干旱区生态环境知识资源中心(Arid): Geochemistry and mineralogy of the shallow subsurface Red Sea coastal sediments, Rabigh, Saudi Arabia: provenance and paleoenvironmental implications

Arid

DOI	10.3906/yer-1904-25
	Geochemistry and mineralogy of the shallow subsurface Red Sea coastal sediments, Rabigh, Saudi Arabia: provenance and paleoenvironmental implications
	Haredy, Rabea 1; Ghandour, Ibrahim 1,2
通讯作者	Ghandour, Ibrahim
来源期刊	TURKISH JOURNAL OF EARTH SCIENCES
ISSN	1300-0985
出版年	2020
卷号	29 期号:2 页码:257-279
英文摘要	Mineralogical and geochemical characteristics of the shallow subsurface sediments retrieved from a short sediment core (2.05 m long) collected from the tidal flat south of Al-Kharrar Lagoon, Rabigh area, Saudi Arabia, are presented to determine the impact of temporal change of depositional environment and distinguish the principal control(s) on their chemical composition. The sediments are dominantly siliciclastic, consisting of two vertically stacked sedimentary fades: lagoonal (LG) gray silt-rich mud to argillaceous very fine sand at the base and intertidal flat (TF) brown mud and argillaceous very fine-grained sands at the top. The sediments of the two facies are similar in their mineralogical and chemical composition except for slight vertical variations in the relative abundance of minerals and concentrations of major oxides and trace elements. The mineralogical composition is dominated by quartz, feldspars, and plagioclase with less abundant clay minerals and hornblende, all of detrital origin. In addition, traces of high and low Mg-calcite, dolomite, and gypsum were recognized. Geochemically, the sediments are first-cycle and compositionally immature. The Al2O3/TiO2 ratios range from 9.4 to 17 and from 13 to 15.4 for the sediments of the LG and TF facies, respectively. These values suggest an intermediate igneous source rock of the Birak group that belongs to the oceanic island arc of the Hijaz Terrane, western Arabian Shield. The average values of paleoweathering indices CIA, CIW, and PIA are <50, suggesting unweathered to poorly weathered source rock that is consistent with the late Holocene arid climate. Although the redox-sensitive V and Cr in the sediments of LG facies are slightly enriched relative to the average shale, the values of the V/Cr ratio are generally <2, suggesting deposition under oxic conditions. The chemical characteristics of the sediments are primarily controlled by the composition of source rock and to a lesser extent by hydraulic sorting during transportation and deposition.
英文关键词	Sediment geochemistry paleoweathering hydraulic sorting Hijaz Terrane Red Sea coastal plain
类型	Article
语种	英语
国家	Saudi Arabia ; Egypt
开放获取类型	Bronze, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000508872500003
WOS关键词	AL-KHARRAR LAGOON ; DEPOSITIONAL ENVIRONMENT ; PALEOREDOX INDICATORS ; HOLOCENE SEDIMENTS ; SURFACE SEDIMENTS ; BASIN ; SOUTH ; EVOLUTION ; MARINE ; SHALES
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312131
作者单位	1.King Abdulaziz Univ, Fac Marine Sci, Dept Marine Geol, Jeddah, Saudi Arabia; 2.Tanta Univ, Fac Sci, Dept Geol, Tanta, Egypt
推荐引用方式 GB/T 7714	Haredy, Rabea,Ghandour, Ibrahim. Geochemistry and mineralogy of the shallow subsurface Red Sea coastal sediments, Rabigh, Saudi Arabia: provenance and paleoenvironmental implications[J],2020,29(2):257-279.
APA	Haredy, Rabea,&Ghandour, Ibrahim.(2020).Geochemistry and mineralogy of the shallow subsurface Red Sea coastal sediments, Rabigh, Saudi Arabia: provenance and paleoenvironmental implications.TURKISH JOURNAL OF EARTH SCIENCES,29(2),257-279.
MLA	Haredy, Rabea,et al."Geochemistry and mineralogy of the shallow subsurface Red Sea coastal sediments, Rabigh, Saudi Arabia: provenance and paleoenvironmental implications".TURKISH JOURNAL OF EARTH SCIENCES 29.2(2020):257-279.