دراسة بعض الخصائص المعدنية لمفصول الرمل الناعم في بعض ترب غابات شمالي العراق

الملخص EN

This study has been undertaken to investigate the mineralogical properties and morphological features of very fine sand fraction in some forest soils / northern Iraq .

The morphological features of very fine sand fractions were studied by optical microscope .

Results have shown that the grains of these minerals from individual soil horizons have different colours , those from the surface horizons have dark brownish spots , due to staining by organic matter , those from (B) horizon have a yellowish grey – to yellowish brown spots due to accumulation of Iron oxides , and those from the (C) horizon are grey , similar to the parent rocks .

Results of light minerals indicated that quartz is dominant due to effect of parent material of these soils .

Two types of opaque minerals (black and brown) are found , wheras the brown opaque minerals were dominant in heavy minerals .

Three groups of transparent heavy minerals are found , stable minerals (Pyroxen and Amphibole , metastable minerals) (Epidote and Garnet) , and Ultra stable minerals (Zircon and Tourmaline).