Geochemical constraints on the petrogenesis of granitoids in the East Kunlun Orogenic belt, northern Tibetan Plateau: Implications for continental crust growth through syn-collisional felsic magmatism

Early Triassic syn-collisional granitoids with mafic magmatic enclaves (MMEs) crop out along the entire East Kunlun Orogenic belt (EKOB) at the northern margin of the Tibetan Plateau. They are andesitic in composition and enriched in light rare earth elements (LREEs) with a flat heavy REE (HREE) pattern. Their average composition resembles that of the bulk continental crust. The enclosed MMEs have the same mineralogy as their host granitoids, but contain a greater mode of mafic minerals (amphibole and biotite), and thus have higher HREE abundances. Zircon U-Pb dating shows that both the granitoid hosts and MMEs have the same crystallization age of similar to 250 Ma and indistinguishable bulk rock Sr-Nd-Pb-Hf isotope compositions (I-Sr of 0.7080-0.7116, varying Pb-206/Pb-204(i) of 18.53-19.32, essentially constant epsilon(Nd(t)) of -5.3 to -2.1 and a small range of positive epsilon(Hf(t)), mostly 1.7-5.2). The complete isotopic overlapping between the granitoid hosts and the MMEs is understood to reflect that the MMEs are disintegrated cumulates formed at an early stage of the granitoid magma evolution within the same magmatic system. The isotopic data set reveals that the granitoids are variably evolved melts produced by partial melting of the subducted Paleo-Tethyan oceanic crust with terrigenous sediments under amphibolite-facies conditions in response to the continental collision. (C) 2014 Elsevier B.V. All rights reserved.