Grain size, sorting and matrix as indicators of energy of depositional environment of Tanuma formation east of Baghdad

Abstract

Sorting, groundmass and roundness degree is used as an indicators that referred to depositional
environment energy for the formation of Tanuma through checking (90) thin sections of rocks samples
collected in the studied area in the east of Baghdad. Results revealed that Tanuma formation was divided
into three energy water areas and this has been shown through energy curves which in turn depends on
grain size, sorting and groundmass. The formation located in low energy curves. In words, it located in
quiet deep water. Basically, the formation consisted of limestone with groundmass of micrit.