干旱区生态环境知识资源中心(Arid): Climate variability and paleoceanography during the Late Cretaceous: Evidence from palynology, geochemistry and stable isotopes analyses from the southern Tethys

Arid

DOI	10.1016/j.cretres.2021.104831
	Climate variability and paleoceanography during the Late Cretaceous: Evidence from palynology, geochemistry and stable isotopes analyses from the southern Tethys
	Mansour, Ahmed; Wagreich, Michael; Gier, Susanne; Gentzis, Thomas; Kloetzli, Urs; Tahoun, Sameh S.; Elewa, Ashraf M. T.
通讯作者	Mansour, A (corresponding author), Minia Univ, Fac Sci, Geol Dept, Al Minya 61519, Egypt.
来源期刊	CRETACEOUS RESEARCH
ISSN	0195-6671
EISSN	1095-998X
出版年	2021
卷号	126
英文摘要	The Late Cretaceous epoch witnessed significant changes in climate and considerable perturbations in the global carbon cycle, among others leading to Oceanic Anoxic Events (OAEs). Investigating the pale-oceanographic setting in the southern Tethys (northern Egypt) is critical for a better understanding of the triggering mechanisms that occurred during deposition as a result of a greenhouse climate. Here we present bulk rock geochemical and stable isotopic proxies from the biostratigraphically well constrained Abu Roash A Member (180 m thick) deposited through the late Coniacian-earliest Campanian in the Abu Gharadig Basin of the north Western Desert of Egypt, to investigate whether there was a record of OAE3 and deposition of organic rich facies or oxic Cretaceous Oceanic Red Beds (CORBs). Paleoclimate in this low-latitude Tethyan setting was investigated, where warm to hot greenhouse climate prevailed based on specific dinoflagellate cyst taxa and regional correlation of the delta O-18(carb) trends, despite a long-term temperature fall from the mid-Santonian onwards. Low river discharge and terrigenous input during arid conditions, inferred from elemental geochemistry and clay mineralogy, led to low marine produc-tivity during enhanced carbonate production, and thus triggered low organic matter accumulation. The neodymium isotope signatures from bulk carbonate fractions along with available coupled ocean-atmosphere climate models indicate that the studied area witnessed a westward Tethys circumglobal current. These paleocirculation patterns caused enhanced water mixing, resulting in enhanced water column ventilation. These settings led to the deposition of organic-poor CORBs and the absence of the organic-rich OAE3 deposits. (C) 2021 Elsevier Ltd. All rights reserved.
英文关键词	Paleoclimate Tethys paleocirculation Dinoflagellate cysts Cretaceous oceanic red beds Abu Gharadig basin
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000685072600001
WOS关键词	CARBON-ISOTOPE ; OXYGEN-ISOTOPE ; WESTERN-DESERT ; ORGANIC-CARBON ; ND ISOTOPES ; EVOLUTION ; STRATIGRAPHY ; OCEAN ; PRESERVATION ; NEODYMIUM
WOS类目	Geology ; Paleontology
WOS研究方向	Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362907
作者单位	[Mansour, Ahmed; Elewa, Ashraf M. T.] Minia Univ, Fac Sci, Geol Dept, Al Minya 61519, Egypt; [Wagreich, Michael; Gier, Susanne] Univ Vienna, Fac Earth Sci Geog & Astron, Dept Geol, Vienna, Austria; [Gentzis, Thomas] Core Labs LP, 6316 Windfern Rd, Houston, TX 77040 USA; [Kloetzli, Urs] Univ Vienna, Fac Earth Sci Geog & Astron, Dept Lithospher Res, Vienna, Austria; [Tahoun, Sameh S.] Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt
推荐引用方式 GB/T 7714	Mansour, Ahmed,Wagreich, Michael,Gier, Susanne,et al. Climate variability and paleoceanography during the Late Cretaceous: Evidence from palynology, geochemistry and stable isotopes analyses from the southern Tethys[J],2021,126.
APA	Mansour, Ahmed.,Wagreich, Michael.,Gier, Susanne.,Gentzis, Thomas.,Kloetzli, Urs.,...&Elewa, Ashraf M. T..(2021).Climate variability and paleoceanography during the Late Cretaceous: Evidence from palynology, geochemistry and stable isotopes analyses from the southern Tethys.CRETACEOUS RESEARCH,126.
MLA	Mansour, Ahmed,et al."Climate variability and paleoceanography during the Late Cretaceous: Evidence from palynology, geochemistry and stable isotopes analyses from the southern Tethys".CRETACEOUS RESEARCH 126(2021).