Geochemical assessment of Naopurdan limestone for cement making - Chwarta area, Kurdistan Region, NE Iraq

Tola A. Mirza , Ibrahim M. J. Mohialdeen , Salim H. Al-Hakarri , and Chro M. Fatah
University of Sulaimani, School of Science, Department of Geology


Abstract

The Naopurdan limestone klippe is covering about 19.28 Km2
of Chwarta area-Sulaimani City. Fifteen samples were collected from this limestone body and analyzed
by X-ray fluorescence technique. The analysis was carried out in Mass Cement
Company. The Petrographical study revealed the presence of different fossil content
such as Nummulitesspp ( N. perforates; N.milliucaput; N.globulosa; N.atacicus;
N.bahyranses)., Alvelinaspp( A. eleptica; A. aragoensis; A. oblonga; A. fusiformis).,
Miliolina ; Algae (Lithothaminum sp.; Cympolina sp. ); echinoid bioclasts; corals; and
Orbitolites; Coskinolinasp; Somalina sp. Index fossils indicate the Middle Eocene age
for this limestone body. The formaniferal wackestone and packstone microfacies are the
most common facies in the studied samples, as well as recrystallized limestone observed
in two samples. The depositional environment as deduced from lithology and fossil
content is shoal marine environment.
Petrological study indicated that the limestone samples are crystalline and dominantly
composed of calcite with CaCO3 content more than 95 %. Geochemical analysis results
of fifteen handpicked samples indicated that the limestone from the Naopurdan
Formation shows LOI range between (38.50% to 43.29%), Si02 (0.11% to 7.92%),
CaO (55.19% to 45.82%), A12O3(0.01% to 0.97%), Fe2O3(0.02 % to .46%) and MgO
0.37 % to 4.29 %,K2O,Na2O, and SO3 are present in traces. The lime saturation
factors (LSF) of studied samples have widely differing values ranging from 188.64 to
7543.52, but most have values above the limits required for high quality cement. Thus a
claystone rocks from Red Bed Series have been added to reach the best point of LSF of
clinker. All materials after mixing proved that they meet the specification required for
clinker production.

Key Words:
Naopurdan, Red Bed
Series, Limestone,
Cement, Lime
saturation factor.

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