, Nageh A.; Thabet, Assma G.] Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt
推荐引用方式 GB/T 7714	Metwally, Amr A.,Soliman, Hassan A.,Obaidalla, Nageh A.,et al. Maastrichtian-Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework[J],2021,14(1).
APA	Metwally, Amr A.,Soliman, Hassan A.,Obaidalla, Nageh A.,&Thabet, Assma G..(2021).Maastrichtian-Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework.ARABIAN JOURNAL OF GEOSCIENCES,14(1).
MLA	Metwally, Amr A.,et al."Maastrichtian-Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework".ARABIAN JOURNAL OF GEOSCIENCES 14.1(2021).