Composition,age, and tectonic position of granitoids of the Shmakovka complex |
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Authors: | N N Kruk V V Golozubov T B Bayanova S A Kasatkin |
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Institution: | 1.Sobolev Institute of Geology and Mineralogy (IGM SO RAN), Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;2.Novosibirsk National Research State University,Novosibirsk,Russia;3.Far East Geological Institute (DVGI DVO RAN), Far East Branch,Russian Academy of Sciences,Vladivostok,Russia;4.Geological Institute, Kola Scientific Center,Russian Academy of Sciences,Apatity,Russia |
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Abstract: | The geological, geochemical, and geochronological data on the granitiods of the Shmakovka massif, which represents a petrotype of the synonymous complex (southern Russian Primorye), show that the granitoid intrusions of the Shmakovka Complex play a “coupling” role, occurring in different blocks of the Khanka composite terrane. The geochemical and isotopic features of the granitoids indicate that their formation resulted from melting of a “mixed,” substantially metapelite, source similar to the most intensely metamorphosed rocks of the Khanka massif. According to U–Pb measurements, the granitoids are 490 ± 1 Ma old. The analysis of the distribution of Early Paleozoic I-, S-, and A-type granitoids in southern Primorye reveals that Late Cambrian–Early Ordovician endogenic events marked the amalgamation of Precambrian–Early Paleozoic blocks and the eventual formation of the Bureya–Jiamusi superterrane (Bureya–Khanka orogenic belt). |
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