Title

N.I. GUSEV, V.E. RUDENKO, L.YU. SERGEEVA (VSEGEI), K.I. LOKHOV (SPb State University), N.G. BEREZHNAYA, A.N. LARIONOV (VSEGEI)

Archean granulites of Dzhelinda blok Anabar Shield (Siberian Сraton): geochemistry, age, isotopic characteristics

The paper presents data on petrographic and chemical composition of the rocks, U-­Pb age of zircon (SHRIMP II), Sm­-Nd isotopic system and zircon Lu­-Hf system from hypersthene plagiogneiss (enderbitoides) and crystalline schists of Daldyn and Verhneanabar series. Also studied ultramafic crystalline schists, charnokites and pegmatoid granitoids. Crystalline schists of Daldyn series contain own magmatic zircon with a concordant age of about 3.0 Ga, model age T_Hf (DM) of 3.27–3.39 Ga and crust extraction age T^C_Hf of 3.37–3.61 Ga. Plagiogneiss of Daldyn and Verhneanabar series is similar to rocks of TTG­series, but have high values of Eu/Eu* 1.33–1.99, and mg# 0.43–0.57. Plagiogneiss U-­Pb age is of about 2.86 Ga. Zircon is characterized by positive values ε_Hf (T) from +7 to +7.9, the same model age T_Hf (DM) and crust extraction age T^C_Hf of 2.8–2.9 Ga.
Keywords: Anabar Shield, granulites, enderbitoides, zircon, U­-Pb age, Sm-­Nd, Lu-­Hf systematics.