Abstract

• The present study mainly focuses on the Geochemistry of Clastic sedimentary rock mainly on the sandstones of Early Eocence Laungshe Formation exposed in the northernmost part of the Minbu Basin, Tilin, Magwe 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 Laungshe Formation is mainly composed of thinly laminated dark grey to bluish grey shale intercalated with thin to mediumbedded sandstones. By the XRF analysis, sandstones of the Laungshe 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 Laungshe sandstones samples indicating the mafic igneous provenance. Moreover, sandstones of The Laungshe 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 Laungshe sandstones indicate extreme degree of chemical weathering might have taken place in the source area.