Abstract
The qualitative interpretation of anomalies of the gravity and the magnetic fields at the west of Tikrit City and surroundings, Iraq, was carried out. According to the tectonic framework of Iraq, the study area is classified as a part of the stable shelf unit. The polynomial technique was employed to separate the residual-regional anomalies as a first step in the qualitative interpretation. Bouguer gravity anomaly map did not exhibit any clear closures. The magnetic maps showed remarkable high closure in the central eastern part of the study area. The regional gravity and magnetic fields values decline towards the eastern parts of the maps (Mesopotamian Basin) in consistent with the increase in the sedimentary cover (basement depth). The residual gravity and magnetic maps displayed several positive and negative closures. The gravity and magnetic lineaments were depicted and superimposed on the tectonic map of the study area. The rose diagram showed that the dominant orientation of the gravity and magnetic lineaments was toward NE-SW.
Highlights
Gravity and magnetic methods are effectively used in basic geological, geothermal studies and engineering applications [1]
The rose diagrams showed that the trend of majority of gravity and magnetic lineaments is toward NE-SW
According to the results of the current study, we drew up the following conclusions: 1) The little relative simplicity of the Bouguer anomaly map may be controlled by stability of the study area
Summary
Gravity and magnetic methods are effectively used in basic geological, geothermal studies and engineering applications [1]. Qualitative interpretation of gravity anomalies may be accomplished by analogy to mathematical or experimental surveys over known structures [3]. In some instances, it may be considered as diagnostic. In the qualitative interpretation of gravity and magnetic maps, geophysicists are usually interesting in linear anomalies (Lineaments) as indicator of subsurface faults, contacts, and other tectonic features. The findings of the present study contribute to obtaining information on the subsurface geology and evaluating its tectonics. It emphasizes the importance of qualitative interpretation of Bouguer gravity and magnetic anomalies in determining the structural and/or lithological features that cause those anomalies
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