تشخيص و تركيز الفلدسبار في بعض الترسبات الرملية، جنوبي العراق

الملخص EN

Sand deposits bearing feldspar at Dibdiba formation were studied in eight exposed sections within Safwan and Zubair area in Basrah region, southern Iraq.

distribution of feldspar minerals were evaluated in different sand size fractions (0.125-0.25mm), (0.25-0.5mm), (0.5-1mm), (1-2mm) in order to upgrade their contents of feldspar and the possibility to be used as raw material for glass and ceramic industry in Iraq.

Coarse and very coarse size fractions (0.5-2mm) make up (56%) and (38%) in Safwan and Zubair area respectively.

Mineralogical and petrogrphical analysis revealed the predominant of quartz in fine and medium sizes of both mono and polycrystalline (74.7%, 86.2%) in Safwan and Zubair area respectively, while feldspar particularly potash feldspar (Orthoclase, Microcline and Perthetic microcline) are maily concentrated in coarse to very coarse sizes especially in Safwan area (15.1%) in comparison with their average content in Zubair area (6.8%).

Chemically (Al2O3, Na2O, K2O) were concentrated in coarse to very coarse sand sizes (0.5- 2mm) with average content of (Na2O + K2O) (4.19%) in Safwan area and (3.4%) in Zubair area.

The concentration of (SiO2, Fe2O3, CaO and SO3) tend to decrease with the increase of sand sizes in both area and especially concentrated in fine and medium sizes.

The average concentrations of (Fe2O3) of both Safwan and Zubair reflect the possibility of upgrading of feldspar from sand deposits by using floatation method without magnetic processes.

Feldspar upgrading by dry mechanical processes showed that the range of feldspar (26.7-32.5%) in Safwan and (25.2-29.3%) in Zubair sand deposits, which encourage to consider that the coarse and very coarse sand sizes are raw materials for feldspar in Basrah, southern Iraq.