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Article
Geochemistry of Marl Sediments within Fat'ha Formation at Selected Localities, Northern Iraq
جيوكيميائية رواسب المارل ضمن تكوين فتحة في مناطق مختارة، شمالي العراق

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Abstract

A total number of (32) marl samples of Fat'ha Formation (Middle Miocene) was collected from four selected localities in northern Iraq. Geochemical study included the analysis of (13) major and minor oxides by x-ray fluorescence and wet chemical methods and (7) trace elements by (XRF). The study shows that the oxides (SiO2, Al2O3, TiO2, Fe2O3, FeO, most MgO, Na2O, K2O, MnO, P2O5 and H2O+) are in the detrital fraction which comprises around (58%) of total mineral phases. These are clay minerals (39%), quartz (15%), iron oxides and Ti-minerals (3%) and feldspar (1%). The oxides (CaO, some MgO and CO2) comprise the chemical fraction, the carbonates (~ 42%). The trace elements (Co, Ni, Ga, Rb, Zr and some Sr) are within the detrital fraction, mainly the clay minerals and iron oxides. The elements (Ba and the remaining Sr) are within the carbonate fraction. The oxides and elements of the detrital fraction, in general, have a negative correlation with oxides and elements of the chemical fraction. The red colour of marl sediments is primary caused by the red pigment of haematite. The green colour is secondary and resulted from the reducing environments, initiated by the presence of organic matter.

تم جمع (32) نموذجا من مارل تكوين فتحة (المايوسين الاوسط) من اربعة مناطق مختارة في شمالي العراق. تضمنت الدراسة الجيوكيميائية تحليل (13) اوكسيدا رئيسا بواسطة جهاز الاشعة السينية الوميضية (XRF) والطرق الرطبة وكذلك تحليل (7) عناصر اثرية بواسطة (XRF). وأوضحت الدراسة بأن الاكاسيد (SiO2 و Al2O3 و TiO2 و Fe2O3 و FeO ومعظم MgO وNa2O و K2O و MnO و P2O5


Article
Concentrations of Trace Metals in Aquatic Plants and sediments of the Southern Marshes of Iraq (Al-Hawizah and Al-Hammar)

Author: N.A.N. Awad ; H.T. Abdulsahib andA.A. Jaleel
Journal: Marsh Bulletin مجلة الاهوار ISSN: 18169848 Year: 2008 Volume: 3 Issue: 1 Pages: 57-66
Publisher: Basrah University جامعة البصرة

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Abstract

The analysis of trace metals Cd, Pb, Cu, Zn, Mn and Fe in six species of aquatic plant species and sediments of Al-Hawizah and Al-Hammar marshes were investigated . It was found that the nature of the region is unpolluted with the trace metals. The ability of these plants to accumulate and eliminate trace metals in relation to their concentrations in ambient led to the observed variations in metal concentrations in plants. The results showed higher concentration of trace metals in sediment than in plants. No significant difference were observed in trace metals concentrations in aquatic plants and sediment samples for both Al-Hawizah and Al- Hammar marshes .Generally , the levels of the studied metals in plants and sediments of region were lower thanthe other compared areas of the world

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