Writers : Rabanifard, Ali Asghar; Mahboobi, Asadollah; Moussavi Harami, Reza; Najafi, Mahdi
Refference : 9th symposium of geological society of Iran, Tehran, Teacher Training university
Publishing Year : 1384

Abstract :
The Neyzar Formation (Early Maastrichtian) has an extensive exposure kopet_Dagh Basin in northeast Iran. It is mainly composed of carbonate as well as siliciclastic sediments (mostly fine to medium grain sandstone and shale). The lower boundary with the Abtalkh Formation is gradational and the upper boundary with Kalat Formation is erosional that is characterized by a paleosol horizon. For the purpose of this study, three stratigraphic sections in Kalat Syncline (Khesht and Jalil-A bad) and Tange- chahchaheh have been measured and ti. samples collected. Based on lateral and vertical lithofacies variations as well as petrographical studies, three depositional sequences in Chahchaheh and four depositional sequences in other sections were identified. All depositional sequences are formed by transgrresive and high stand system tracts. The sequence boundary of Neyzar Formation super sequence at the top of all sections is type and at the base (except the Chahchaheh area) is type r. Paleogeograph reconstruction of the studied area during Early Maastrichtian time indicates that these sediments were deposited during ten different stages. In the last stage when the area was exposed to erosion, the paleosol has formed. We believe that this information can be help in a paleogeographic reconstruction of the Kopet_Dagh Basin during the Maastrichtian time.
Subject List : Paleogeography, depositional history