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• W2001048892 abstract "The Lower Palæozoic Naqus Formation of Gebel Gunna in the Sinai Peninsula is conformably underlain by the Araba Formation and unconformably overlain by the Cenomanian Malha Formation. It consists mainly of fine- to medium-grained pebbly sandstones with a few siltstone and granulestone interbeds. Petrographical, X-ray diffraction, scanning electron microscope and chemical analyses of the sandstones revealed that they are mainly quartzarenite, containing allogenic and authigenic clays. The allogenic clays were found in small amounts. Such clays exhibit some of the characteristic features of infiltration clay coats. The clays coat a few grain surfaces and form meniscus-shaped pore bridges at points of grain contact. In addition, the clays were observed on the surfaces of crystalline authigenic minerals and in-filled elongated pores of partially dissolved feldspar grains. The recorded authigenic clays are mainly kaolinite with a minor amount of illite. The kaolinite exhibits three morphological habits: vermicular, blocky and fan-shaped. The vermicular kaolinite is dominant and was interpreted to have formed by dissolution of feldspar grains. The blocky kaolinite was observed with a textural relationship, indicating that it was neomorphosed after vermicular kaolinite. The fan-shaped kaolinite was found to be a result of mica alteration. Study of both allogenic and authigenic clays has helped in understanding the sedimentological history of the studied sandstones. The sandstones were deposited in a braided stream, buried at depth of about 1–3 km, and afterwards subjected to surface exposure. La formation paléozoïque inférieure de Naqus du Gebel Gunna dans la Péninsule du Sinaï est surmontée en concordance par la Formation d'Araba et en discordance par la Formation cénomanienne de Malha. Elle consiste principalement en grès conglomératiques finement à moyennement grossier avec quelques intercalation de silt et de roches à granules. La pétrographie, la diffraction des rayons X, le microscope électronique à balayage et les analyses chimiques des grès indiquent qu'il s'agit d'arénites à quartz contenant des argiles allogènes et authigènes. Les argiles allogènes sont présentes en faibles quantités. Elles montrent certains caractères typiques des infiltrations d'enduits argileux. Les agiles tapissent les surfaces de quelques grains et forment des ponts en forme de ménisques dans les pores au contact des grains. De plus, les argiles ont été observées sur les surfaces des minéraux cristallins authigéniques et remplissent des pores allongés dans les grains de feldspath partiellement dissous. Les argiles authigènes observées sont principalement de la kaolinite avec un peu d'illite. La kaolinite présente trois morphologies: vermiculaire, polyédrique et en éventail. La kaolinite vermiculaire domine et a été interprétée comme formée par la dissolution des grains de feldspath. Les relations texturales indiquent que la kaolinite polyédrique s'est formée après la kaolinite vermiculaire. La kaolinite en éventail est le résultat de l'altération de micas. L'étude des argiles allogènes et authigènes permet de contraindre l'histoire sédimentaire des grès étudiés: ces derniers se sont déposés dans une rivière anastomosée, ont été ensevelis à une profondeur de 1 à 3 km et ensuite ramenés en surface." @default.
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• W2001048892 date "2001-01-01" @default.
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• W2001048892 title "Allogenic and authigenic clays of the Lower Palæozoic sandstones of the Naqus Formation at Gebel Gunna, central Sinai, Egypt: their recognition and geological significance" @default.
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• W2001048892 doi "https://doi.org/10.1016/s0899-5362(01)90018-1" @default.
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