Geochemical evidences for quantifying crustal thickness over time in the Urumieh-Dokhtar magmatic arc (Iran)
作者： Razieh Chaharlang , Mihai N. Ducea , Jalil Ghalamghash
DOI: 10.1016/J.LITHOS.2020.105723
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摘要: Abstract Geochemical data on igneous rocks of the Urumieh-Dokhtar magmatic arc (UDMA) are used to reconstruct temporal variations in crustal thickness during Tertiary. We use two approaches, (1) whole rock Sr/Y and La/Yb ratios, (2) Nd isotopes an assimilation model for magma genesis. Our results indicate that crust was likely normal (~35 km) remained constant Eocene Oligocene, corresponding slab roll back extension along Eurasian active margin. Crustal thickening began early Miocene culminated middle (~50 km). This is marked by a distinct increase ratios (changing stability certain mineral phases) decrease ɛNd (increasing assimilation). Thickening due intrusion as well shortening consequence final Neo-Tethys subsequent continental collision.
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