Arid
DOI10.1002/gj.3025
Petrography and geochemistry of the Lower Miocene Moghra sandstones, Qattara Depression, north Western Desert, Egypt
Tawfik, Hossam A.1,2; Salah, Mohamed K.3; Maejima, Wataru1; Armstrong-Altrin, John S.4; Abdel-Hameed, Abdel-Monem T.2; El Ghandour, Mai M.2
通讯作者Tawfik, Hossam A.
来源期刊GEOLOGICAL JOURNAL
ISSN0072-1050
EISSN1099-1034
出版年2018
卷号53期号:5页码:1938-1953
英文摘要

The petrographic and geochemical compositions of the Lower Miocene Moghra siliciclastic sediments in the Qattara Depression, north Western Desert, were investigated to infer their provenance, tectonic setting, palaeoweathering conditions, and diagenetic history. The Moghra Formation (similar to 200 m thick) is dominated by sandstones intercalated with mudstone and carbonates. X-ray diffraction analysis revealed that smectite, kaolinite, and illite are the dominant clay minerals found in mudstones. The sandstones are mainly subarkose, sublitharenite, and quartzarenite types with an average modal composition of Q(89)F(6)L(5). The sandstones possess various diagenetic overprints including mechanical infiltration of clay, compaction, cementation, dissolution, and replacement. Major and trace element concentrations suggested that the parent rocks are intermediate to felsic in composition derived from the Neoproterozoic Arabian Nubian Shield. The weathering indices such as the chemical index of alteration and the plagioclase index of alteration implied that the intensity of chemical weathering in the source area was moderate under semi-arid climatic conditions. On the other hand, the index of chemical variability indicates a low compositional maturity. The tectonic discrimination diagrams demonstrated a collision setting for the Arabian Nubian Shield, which represents the main supplier of sediments to the study area. Statistical parameters, sedimentary structures, and ichnofossil contents suggested that the Moghra sediments were deposited in a tidally-influenced fluvial environment.


英文关键词diagenetic evolution Miocene Moghra Formation palaeoweathering provenance Qattara Depression
类型Article
语种英语
国家Japan ; Egypt ; Lebanon ; Mexico
收录类别SCI-E
WOS记录号WOS:000443563400020
WOS关键词GULF-OF-MEXICO ; SEQUENCE STRATIGRAPHIC FRAMEWORK ; PETROHAN TERRIGENOUS GROUP ; SEDIMENTARY-ROCKS ; DIAGENETIC ALTERATIONS ; CHEMICAL-COMPOSITION ; KAHAR FORMATION ; SOUTHERN INDIA ; NW BULGARIA ; PROVENANCE
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构Universidad Nacional Autónoma de México
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/209622
作者单位1.Osaka City Univ, Grad Sch Sci, Dept Geosci, Osaka 5588585, Japan;
2.Tanta Univ, Fac Sci, Dept Geol, Tanta, Egypt;
3.Amer Univ Beirut, Dept Geol, Beirut, Lebanon;
4.Univ Nacl Autonoma Mexico, Inst Ciencias del Mar & Limnol, Unidad Proc Ocean & Costeros, Cdmx, Mexico
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GB/T 7714
Tawfik, Hossam A.,Salah, Mohamed K.,Maejima, Wataru,et al. Petrography and geochemistry of the Lower Miocene Moghra sandstones, Qattara Depression, north Western Desert, Egypt[J]. Universidad Nacional Autónoma de México,2018,53(5):1938-1953.
APA Tawfik, Hossam A.,Salah, Mohamed K.,Maejima, Wataru,Armstrong-Altrin, John S.,Abdel-Hameed, Abdel-Monem T.,&El Ghandour, Mai M..(2018).Petrography and geochemistry of the Lower Miocene Moghra sandstones, Qattara Depression, north Western Desert, Egypt.GEOLOGICAL JOURNAL,53(5),1938-1953.
MLA Tawfik, Hossam A.,et al."Petrography and geochemistry of the Lower Miocene Moghra sandstones, Qattara Depression, north Western Desert, Egypt".GEOLOGICAL JOURNAL 53.5(2018):1938-1953.
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