干旱区生态环境知识资源中心(Arid): Provenance, tectonic setting and source area-paleoweathering of sandstones of the Bahariya Formation in the Bahariya Oasis, Egypt: An implication to paleoclimate and paleogeography of the southern Neo-Tethys region during Early Cenomanian

Arid

DOI	10.1016/j.sedgeo.2020.105822
	Provenance, tectonic setting and source area-paleoweathering of sandstones of the Bahariya Formation in the Bahariya Oasis, Egypt: An implication to paleoclimate and paleogeography of the southern Neo-Tethys region during Early Cenomanian
	Wanas, Hamdalla A.; Assal, Ehab M.
通讯作者	Wanas, HA (corresponding author), King AbdulAziz Univ, Dept Petr Geol & Sedimentol, Fac Earth Sci, Jeddah, Saudi Arabia.
来源期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
EISSN	1879-0968
出版年	2021
卷号	413
英文摘要	The Lower Cenomanian Bahariya Formation forms the most prolific hydrocarbon reservoir in the Western Desert of Egypt, and represents a good example to illustrate the paleoclimatic conditions and paleogeographical evolution in the southern Neo-Tethys region during Early Cenomanian. It is also particularly important for its diverse vertebrate fauna including dipnoans, chelonians, crocodyliforms, squamates, plesiosaurs, decapod crustaceans and dinosaurs, which reflect sustained regional biostratigraphical and paleoenvironmental significance. In this study, a multidisciplinary approach of fieldwork, petrography and bulk-rock geochemistry of sandstones of the Bahariya Formation has been performed to constrain their provenance, tectonic setting, source area-paleoweathe ring and paleoclimatic conditions within the Neo-Tethyan realm. Petrographically, the studied sandstones are mainly of quartz-arenite type with subordinate sub-arkose and sublithic ones. Quartz types, trace and rare earth element concentrations and ratios indicate the sandstones were sourced from felsic granitic rocks with a rare contribution of felsic gneisses. The modal analysis reflects that the sandstones are mainly of cratonic interior and quartzose recycled tectonic provenance. The chondrite-normalized REE distribution pattern of the Bahariya sandstones are characterized by enriched LREE and flat HREE similar to those of UCC with negative Eu/Eu* anomalies. Major and trace elements of the sandstones suggest their deposition on a Neo-Tethys passive continental margin related to the Early Cretaceous rifting. The weathering indices (CIA, CIW, PIA and ICV) and the Al2O3-(CaO T Na2O)-K2O diagram suggest moderate to severe chemical weathering in the source area under semi-humid to humid climatic conditions. In conclusions, the Bahariya sandstones could be sourced by a fluvial reworking of moderately- to intensively-weathered Precambrian granites and gneisses of the surrounding Gebel Uweinat Massive (at the southwest of the study area), and were deposited in a low-lying basin (Bahariya area) of the Neo-Tethys passive continental margin. In a broad interest, results of this study could contribute in a reconstruction of the paleoclimatic conditions and paleogeographical evolution of the southern Neo-Tethys region during Early Cenomanian. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Provenance Tectonic setting Early Cenomanian Bahariya Formation Bahariya Oasis Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608177900002
WOS关键词	PENNSYLVANIAN-PERMIAN AGE ; SEDIMENTARY-ROCKS ; MEXICO IMPLICATIONS ; CRUSTAL EVOLUTION ; BASIN INVERSION ; WESTERN DESERT ; CENTRAL-AFRICA ; GEOCHEMISTRY ; SHALES ; PETROGRAPHY
WOS类目	Geology
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/2XILL650/348202
作者单位	[Wanas, Hamdalla A.] King AbdulAziz Univ, Dept Petr Geol & Sedimentol, Fac Earth Sci, Jeddah, Saudi Arabia; [Assal, Ehab M.] Damietta Univ, Geol Dept, Fac Sci, Dumyat 34517, Egypt
推荐引用方式 GB/T 7714	Wanas, Hamdalla A.,Assal, Ehab M.. Provenance, tectonic setting and source area-paleoweathering of sandstones of the Bahariya Formation in the Bahariya Oasis, Egypt: An implication to paleoclimate and paleogeography of the southern Neo-Tethys region during Early Cenomanian[J],2021,413.
APA	Wanas, Hamdalla A.,&Assal, Ehab M..(2021).Provenance, tectonic setting and source area-paleoweathering of sandstones of the Bahariya Formation in the Bahariya Oasis, Egypt: An implication to paleoclimate and paleogeography of the southern Neo-Tethys region during Early Cenomanian.SEDIMENTARY GEOLOGY,413.
MLA	Wanas, Hamdalla A.,et al."Provenance, tectonic setting and source area-paleoweathering of sandstones of the Bahariya Formation in the Bahariya Oasis, Egypt: An implication to paleoclimate and paleogeography of the southern Neo-Tethys region during Early Cenomanian".SEDIMENTARY GEOLOGY 413(2021).