| 1. |
- Elias, Ziyad, et al.
(författare)
-
Assessment of the Tectonic Activity in Northwestern Part of the Zagros Mountains, Northeastern Iraq by Using Geomorphic Indices
- 2019
-
Ingår i: Geotechnical and Geological Engineering. - : Springer. - 0960-3182 .- 1573-1529. ; 37:5, s. 3995-4007
-
Tidskriftsartikel (refereegranskat)abstract
- The Tectonic Activity of regions with active tectonics can be assessed by using of the geomorphic indices. Six Geomorphic indices including stream-gradient index (SL), drainage basin asymmetry (Af), drainage basin shape (Bs), hypsometric integral (Hi), valley floor width-valley height ratio (Vf), and mountain-front sinuosity (Smf) were calculated using GIS technique in Kifri Chai Basin; northeast Iraq, which belongs to the Western Zagros Mountain. The basin was divided into eighteen sub-basins depending on the 4th, 5th and 6th stream orders of the drainage within Kirfi Basin. It was found that the SL, Af, Bs, Hi, Vf, and Smf (J) values are uniform and exhibit almost the same classes. However, few exceptions occur, especially in Bs values, but the exceptional values do not influence significantly on the acquired results, in each of the eighteen sub-basin. From these indices the relative active tectonics index value (Iat) was determined. The results of average Iat values (2.35) showed that the tectonic activity in the whole basin is Moderate. Moreover, an attempt was carried out to compare the regional Neotectonic activity with the relative tectonic activity in the basin. The results showed that there is a positive relation between the two comparatives; especially the subsidence amount and scored relative tectonic activity.
|
|
| 2. |
- Sissakian, Varoujan, et al.
(författare)
-
Deducing the Lateral Growth of Anticlines using Drainage Analysisand Geomorphological Features
- 2019
-
Ingår i: Geotectonics. - : Springer. - 0016-8521 .- 1556-1976. ; 53:1, s. 140-154
-
Tidskriftsartikel (refereegranskat)abstract
- The Low Folded Zone in Iraq is an active tectonic area witnessing different evidences for Neotectonic activities, among them are the lateral growth of Jambour, Pulkhana, and Qumar anticlines which are part of anticlinal series in the Low Folded Zone and Zagros Fold–Thrust Belt. The exposed rocks are of Middle Miocene – Pleistocene age overlain unconformably by different types of Quaternary sediments which show different indications for lateral growth. Three anticlines are dissected by tens of different size valleys crossing the anticlines forming water gaps and wind gaps which are good indication for the anticlines lateral growth. We studied the lateral growth of three anticlines using different means of qualitative analysis of satellite imagery and digital topography and ArcGIS technique. The anticlines lateral growth was mainly manifested by the drainage system and patterns which exhibited strange courses during dissecting the three studied anticlines. Moreover, the main streams deposited alluvial fans during Early Pleistocene and even Early Holocene which were also influenced by both lateral and vertical anticlines growth. Their abnormal shapes, abandoned fans and streams were among indications. We measured different geomorphological indices which indicated tectonic activity of the study area.
|
|
