干旱区生态环境知识资源中心(Arid): A snapshot into the Oligocene vegetation of the Tethyan southern shores: new fossil pollen evidence from North Africa (Egypt)

Arid

DOI	10.1080/01916122.2021.2023057
	A snapshot into the Oligocene vegetation of the Tethyan southern shores: new fossil pollen evidence from North Africa (Egypt)
	El Atfy, Haytham; El Beialy, Salah Y.; Zobaa, Mohamed K.; Taha, Asmaa A.; Uhl, Dieter
通讯作者	El Atfy, H (corresponding author)，Mansoura Univ, Fac Sci, Geol Dept, Mansoura 35516, Egypt.
来源期刊	PALYNOLOGY
ISSN	0191-6122
EISSN	1558-9188
出版年	2021-12
英文摘要	A palynological investigation was carried out on 24 samples from the Oligocene Dabaa Formation, which cuts across the Amana-1X well, located in the Abu El Gharadig Basin, north Western Desert, Egypt. Palynological evidence presented here suggests an early Oligocene age for the studied Dabaa Formation. In addition, the palynological assemblages provide supplementary evidence for depositional environments. They are generally indicative of outer-shelf to upper slope environment under oxic to anoxic conditions for the lower part of the studied Dabaa Formation, but infrequent occurrences of more diverse assemblages suggest an inner neritic marine environment for strata at some levels in the upper part of the studied section. It was during the Oligocene that marked floral changes leading to the development of modern plant associations began such as temperate deciduous forests (with e.g., Acer and Betulaceae) which expanded greatly in the mid latitudes. A distinctive vegetational pattern could be outlined within the deposition of the Dabaa Formation. This pattern includes mangroves represented by taxa such as Zonocostites ramonae, Psilatricolporites crassus and Verrucatosporites usmensis. Another considerably different association with plenty of the freshwater algae Botryococcus and Pediastrum spp. at this level or tropical forests at slightly elevated altitudes (ever wet climate) are dominated by a variety of tropical forest taxa including Malvaceae and Striatricolpites, together with Retitricolporites irregularis, Psilatricolporites operculatus, Retibrevitricolporites ibadanensis, Retitricolporites spp. and Psilamonocolpites spp. in addition to ferns and tree ferns where tropical floras dominate. Also recognized are elements of savanna or open woodland (less humid climate) taxa like Poaceae pollen (grass) such as Monoporopollenites annulatus associated with Amaranthaceae (e.g., Chenopodipollis multiplex), Cyperaceae spp., Echiperiporites estelae, Proteacidites cooksonii, Cicatricosisporites dorogensis and Pteris. Finally, the montane ecosystems may have occurred at the slopes of mountains including rare pollen assigned to Sapotaceae (Psilastephanocolporites spp.) and Anacardiaceae (Retitricolpites simplex) which are probably part of the palynoflora due to long-distance transport.
英文关键词	Africa Egypt palaeoclimate vegetation palaeoenvironment palynology Dabaa Formation Oligocene
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000750898900001
WOS关键词	WESTERN DESERT ; DABAA FORMATION ; TERTIARY PALYNOLOGY ; EARLY EOCENE ; SEDIMENTS ; BASIN ; MIOCENE ; RECORD ; PALYNOSTRATIGRAPHY ; PALEOENVIRONMENTS
WOS类目	Plant Sciences ; Paleontology
WOS研究方向	Plant Sciences ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377033
作者单位	[El Atfy, Haytham; El Beialy, Salah Y.; Taha, Asmaa A.] Mansoura Univ, Fac Sci, Geol Dept, Mansoura 35516, Egypt; [El Atfy, Haytham] Eberhard Karls Univ Tubingen, Inst Geowissensch, Tubingen, Germany; [Zobaa, Mohamed K.] Univ Texas Permian Basin, Dept Geosci, Odessa, TX USA; [Uhl, Dieter] Senckenberg Forschungsinst & Naturmuseum Frankfur, Frankfurt, Germany
推荐引用方式 GB/T 7714	El Atfy, Haytham,El Beialy, Salah Y.,Zobaa, Mohamed K.,et al. A snapshot into the Oligocene vegetation of the Tethyan southern shores: new fossil pollen evidence from North Africa (Egypt)[J],2021.
APA	El Atfy, Haytham,El Beialy, Salah Y.,Zobaa, Mohamed K.,Taha, Asmaa A.,&Uhl, Dieter.(2021).A snapshot into the Oligocene vegetation of the Tethyan southern shores: new fossil pollen evidence from North Africa (Egypt).PALYNOLOGY.
MLA	El Atfy, Haytham,et al."A snapshot into the Oligocene vegetation of the Tethyan southern shores: new fossil pollen evidence from North Africa (Egypt)".PALYNOLOGY (2021).