• Home
  • Browse
    • Current Issue
    • By Issue
    • By Author
    • By Subject
    • Author Index
    • Keyword Index
  • Journal Info
    • About Journal
    • Aims and Scope
    • Editorial Board
    • Publication Ethics
    • Peer Review Process
  • Guide for Authors
  • Submit Manuscript
  • Reviewers
  • Contact Us
 
  • Login
  • Register
Home Articles List Article Information
  • Save Records
  • |
  • Printable Version
  • |
  • Recommend
  • |
  • How to cite Export to
    RIS EndNote BibTeX APA MLA Harvard Vancouver
  • |
  • Share Share
    CiteULike Mendeley Facebook Google LinkedIn Twitter
Al-Azhar Bulletin of Science
arrow Articles in Press
arrow Current Issue
Journal Archive
Volume Volume 32 (2021)
Volume Volume 31 (2020)
Volume Volume 30 (2019)
Volume Volume 29 (2018)
Volume Volume 28 (2017)
Volume Volume 27 (2016)
Volume Volume 26 (2015)
Issue Issue 2-A
Issue Issue 2-B
Issue Issue 2-C
Issue Issue 2-D
Issue Issue 1-A
Issue Issue 1-B
Issue Issue 1-D
Volume Volume 25 (2014)
Volume Volume 24 (2013)
Volume Volume 23 (2012)
Volume Volume 22 (2011)
Volume Volume 21 (2010)
Volume Volume 20 (2009)
Volume Volume 19 (2008)
Volume Volume 18 (2007)
Volume Volume 17 (2006)
Volume Volume 16 (2005)
ELSHAHAT, O. (2015). SEDIMENTOLOGICAL, PETROGRAPHICALAND GEOCHEMICAL CHARACTERIZATION OF THE OLIGOCENE “GABALAHMAR FORMATION” AT MAADI-QATTAMIYA AREA, EGYPT. Al-Azhar Bulletin of Science, 26(Issue 2-D), 61-84. doi: 10.21608/absb.2015.22624
O.R. ELSHAHAT. "SEDIMENTOLOGICAL, PETROGRAPHICALAND GEOCHEMICAL CHARACTERIZATION OF THE OLIGOCENE “GABALAHMAR FORMATION” AT MAADI-QATTAMIYA AREA, EGYPT". Al-Azhar Bulletin of Science, 26, Issue 2-D, 2015, 61-84. doi: 10.21608/absb.2015.22624
ELSHAHAT, O. (2015). 'SEDIMENTOLOGICAL, PETROGRAPHICALAND GEOCHEMICAL CHARACTERIZATION OF THE OLIGOCENE “GABALAHMAR FORMATION” AT MAADI-QATTAMIYA AREA, EGYPT', Al-Azhar Bulletin of Science, 26(Issue 2-D), pp. 61-84. doi: 10.21608/absb.2015.22624
ELSHAHAT, O. SEDIMENTOLOGICAL, PETROGRAPHICALAND GEOCHEMICAL CHARACTERIZATION OF THE OLIGOCENE “GABALAHMAR FORMATION” AT MAADI-QATTAMIYA AREA, EGYPT. Al-Azhar Bulletin of Science, 2015; 26(Issue 2-D): 61-84. doi: 10.21608/absb.2015.22624

SEDIMENTOLOGICAL, PETROGRAPHICALAND GEOCHEMICAL CHARACTERIZATION OF THE OLIGOCENE “GABALAHMAR FORMATION” AT MAADI-QATTAMIYA AREA, EGYPT

Article 5, Volume 26, Issue 2-D, December 2015, Page 61-84  XML PDF (2.18 MB)
Document Type: Original Article
DOI: 10.21608/absb.2015.22624
Author
O.R. ELSHAHAT*
Geology Department, Faculty of Science, Al-Azhar University
Abstract
An integrated mechanical, mineralogical, petrographical and geochemical studies were carried out on the sand and sand- stone samples from the Gabal Ahmar Formation in Maadi- El Qattamiya area. Twenty-nine samples were collected from two sections. Grain size analysis of the studied sediment has been carried to evaluate its textural parameters and statistical mea- sures to depict the depositional pattern of sediments in the study area.
The samples are medium to very coarse-grained (1.007 to -0.54 φ), poorly to very well-sorted (-0.040 to 1.32φ), very fine to coarse skewed (-0.11 to 1.72φ) and mesokurtic to very leptokurtic (-1.59-2.82φ) in nature. The grain size distribution reveals that the transporting medium must have undergone series of rise and fall in its velocity. The studied samples could be classified into three types gravelly and slightly gravel sand, gravel and sand class.
Petrographically, the Gabal Ahmar sandstones are mainly ferruginous arenite, ferruginous and calcareous greywackes, generally, moderately/poorly sorted, sub-angular, sub-rounded with silica, carbonate and sericite cement. The main mineral- ogical constituents are quartz, montmorillonite, calcite, microcline and hematite. The detected heavy minerals are magnetite, hematite, limonite, zircon, and glauconite. All the identified grains of heavy minerals show different shapes.
The geochemistry of the studied sandstones supports the petrographic results. The sandstone is therefore highly siliceous, with exception of three calcareous sandstone samples which recorded a major amount of CaO up to 30.35%. The Gabal Ahmar sandstones can be classified chemically into arenite and greywacke.
Keywords
Grain size analysis; Depositional Environment; Heavy minerals; geochemical analysis; Gabal Ahmar Formation
Main Subjects
Geology
Statistics
Article View: 109
PDF Download: 220
Home | Glossary | News | Aims and Scope | Sitemap
Top Top

Journal Management System. Designed by NotionWave.