New discovery of olivine pyroxene-rich sandstones in the kolosh formation, Dyana area, ne Iraq : an approach to provenance and tectonics of the sedimentary basin

Abstract EN

These mineralogical assemblages refer to ultrabasic and basic plutonic igneous sources associated with basic volcanic rocks.

the ultrabasic and basic source is suggested to derived from mantle and oceanic crust origin, represented by the ophiolite sequence of hasan beg, rayat, choman and galalah areas.

these ophiolites were thrusted and emplaced during late cretaceous and were associated with volcanic island arc.

the thrusted ophiolites were subjected to rapid submarine erosion and deposition and/ or subjected to subaerial erosion.

Intense wave action accelerated erosion of beach rocks, removing the light fraction and leaving the heavy minerals insitue.

Intense tectonism slumped these sediments into deeper margins by the turbidity currents.