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Article
The Transition Tectonic Zone Between the Two Parts of the Platform in Iraq: A Review Study

Authors: Ahmed S. Al-Banna --- Kamal K. Ali
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 2C Pages: 1086-1092
Publisher: Baghdad University جامعة بغداد

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Abstract

The changes of the tectonic boundary locations between the stable and unstable shelf on different version of the tectonic maps of Iraq is discussed. It is found that the location of the boundary varies due to philosophy and the type of the geological parameters. It is used the stratigraphic, geophysical, structural, geochemical, hydrological and others information in delineating the boundary. The deep crustal structures obtained by using gravity data show that the boundary shifted toward the west by about 100 km in southern Iraq. According to the review, and when taking in consideration all the geological and geophysical parameters from the lower crust to the earth surface, it is believed that the boundary is not a line but it is a tectonic crustal zone. This zone represents a transition zone between the main two regions of the platform in Iraq, and it is segmented to many subzones by transverse faults. In addition, it is believed that the data of the parameters of shallow geology confirm the eastern side of the main zone, while the lower crustal structures confirm the western side of the main zone


Article
Tectonic Boundaries and Depth Estimate of Some Gravity Sources in Diyala Area, East Central Iraq

Authors: Alaa N. Daham --- Ahmed S. AL-Banna
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 2 Pages: 308-320
Publisher: Baghdad University جامعة بغداد

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Abstract

The Bouguer gravity and magnetic RTP anomalies data were used to detect the main tectonic boundaries of middle and south of Diyala Province, east Iraq. Window method was used to separate the residual anomalies using different space windows for the Bouguer and Magnetic RTP maps. The residual anomaly processed in order to reduce noise and give a more comprehensive vision about subsurface lineaments structures. Results for descriptive interpretation presented as contour maps in order to locate directions and extensions of lineaments feature which may interpret as faults. The gradient technique is used for depth estimation of some gravity source which shows that the sources depth range between (13.65 - 5.36) km. Some gravity sources confirms the depth of basement rocks, while other shallow sources related to sedimentary cover, on an assumption of body source approximated to a horizontal cylindrical. The Total Horizontal Derivative (THD) technique is used to identify the faults trends in the sedimentary cover and basement rocks depending upon gravity and magnetic data. The identified faults in the study area show (NW-SE),(NE-SW) and(N-S)trends. Most faults extending from the basement to the upper most layer of the sedimentary cover rocks. Depending on the detected faults, the main tectonic boundaries of the region were obtained.

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