Citation: | Soheila Saki, Amir Ali Tabbakh Shabani, Mingguo Zhai, Yuruo Shi, Mahmoudn Sadeghian, Xiyan Zhu, Morteza Delavari Koshan, David R. Lentzv. Zircon SHRIMP U-Pb Ages, Geochemical, and Sr-Nd Isotopic Constraints on the Petrogenesis of the Middle Eocene Calc-Alkaline Andesitic Rocks: Implications for Continental Arc Magmatism and Slab Break-off in NE Iran. Journal of Earth Science, 2024, 35(6): 1832-1848. doi: 10.1007/s12583-023-1839-x |
The Torbat-e-Heydariyeh andesitic rocks (THA) are part of the Cenozoic continental arc magmatic system of the northern branch of the Neotethys Ocean (NE Iran). Columnar jointing is the most significant feature of these rocks and they also show porphyritic, vitrophyric, and vitroglomeroporphyric textures. Plagioclase, clinopyroxene, ±orthopyroxene are the major mineral phases. The SHRIMP U-Pb zircon dating yielded an age of 41.00 ± 0.69 Ma for the rocks (Middle Eocene, Bartonian). Geochemically, they are of medium- to high-K calc-alkaline affinity. Primitive mantle-normalized diagrams exhibit enrichment in large ion lithophile elements (LILE), such as Cs and Rb, and also depleted in high field strength elements (HFSE) and heavy rare earth elements (HREE), with prominent negative anomalies of Ti, Nb, Y, and Yb, suggesting a tectonic setting of an active continental margin. The chondrite-normalized REE diagram displays enrichment of light rare earth elements (LREE; LaN/YbN = 5.37–6.66) and small negative Eu anomalies (Eu/Eu* of 0.69–0.78). Thorium enrichment implies the reaction between the mantle wedge and the melt of subducting oceanic slab, and/or subducting sediment. The role of subducted sediments along with subducted oceanic lithosphere is evident in these magmatic rocks using Ba/La versus Th/Nd and Ba/Th versus LaN/SmN diagrams. The
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