Sedimentary and mineralogical study of concreations structure in Jabil sanam, southern Iraq

Abstract

Seven sections of different types of concretions were studied mineralogical by using X.R.D. , and petrographical in thin section for seven selected sample . The mineralogical and petrographical studies where showed the siliceous, carbonate, and dolomitic of concretions’ in layer of limestone and marl , in edition lime-siliceous spherical structure in layer of limesandston. Three types of concretions were distinguished :spherical lime concretion which contain foraminifera as sptaria form , rounded shape of dolomitic concretion , silicate noudle (chert) and geode. The origin of concretion were barial processes , replacing and growth mineral around foraminifera and algae.