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Geochemistry and Depositional Environments of the Tertiary Clays in Makkah and Rabigh Quadrangles, West Central Arabian Shield, Saudi Arabia

2004 Journal of King Abdulaziz University-Earth Sciences  
The present work deals with a detailed chemical study on the clay mineral assemblages characterizing some clay deposits, shales and mudstones, which differ in their texture, colour, lithology, and depositional environments. Samples selected from seven Tertiary formations located in Makkah and Rabigh quadrangles are chemically analyzed; some are used as environmental discriminators. The distribution of major and some trace elements in 77 samples has been investigated and the results obtained
more » ... esults obtained were tabulated and graphically illustrated. A wide range of variation is shown in the results of both major and trace constituents. This is due to their variable content of clay mineral constituents and the abundance or paucity of other admixtures, e.g. quartz, feldspar and minor heavy mineral grains. The local occurrence of minor gypsum and carbonate veinlets in some formations and ferrugination in others are also effective.
doi:10.4197/ear.15-1.4 fatcat:phplk5afondyte7nu4jng2heke