Palaeoenvironment and Diagenesis of Middle Jurassic Athleta Sandstone, Jhurio Dome, Kachchh, Gujarat

The Middle Jurassic Athleta Sandstone of Jhurio Dome is mainly medium grained, moderately sorted to moderately well sorted, subarkose and is composed of four major lithofacies representing near shore tidal environments. Iron oxide, silica and glauconite cements mark the sandstones. Compaction is mainly mechanical and sandstones show good amount of porosity. Porosity reduction is mainly due to mechanical compaction in the early stage of diagenesis and subsequent pervasive iron oxide cementation.