Skip to main content

Kaolinite in the Upper Cretaceous-Paleogene sedimentary facies of Bahariya Oasis, Egypt: Nature and origin

Buy Article:

$39.00 plus tax (Refund Policy)

Abstract:

Kaolinites in the sedimentary facies of Bahariya Oasis, Egypt were found in four formations; the Cenomanian clastics of the Bahariya Formation, the Eocene iron ore of the Naqb-Qazzun Formation, the late Lutetian – Bartonian glauconites of the Hamra Formation and the conglomerates and sandstones of the Oligocene Qatrani Formation. Kaolinites occur as beds, bands, lenses or pockets of white to gray deposits either as single phase or mixed with other clay minerals such as smectite, glauconite and halloysite. Based on their genesis the kaolinites were subdivided into authigenic and detrital kaolinites. Authigenic kaolinites occur as well-developed stacked hexagonal and book-like flakes in the sandstones of Bahariya and Qatrani Formations and rosette-like shaped in the halloysite pockets inside the iron ore of the Naqb-Qazzun Formation. These kaolinites were formed as a result of alteration of Al-rich minerals such as feldspars and glauconite. Detrital kaolinites occur as undefined, deformed and crumbled flakes in the kaolinite beds of the Hamra Formation. They were formed as a result of tropical weathering of pre-existing Al-rich rocks such as the crystalline igneous rocks that are situated south and southeast of the studied localities reflecting prevailing tropical conditions during that time.

Keywords: AUTHIGENIC; BAHARIYA OASIS; DETRITAL; EGYPT; KAOLINITE

Document Type: Research Article

DOI: https://doi.org/10.1127/0077-7749/2009/0253-0313

Publication date: 2009-08-01

More about this publication?
  • Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more