Arid
DOI10.1144/1467-7873/10-MINDEP-056
Petrological and geochemical characteristics of Egyptian banded iron formations: review and new data from Wadi Kareim
Khalil, K. I.2; El-Shazly, A. K.1
通讯作者El-Shazly, A. K.
来源期刊GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS
ISSN1467-7873
出版年2012
卷号12期号:2页码:105-125
英文摘要

The banded iron formations in the eastern desert of Egypt are small, deformed, bodies intercalated with metamorphosed Neoproterozoic volcaniclastic rocks. Although the 13 banded iron deposits have their own mineralogical, chemical, and textural characteristics, they have many similarities, the most notable of which are the lack of sulphide and paucity of carbonate facies minerals, a higher abundance of magnetite over hematite in the oxide facies, and a well-developed banding/lamination. Compared to Algoma, Superior, and Rapitan type banded iron ores, the Egyptian deposits have very high Fe/Si ratios, high Al2O3 content, and HREE-enriched patterns. The absence of wave-generated structures in most of the Egyptian deposits indicates sub-aqueous precipitation below wave base, whereas their intercalation with poorly sorted volcaniclastic rocks with angular clasts suggests a depositional environment proximal to epiclastic influx. The Egyptian deposits likely formed in small fore-arc and back-arc basins through the precipitation of Fe silicate gels under slightly euxinic conditions. Iron and silica were supplied through submarine hydrothermal vents, whereas the low oxidation states were likely maintained in these basins through inhibition of growth of photosynthetic organisms. Diagenetic changes formed magnetite, quartz and other silicates from the precipitated gels. During the Pan-African orogeny, the ore bodies were deformed, metamorphosed, and accreted to the African continent. Localized hydrothermal activity increased Fe/Si ratios.


英文关键词banded iron formations Central Desert of Egypt Neoproterozoic island arcs magnetite hematite
类型Article
语种英语
国家USA ; Egypt
收录类别SCI-E
WOS记录号WOS:000307119000003
WOS关键词WESTERN-AUSTRALIA ; EASTERN-DESERT ; HAMERSLEY GROUP ; ORIGIN ; EVOLUTION ; COMPLEX ; GENESIS ; EARTH ; SEDIMENTOLOGY ; METAMORPHISM
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172491
作者单位1.Marshall Univ, Dept Geol, Huntington, WV 25755 USA;
2.Univ Alexandria, Fac Sci, Dept Geol, Alexandria, Egypt
推荐引用方式
GB/T 7714
Khalil, K. I.,El-Shazly, A. K.. Petrological and geochemical characteristics of Egyptian banded iron formations: review and new data from Wadi Kareim[J],2012,12(2):105-125.
APA Khalil, K. I.,&El-Shazly, A. K..(2012).Petrological and geochemical characteristics of Egyptian banded iron formations: review and new data from Wadi Kareim.GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS,12(2),105-125.
MLA Khalil, K. I.,et al."Petrological and geochemical characteristics of Egyptian banded iron formations: review and new data from Wadi Kareim".GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS 12.2(2012):105-125.
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