THE AGE AND TECTONIC SETTING OF THE LUKINDA DUNITE-GABBRO-ANORTHOSITE MASSIF IN THE EAST OF THE SELENGA-STANOVOI SUPERTERRANE, THE CENTRAL ASIAN FOLD BELT
I.V. Buchko1, A.A. Sorokin1, A.B. Kotov2, A.V. Samsonov3, Yu.O. Larionova3, V.A. Ponomarchuk4, A.M. Larin2
1Institute of Geology and Nature Management, Far East Branch of the Russian Academy of Sciences, per. Relochnyi 1, Blagoveshchensk, 675000, Russia
2Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia
3Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 199017, Russia
4V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Дуниты, троктолиты, габбро, пермь, триас, геохронология, Селенгино-Витимский пояс, Dunites, troctolites, gabbro, Permian, Triassic, geochronology, Selenga-Vitim belt
Subsection: PETROLOGY, GEOCHEMISTRY, AND MINERALOGY
Abstract
Results of integrated 40Ar/39Ar, Rb-Sr, and Sm-Nd geochronological studies of the Lukinda dunite-troctolite-gabbro-anorthosite massif in the northeast of the Selenga-Stanovoi superterrane, Central Asian Fold Belt, are presented. It is shown that this massif is much younger than formerly thought: 249 ± 14 to 251 ± 15 Ma vs. Paleoproterozoic. This date of magmatism corresponds to one of the stages of the formation of the Selenga-Vitim belt, which ranks among the largest Phanerozoic volcanoplutonic belts in Central Asia.
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