干旱区生态环境知识资源中心(Arid): Provenance, tectonic setting, and source area palaeoweathering of the Lower Cretaceous Nubian sandstones at Gebel Duwi, Eastern Desert, Egypt: inferences from mineralogy and whole-rock geochemistry

Arid

DOI	10.1007/s12517-021-08743-3
	Provenance, tectonic setting, and source area palaeoweathering of the Lower Cretaceous Nubian sandstones at Gebel Duwi, Eastern Desert, Egypt: inferences from mineralogy and whole-rock geochemistry
	Sallam, Emad S.; Ruban, Dmitry A.
通讯作者	Sallam, ES (corresponding author), Benha Univ, Dept Geol, Fac Sci, Farid Nada St 15, Banha 13518, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:22
英文摘要	The Lower Cretaceous Nubian sandstones cover large areas in both NE Africa and Arabia. In this study, we utilized major and trace element data in combination with petrographic and heavy mineral analyses to infer the provenance model of the Nubian sandstones exposed at Gebel Duwi in the Eastern Desert of Egypt. It is established that these sandstones are mainly quartzose (quartz-arenite) and litho-quartzose deposited in fluvial and estuarine near-shore environments. The quartzose sandstones are dominantly fine to medium-grained in texture. The framework consists mainly of quartz grains (average 92.26% of rock volume), in addition to minor lithic fragments (average 4.6%), very rare feldspars (average 1.17%), and heavy mineral fractions (average 1.8%). The lithic fragments are represented mainly by siltstone and sandy siltstone, with minor lithics of gneisses. The heavy mineral assemblage comprises zircon, tourmaline, rutile (ZTR), garnet, and kyanite, with minor epidote, ilmenite, and leucoxene. Chemically, these sandstones are rich in SiO2 and poor in CaO, MgO, K2O, Na2O, and P2O5. From trace elements, the most abundant are Ba, Th, Zr, and Sr. The provenance-related interpretations of the established rock composition imply that the Nubian sandstones were sourced mainly from a relatively proximal Paleozoic sandstones through multiple stages of fluvial recycling and were deposited in low-lying basin areas in the passive continental margin. The modal composition analysis reflects that these sandstones are mainly of cratonic interior. The ZTR-dominated heavy mineral assemblage indicates an increasing proportion of detritus recycled from older siliciclastic units of Paleozoic age. The high chemical weathering indices indicate intense subaerial weathering in a humid environment and multiple episodes of reworking, with a considerable contribution of basement denudation. A stable tectonic regime is interpreted, and intracratonic activation is not recognized.
英文关键词	Provenance Tectonic setting Palaeoweathering Nubian sandstones NE Africa
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000717607600005
WOS关键词	SEQUENCE STRATIGRAPHY ; SILICICLASTIC SEDIMENTS ; PLATE-TECTONICS ; SHABRAWET AREA ; PETROGRAPHY ; NORTHERN ; AFRICA ; SAND ; SUCCESSION ; EVOLUTION
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/2XILL650/368183
作者单位	[Sallam, Emad S.] Benha Univ, Dept Geol, Fac Sci, Farid Nada St 15, Banha 13518, Egypt; [Ruban, Dmitry A.] KG Razumovsky Moscow State Univ Technol & Managem, First Cossack Univ, Zemlyanoy Val St 73, Moscow 109004, Russia
推荐引用方式 GB/T 7714	Sallam, Emad S.,Ruban, Dmitry A.. Provenance, tectonic setting, and source area palaeoweathering of the Lower Cretaceous Nubian sandstones at Gebel Duwi, Eastern Desert, Egypt: inferences from mineralogy and whole-rock geochemistry[J],2021,14(22).
APA	Sallam, Emad S.,&Ruban, Dmitry A..(2021).Provenance, tectonic setting, and source area palaeoweathering of the Lower Cretaceous Nubian sandstones at Gebel Duwi, Eastern Desert, Egypt: inferences from mineralogy and whole-rock geochemistry.ARABIAN JOURNAL OF GEOSCIENCES,14(22).
MLA	Sallam, Emad S.,et al."Provenance, tectonic setting, and source area palaeoweathering of the Lower Cretaceous Nubian sandstones at Gebel Duwi, Eastern Desert, Egypt: inferences from mineralogy and whole-rock geochemistry".ARABIAN JOURNAL OF GEOSCIENCES 14.22(2021).