Age Estimation of Qash Qooly Valley in Dokan Vicinity, North Iraq Using Exposure Age Determination Method

• Published in: Tu mu gong cheng yu jian zhu 2015-01, Vol.9 (1), p.90-103
• Main Authors: Sissakian, Varoujan, Al-Ansari, Nadhir, Knutsson, Sven
• Format: Article
• Language: English
• Subjects: Geoteknik; Sara; Soil Mechanics; 伊拉克; 年龄估计; 晚更新世; 暴露年龄; 曝光; 沉积物; 测定方法
• ISSN: 1934-7359; 1934-7367; 1934-7367
• DOI: 10.17265/1934-7359/2015.01.011

Qash Qooly valley runs parallel to Pera Magroon, Sara and Surdash anticlines, almost in SE-NW trend, and merges with the Lesser Zab River 9 km southeast to Dokan town. Before its development, it was a large basin with width ranges between 2-3 km, which was filled during Pleistocene or may be Late Pliocene by different types of sediments. The presence of the calcrete on the top indicates a wet period that has lasted for a long time as indicated from the thickness of the calcrete and alluvial fan sediments. The age of Qash Qooly valley was estimated using the exposure age determination method. The type of the sediments, their thicknesses, and erosion intensity and sediments＇ dens dissection by rills were the main features used. This study concluded that the age of the basin is Pliocene--Late Pleistocene, whereas the valley started to be developed during uppermost Late Pleistocene and is still active in shifting its course.