Arid
DOI10.1002/gj.3094
Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering
Fathy, Douaa1,2; Wagreich, Michael1; Zaki, Rafat2; Mohamed, Ramadan S. A.2; Gier, Susanne1
通讯作者Fathy, Douaa
来源期刊GEOLOGICAL JOURNAL
ISSN0072-1050
EISSN1099-1034
出版年2018
卷号53期号:6页码:2597-2612
英文摘要

Upper Cretaceous oil shales accumulated in intracratonic sedimentary basins along the Central Eastern Desert. Comprehensive geochemical analyses have been applied on 3 Maastrichtian oil shale horizons from the Duwi and Dakhla formations (El-Beida and El-Nakheil mines). We provide significant clues for chemical weathering, sediment recycling, petrogenesis, and tectonic setting of oil shales’ source material. The mineralogical composition of the studied oil shales is generally characterized by carbonates, phyllosilicates, quartz, fluorapatite, and sulphides. The geochemistry is characterized by high Ca, P, Ni, U, and Cr values compared to standard post-Archean Australian shales (PAAS). Their chondrite-normalized patterns are distinguished by LREE enrichment, HREE depletion, negative Eu anomaly, and typical shale-like PAAS-normalized REE patterns. Furthermore, the total REE content is positively correlated with Si, K, Na, Fe, Al, Ti, and Mn, indicating that the REE of the investigated oil shales originated from terrigenous sources. Diverse proxies (e.g., CIA, CPA, and PIA) and the A-CN-K ternary diagram suppose that the source rock succession of the oil shales experienced moderate to intensive chemical weathering. Various geochemical parameters suggest that the oil shales were predominately derived from intermediate, with a minor contribution from felsic, igneous source rocks without any remarkable recycling signals. The average values of (Gd/Yb)(N) (1.39), Eu/Eu* (0.76), Th/U (0.29), and discrimination diagrams reveal that the oil shales were derived from Neoproterozoic island arc parent rocks. The geochemical results for oil shale provenance are in accordance with the composition and the palaeotectonic history of the igneous rocks in the Central Eastern Desert of Egypt.


英文关键词chemical weathering Egypt Maastrichtian oil shale provenance recycling tectonic setting
类型Article
语种英语
国家Austria ; Egypt
收录类别SCI-E
WOS记录号WOS:000450653800012
WOS关键词FINE-GRAINED SEDIMENTS ; ELEMENT GEOCHEMISTRY ; TRACE-ELEMENTS ; RARE-EARTH ; ROCKS ; BASIN ; SANDSTONES ; GRAYWACKES ; MUDSTONE ; PROVINCE
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/2XILL650/209624
作者单位1.Univ Vienna, Dept Geodynam & Sedimentol, Althanstr 14, A-1090 Vienna, Austria;
2.Menia Univ, Dept Geol, Al Minya, Egypt
推荐引用方式
GB/T 7714
Fathy, Douaa,Wagreich, Michael,Zaki, Rafat,et al. Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering[J],2018,53(6):2597-2612.
APA Fathy, Douaa,Wagreich, Michael,Zaki, Rafat,Mohamed, Ramadan S. A.,&Gier, Susanne.(2018).Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering.GEOLOGICAL JOURNAL,53(6),2597-2612.
MLA Fathy, Douaa,et al."Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering".GEOLOGICAL JOURNAL 53.6(2018):2597-2612.
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