Mineralogical and Geochemical Investigation of the Tiyon Formation from Surjan Anticline, Thano Bula Khan, District Dadu, Sindh
Abstract
Twenty samples of the Tiyon Formation from Thano Bula Khan, District, Dadu Sindh, have been investigated with the aim to know the mineralogical composition of the whole-rock and clay fraction (<2g) samples and also to have some insight regarding the origin of minerals and the environments of the deposition of the studied sediments.
The whole-rock samples are composed of detrital components e.g. quartz, kaolinite, vermiculite, mica-montmorillonite. Calcite is the only non-detrital mineral. The clay fraction is composed of Mg-vermiculite, mica-montmorillonite and kaolinite. The Mg-vermiculite is the major constituent in association with kaolinite, illite and mica-montmorillonite in the clay fraction samples.
Vermiculite seems to have been produced by the degradation of sheet silicates e.g. illite, cholorite, biotite, mica-montmorillonite, either in the locality of the provinance or in the basin of the deposition at Thano Bula Khan.
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