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Volume :7 Issue : 1 1980      Add To Cart                                                                    Download

Cementation, diagenesis and paragenetic sequence in the Biyadh Wasï Sandstones (Lower-Middle Cretaceous) of central Saudi Arabia

Auther : MOHAMED A. MOSHRIF

Department of Geology, College of Science, University of Riyadh, Riyadh, Saudi Arabia

 

ABSTRACT

 

Although most of the Biyadh-Wasï Sandstones (Lower-Middle Cretaceous) are friable and poorly cemented, few specimens reveal some cementation principally by secondary silica (or quartz), carbonate or ferruginous material. The Biyadh-Wasï Sandstones have undergone several important diagenetic changes during their post-depositional history. The full paragenetic sequence commenced with primary partial silica cementation, which was followed by formation of iron in the remaining pore spaces. Both stages included quartz overgrowths, produced as a result of pressure solution. Later stages resulted in precipitation of Fe-rich clays and carbonate in new pore spaces created by partial replacement and corrosion of detrital quartz grains. The lack of quartz overgrowths In the later stages is believed to be due to inhibition of pressure solution. The final diagenetic stages include weathering, which has created new pore spaces, and precipitation of silica dust (probably of aeolian origin) in such pores which resulted in the formation of secondary silica overgrowths in the form of microcrystalline quartz. This process gives rise to the quartzitic crusts typically developed on many elevated outcrops of the Biyadh and Wasï Sandstones

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