Drainage Indications on the Growth of Anah Anticline, West of Iraq
2016 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 6, no 1, 29-46 p.Article in journal (Refereed) Published
Anah anticline is a conspicuous structural and geomorphological feature in the central western part of Iraq, which is a flat plain dissected by dense drainage net, some of the valleys cross the anticline; whereas others run on both sides, the axis not being the water divide. The anticline trends almost E – W with length of about 90 km, the northern limb is steep, whereas the southern lomb is very gentle; giving monoclinal shape to the anticline. The oldest exposed rocks in the core of the anticline belong to the Baba Formation of Middle Oligocene age, whereas the carapace is built of the Euphrates Formation of Early Miocene age and partly by the Anah Formation of Late Oligocene age, all formations consist mainly of limestone, those of the Anah Formation are very hard to extremely hard, splintery; locally silicified and karstified.Anah anticline forms the extreme western part of the contact between the Inner and Outer Platforms of the Arabian Plate. Towards the north is the Jazira Zone, whereas towards the south is the Western Desert Zone. The continuation of the contact; towards southeast is the active Abu Jir – Euphrates Fault Zone. Anah anticline was originally a subsurface graben, which was inverted to anticline during Late Cretaceous – Paleocene, as many others towards north of the anticline; within the Jazira Zone. Many valleys cross the anticline in S – N trend; the largest one is Chab'bab valley, which exhibits canyon form in some parts with sharp knick point. Many other valleys exhibit knick points too along their courses; through crossing the anticline. The height of the knick points ranges from (3 – 8) m, all are located along one lineament, which is almost parallel to the axis of the anticline. The knick points along the courses of the valleys and the crossing of the anticline by many valleys; forming wind gaps are clear indications for the lateral and vertical growths of the anticline.
Place, publisher, year, edition, pages
2016. Vol. 6, no 1, 29-46 p.
Research subject Soil Mechanics
IdentifiersURN: urn:nbn:se:ltu:diva-8134Local ID: 69b468b2-01d2-4ba8-83ca-aea3a73aec0dOAI: oai:DiVA.org:ltu-8134DiVA: diva2:981025
Validerad; 2015; Nivå 1; 20151103 (nadhir)2016-09-292016-09-29Bibliographically approved