Bijan Etemadi; Batoul Taghipour; Abdolhadi Ghobadi; Amin Eslami; Mostafa Salimi Darani
Volume 3, Issue 10 , December 2012, , Pages 13-26
The Tertiary igneous rocks of Nodoushan area cropped out at about 130 km southwest of Yazd city in the Uromieh-Dokhtar Volcano-Plutonic belt. Based on the mineralogical and geochemical ...
The Tertiary igneous rocks of Nodoushan area cropped out at about 130 km southwest of Yazd city in the Uromieh-Dokhtar Volcano-Plutonic belt. Based on the mineralogical and geochemical studies, these volcanic rocks are composed of dacite, andesite, olivine basalt, and also pyroclastic (crystalline tuff), and micro-granodioritic intrusive rocks. Based on Y-Nb versus Y-Zr and Zr/Al2O3 versus TiO2/Al2O3 tectonomagmatic diagrams, these rocks show some indications of magmatic arc tectonic setting. As observed from the Ce/P2O5 vs. Zr/TiO2 diagram which discriminates the magmatic arcs of active continental margin from post-collision magmatic arcs, the studied rocks belong to the post-collision arcs (PAP). In the spider diagram normalized to MORB, HFS elements shows depletion, characteristic of magmatism at the volcanic arc setting. The K, Rb and Th enrichment as well as the negative anomaly of Ti, Ta, Nb and P indicate that the rocks studied formed in subduction zone.