Origin of the Early Mesozoic Bogd Uul granite pluton, Ulaanbaatar area, Mongolia

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Abstract

We present new isotopic age and geochemical data of the Bogd Uul granite pluton occurred in the margin of Khentey uplift, in the Ulaanbaatar area. The Bogd Uul granite pluton consists of slightly peraluminous, high-K, calc-alkaline series biotite and hornblende-biotite granite of A2-type. The Rb-Sr isochron age of the Bogd Uul granite pluton in this study confirm our former determined early Mesozoic age of the single zircon lead evaporation, and U–Pb isotopic analyses using a Laser Ablation Inductively Coupled Plasma Mass Spectrometer (LA-ICP-MS). The Bogd Uul granite pluton is formed in post-collisional environment, and granitic magma derived from continental crust contaminated with juvenile mantle-derived component due to geochemical analyses and Rb-Sr isotopic data which show the initial 87Sr/86Sr=0.7005-0.7030, εNd(T)=(+0.7)– (+1.4), model ages of 826-1077 Ma. The topological analyses of zircon in the Bogd Uul granite pluton confirm the mixed sources which determined isotopic and geochemical data.

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