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Evidence of an authigenic origin for palygorskite in a Middle Eocene carbonate sequence from North Qatar.
(
Qatar University
, 1997 , Article)
The "Simisma Member" from the Ras Laffan area in North Qatar is mainly composed of dolomites of shallow marine
origin. Clay minerals contained in the dolomite (average 4%) are mainly palygorskites. There is no indication ...
Mineralogical and Geochemical Compositions of Modern Bivalve Shells from The Mediterranean Coast Of Egypt
(
Qatar University
, 1993 , Article)
The stable isotopic (8 ^C and 8^O) and elemental (Sr and Mg) compositions are presented for marine mollusc Carditacea and Solenacea shells collected off the Mediterranean coast of Egypt. Based on shell microstructures and ...
Stable isotopic composition, stoicometry and origin of Siliceous dolomite of naqb siwa member Bahariya oasis, Egypt
(
Qatar University
, 1994 , Article)
The Lower Campanian Naqb Siwa member exposed near Bahariya Oasis, Egypt, is a shoal ing-upward dolomite sequence that hosts chert nodules and lenses and cavity fillings of quartz and calcite. Dolomite is dominantly replacive, ...
Petrographic And Chemical Microheterogeneity In Dolomite, Bahariya Oasis, Egypt
(
Qatar University
, 1994 , Article)
Dolomite samples from the lower member of the El-Hafhuf Formation (Turonian-Santonian) possess noticeable petrographic and chemical heterogeneity among their fabric components. Petrographically, the study samples can be ...
Diagenesis of the middle eocene "nummulite bank" of The giza pyramids plateau, Egypt: petrologic and 18o/16o evidence
(
Qatar University
, 1994 , Article)
The Middle Eocene "nummulite bank" of the Giza Pyramids Plateau has been extensively altered diagenetically. The result of a study involving petrography, cathodoluminescence, and 18O/160 and 13C/12C data, provide information ...
Mineralogical And Geochemical Evaluation Of Upper Cretaceous Black Shales, Safaga District, Egypt.
(
Qatar University
, 1995 , Article)
Lithologic and compositional properties of black shale and pyrite from the Upper Cretaceous phosphorite/black shale deposits (Duwi Formation) of Eastern Desert of Egypt indicate similarity in mineralogy, geochemical ...
Diagenetic Trends In The Pleistocene Calcareous Ridges, Mersa Matruh Area, Egypt
(
Qatar University
, 1993 , Article)
Ooids are a major constituent of the Pleistocene carbonates along the northwestern coastal ridges of Egypt. For a detailed diagenetic study of the rocks, the Mersa Matruh area was selected. Petrographic examination shows ...