A tectono-stratigraphic record of an extensional basin: the Lower Jurassic Ab-Haji Formation of east-central Iran

Geochemistry of siliciclastic rocks from the Shemshak Group (Upper Triassic–Middle Jurassic), northeastern Alborz, northern Iran: implications for palaeoweathering, provenance, and tectonic setting

“…B -ma jor el e ment based tec tonic discrim i na tion plots for the low-sil ica sam ples (af ter Verma and Arm strong -Altrin, 2013): DF1(Arc-Rift-Col)m1 = [-0.263 (Dickinson and Suczek, 1979). This quartzolithic petrofacies iden ti fied in sand stones of the Shemshak Group is also re ported in the north of Alborz Range (Zanchi et al, 2009) and Cen tral Iran (Salehi et al, 2017). The dis crim i na tion di a grams of Bhatia (1983) and Roser and Korsch (1986) have been used com monly to de ci pher the tec tonic set ting of an cient sed i men tary bas ins (Nowrouzi et al, 2014;Jafarzadeh et al, 2014;Ogala et al, 2015;Vosoughi Moradi et al, 2016).…”

“…The siliciclastic Shemshak Group (Up per Tri as sic-Mid dle Ju rassic) is one of the most ex ten sive lithostratigraphic units of the Iran Plate, wide spread across the north ern Alborz and East Cen tral Iran of the Ira nian plate (Tabas and North of Kerman; Fürsich et al, 2009). Nu mer ous stud ies have doc u mented lithostratigraphic, sedimentological and palaeontological aspects of the Shem shak Group (e.g., Seyed-Emami et al, 2006;Fürsich et al, 2009;Shekarifard et al, 2009;Zanchi et al, 2009;Moosavirad et al, 2011Moosavirad et al, , 2012Abbassi and Madanipour, 2014;Salehi et al, 2017). These stud ies have shown that the Shemshak Group is com posed largely of siliciclastic rock, lo cally reach ing up to 4000 m in thick ness.…”

Sandstone petrography and geochemistry of the Nayband Formation (Upper Triassic, Central Iran): Implications for sediment provenance and tectonic setting

“…17A). Most of the samples in the three sections are back-arc extensional tectonic pulses was documented in CEIM during the Late Triassic to Late Jurassic Wilmsen et al, 2009a;Salehi et al, 2018b). A similar geodynamic setting has been offered for the CEIM and its southwestern margin (studied sections) in the geodynamic model of Cimmerian orogeny and the Triassic-Jurassic evolution of the Iran Plate (Wilmsen et al, 2009a).…”

“…In the north of Isfahan the Upper Triassic deposits are overlain with a distinct angular unconformity by Lower Cretaceous deposits, whereas the Jurassic sediments are almost missing completely (Mannani and Yazdi, 2009;Ghasemi-Nejad et al, 2013;Salehi et al, 2018a). Although Lower Jurassic fluvio-deltaic sediments occur in the Tabas Block, the western Lut Block of CEIM, Alborz and adjoining area (Fürsich et al, 2017;Salehi et al, 2018b). The first section is located in 60 km northeast Isfahan in the Dizlu area measured in detail at 33˚ 04' 45˝ N and 52˚ 02' 16˝ E with the total thickness of 352 m. It consists of five members (the Gelkan, Bidestan, Howz-e-Sheikh, Howz-e-Khan and Qadir) of Norian to Rhaetian age (Mannani and Yazdi, 2009).…”

Youngest Cretaceous dinosaur tracksite from the Middle East (Maastrichtian, Farrokhi Formation, Central Iran)

“…After its welding to Eurasia, the Iran Plate remained a tectonically highly mobile area in Jurassic times (e.g. Fürsich et al 2003;Seyed-Emami et al 2004;Taheri et al 2009;Salehi et al 2018;Wilmsen et al 2021). During the Early Cretaceous, strongly subsiding marginal oceans formed around the CEIM (Tirrul et al 1983;Babazadeh and De Wever 2004;Nasrabady et al 2011;Kazemi et al 2019;Pirnia et al 2020), probably in response to counterclockwise vertical-axis rotation of the microplate (e.g.…”