Age and duration of the formation of the Billyakh tectonic melange zone, Anabar shield |
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| Authors: | A P Smelov A B Kotov E B Sal’nikova V P Kovach V I Beryozkin A A Kravchenko V N Dobretsov S D Velikoslavinskii S Z Yakovleva |
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| Institution: | 1. Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, prosp. Lenina 39, Yakutsk, 677980, Russia
2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St-Petersburg, 199034, Russia
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| Abstract: | U-Pb geochronological and Sm-Nd isotopic-geochemical studies of granitoids of different structural-age position established that the collision between the Daldyn and Khapchan terranes of the Anabar shield and formation of the Billyakh tectonic mélange zone occurred between 1971 ± 4-1983 ± 3 Ma, while structural-metamorphic transformations corresponding to this collisional event lasted for 5?C19 Ma. It was shown that the granitoids of different structural-age position of the Billyakh zone were mainly derived from the Early Proterozoic crustal rocks with insignificant input of the Archean continental crust. |
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