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Russian Geology and Geophysics

2015 year, number 12

GRANITOIDS OF THE GAMOV INTRUSION (southern Primorye), ITS PECULIARITIES AND INDICATOR AND GEODYNAMIC ROLE

N.N. Kruk, V.V. Golozubov, S.A. Kasatkin, S.N. Rudnev, A.A. Vrzosek, K.L. Kuibida, G.M. Vovna
Keywords: Granitoids, geochemistry, geochronology, southern Primorye

Abstract

We studied the geologic position, mineralogy, petrography, chemical composition, and age of granitoids of the Gamov batholith located in the Laoelin-Grodekovo terrane, southern Primorye (Russia). The studies have revealed four intrusive rock phases, from gabbro to leucogranites, in the massif. U-Pb zircon dating of tonalites of phase II and leucogranites of phase IV (254 ± 4 and 259 ± 2 Ma, respectively) shows that the intrusion of granitoids took place in the Late Permian without a significant gap in time. Structural investigations gave evidence for the intrusion in the sublatitudinal-compression setting. Geochemical studies have revealed granitoids of strongly different compositional types in the intrusive massif: gabbroids, quartz diorites and tonalites with characteristics of low-alumina TTG, calc-alkalic granodiorites and I-type granites, and medium-alkali leucogranites. The obtained data, together with the results of previous research into the Permo-Triassic granitoids of southern Primorye, reject the relationship of their formation with the evolution of the Solonker oceanic structures and suggest a more intricate tectonic scenario, which calls for additional study.