Zircon U–Pb ages and Sr–Nd isotope ratios for the Sirstan granitoid body, NE Iraq: Evidence of magmatic activity in the Middle Cretaceous Period

Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj–Sirjan zone, Iran: constraints from new zircon U–Pb and40Ar/39Ar ages and Sr–Nd isotopes

“…Also, the Nb/Ta ratio varies from 5.29 to 11.4 in the granitic samples in the Heris area (Advay & Ghalamghash, 2011), 11.1 to 16.9 in the Ghaleh-Dezh samples (this study), 13.31 to 19.33 in the rocks of Hasansalaran (Azizi et al 2017), 11.55-20.91 in the rocks of Damamna (Abdulzahra et al 2017) and 11.39-20.75 in Ghushchi granite (Moghadam et al 2015). Nb/Ta ratios of >17.6 in the granites display mostly positive correlation with Pb.…”

“…However, there is still no evidence of Ordovician-Silurian ('Caledonian') magmatic activity within Iranian continental crust of the SaSZ, although Late Palaeozoic magmatic activity, such as granitoids and gabbros, has recently been revealed in the SaSZ (e.g. Advay & Ghalamghash, 2011;Bea et al 2011;Alirezaei & Hassanzadeh, 2012;Moghadam et al 2015;Abdulzahra et al 2017;Azizi et al 2017; Table 1; Fig. 1).…”

“…Most Late Palaeozoic granites in the SaSZ form discrete, homogeneous bodies (except the Misho granitoid body; Ahankoub et al 2013), and no enclaves occur within the rocks (e.g. Advay & Ghalamghash, 2011;Bea et al 2011;Alirezaei & Hassanzadeh, 2012;Ahankoub et al 2013;Moghadam et al 2015;Abdulzahra et al 2017;Azizi et al 2017). They are grey-green to often pink in colour and coarse-to fine-grained.…”

“…In the northern part of the SaSZ, the beginning of the orogeny is revealed by intrusion of A1-type granites and mafic igneous rocks in the Early Carboniferous (e.g. Chiu et al 2013;Saccani et al 2013;Abdulzahra et al 2017;Azizi et al 2017) and continued until the Early Permian with the intrusion of Petrogenesis of the Ghaleh-Dezh metagranite A2-type granites (e.g. Alirezaei & Hassanzadeh, 2012).…”

“…(b) A/NK-A/CNK diagram (Shand, 1947;Maniar & Piccoli, 1989) for the Variscan granitic rocks of the SaSZ. Most of the rocks are metaluminous to slightly peraluminous, except the Hasansalaran (Azizi et al 2017) and Damamna granites (Abdulzahra et al 2017). (c) In K 2 O-SiO 2 diagram (Peccerillo & Taylor, 1976), the 'Variscan' granitoids plot in high-K calc-alkaline series (except the Hasansalaran granitoid (Azizi et al 2017)).…”