Textural Study and Depositional Environment of Sand Grains from Rocks of Jaisalmer Formation, Jaisalmer District, Rajasthan, India

The textural parameters of sand grains from rocks of Jaisalmer Formation were systematically analysed for reconstruction of the depositional environment. These sands are fine- to medium-grained, moderatety sorted to well sorted, negatively to positivety skewed, and leptokurtic, The variations in mean size, sorting, skewness and kurtosis indicate a change in environmental energy conditions. The environmental interpretations based on various bivariate and multivariate plots of size and shape parameters indicate river transportation of these sands and deposition in a beach- to shallow-marine environment. The surface textures of these sand grains reveal transportation in an aqueous media and deposition in a shallow-marine littoral environment. The subangular to subrounded shape and the presence of abundant feldspars and mica show that these sands are less matured and have undergone little of transportation mostly through saltation process from a nearby source.