Petrology of the Early Mesozoic ultramafic-mafic Luchina massif ( southeastern periphery of the Siberian craton )
I.V. Buchko a , A.A. Sorokin a , A.E. Izokh b , A.M. Larin c , A.B. Kotov c , E.B. Sal'nikova c , S.D. Velikoslavinskii c , A.P. Sorokin a , S.Z. Yakovleva c , Yu.V. Plotkina c
a Institute of Geology and Nature Use, Far East Branch of the RAS, 2 ul. Khmel'nitskogo, Blagoveshchensk, 675000, Russia
b Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
c Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 2 nab. Makarova, St.Petersburg, 199034, Russia
Keywords: Layered massifs; primary melt; geochronology; U-Pb method; subduction; plume; Dzhugdzhur-Stanovoy superterrane
Pages: 570-581
Abstract
Three zones of layered series - lower, middle, and upper - composed of dunites and plagiodunites, troctolites and olivine gabbros, gabbros and gabbronorites, respectively, have been recognized in the Luchina massif. The melt that produced the massif rocks was of picrite-basaltic composition (15-16% MgO), and its crystallization took place at 1300-1000
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