Eastern Margin of the Neoarchean Tunguska Superterrane: Data from Boreholes in the Central Part of the Siberian Platform

Abstract The paper presents data on granites and gneisses recovered by Kulindinskaya-1 hole drilled in the central part of Siberian Craton. biotite retain a porphyritic texture, correspond to I-type according their compositional features, are enriched LREE moderately depleted HREE, have negative Eu, Sr, Nb positive Zr anomalies. U−Pb zircon age is Neoarchean (2525 ± 10 Ma), with single cores grains dated at about 2.6 Ga, which likely suggests crustal source granitic magmas. model T Nd (DM) = 2.77 Ga granite shows that crust from initial melts were derived had been formed shortly before melting episode. In terms all characteristics, close those Yurubchen massif, was through western Tunguska superterrane. gneiss apparently sedimentary rocks heavily reworked when emplaced. enrichment Cr Ni probably inherited protolith, whereas REE, HFSE, LILE concentrations distribution similar granite. concordant ( D < 1%) ages (according LA-ICP-MS data) broadly vary 3284 2620 Ma, two major peaks 2717 2678 Ma. 2.91 confirms contribution ancient component protolith rock. minimum detrital zircon, 2.62 determines maximum limit for sedimentation, set intrusions 2.53 Ga. According our data, Archean drillhole compose eastern Ereminskaya-101 drillhole, 20 km northeast Kulindinskaya-1, 2.30 2.37 belong adjacent Taimyr−Baikal suture zone widespread Paleoproterozoic rocks. contrasting history complexes provides grounds suggest they tectonically combined, an additional reason consider as collisional orogen.