A New Approach to Permian System in the Section of Gahkum Mountain (Zagros-Iran)

Abstract

The deposits of Permian system in Kuh-e-Gahkum consist of 480 m clastic subdiffusion of Faraghan Formation and carbonates of Dalan Formation. In this section, the sediments of Faraghan Formation, which is gradationally overlain by Dalan formation, unconformably overlies Zakin Formation (Lower Carboniferous). In the upper part, Kangan Formation rests on the Permian deposits with an erosional and unconformable contact. Studying the microscopic thin sections led to the identification of 37 genera and 37 species of Foraminifera as well as 14 genera and 15 species of algae. According to the identified foraminifera in Faraghan and Dalan Formations, the age of the rock units in Permian system is assigned to Julfian-Asselian.

Tracing the sedimentary response to the rifting and opening of the Meso‐Tethys Ocean

“…(2009); data of the Central Zagros are after Abedini et al . (2017), Kordi (2019) and Alipour et al . (2021); data of the Ritu area in the South Qiangtang Terrane are after Zhang et al .…”

“…Therefore, from the 300 to 273 Ma Lagar and Angjie formations to the 273 to 252 Ma Xiala Formation, the depositional environment changed from littoral to neritic, indicating a transgressive sequence. Similar Roadian–Wordian transgressive sequences have also been widely reported in Turkey (Stolle et al ., 2011), Oman on the Arabian Plate (Angiolini et al ., 2003, 2004; Chauvet et al ., 2009), Zagros (Abedini et al ., 2017; Kordi, 2019; Alipour et al ., 2021), the Ritu area in the South Qiangtang Terrane (Zhang et al ., 2019; Fan et al ., 2021a), the Sinuowushan area in the Himalayas (Xu et al ., 2010) and the Baoshan Terrane (Ueno, 2003; Zhang et al ., 2013; Huang et al ., 2015, 2017). These extensive Roadian–Wordian transgressions extend over 6000 km in scale, and occurred as the global sea‐level decreased (Haq & Schutter, 2008), indicating widespread tectonic subsidence in these regions (Fig.…”

“…Summary diagram showing the Early-Middle Permian depositional setting change, tectonic uplift and subsidence in the Tethys tectonic domain. Data of the Turkey region are afterStolle et al (2011); data of the Oman region are afterAngiolini et al (2003Angiolini et al ( , 2004 andChauvet et al (2009); data of the Central Zagros are afterAbedini et al (2017),Kordi (2019) andAlipour et al (2021); data of the Ritu area in the South Qiangtang Terrane are afterZhang et al (2019) andFan et al (2021a); data of the Baoshan Terrane are afterUeno (2003) andHuang et al (2015Huang et al ( , 2017; data of the Sinuowushan area of the Himalayas are afterXu et al (2010); data of the Shiquanhe area of the Lhasa Terrane are from this study. BS, Baoshan; H, Himalaya; SQ, South Qiangtang.…”