Abstract

• The present study mainly focuses on the Geochemistry of Clastic sedimentary rock mainly on the sandstones of Paleocene. Paunggyi Formation exposed in the northernmost part of the Minbu Basin, Tilin, Magway region. The study attempts to constrain their source rocks, palaeo-weathering and tectonic setting of the provenance. The study area mainly consists of Tertiary Clastic Sedimentary rocks. Selected samples from the research area were analyzed using X-ray Fluoresence (XRF) for major oxides and some trace elements to know the chemical composition of sandstone and to classify the sandstone. Lithologically, the Paunggyi Formation is mainly composed of buff to grey, medium bedded sandstone, compact to friable thick bedded to massive gritty sandstone and conglomerate. By the XRF analysis, sandstones of the Paunggyi Formation fell within the litharenite zone. The analysis also points out that most of the sandstones are Fe-sand composition. By the discriminant diagram the Paunggyi sandstones samples indicating the mafic igneous and intermediate igneous provenances. Moreover, sandstones of the Paunggyi Formation were deposited in the active continental margin shifted to the downward of the oceanic island arc field. Additionally, the average CIA and CIW values of Paunggyi sandstones indicate very low degree of chemical weathering might have taken place in the source area.