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Russian Geology and Geophysics

2004 year, number 2

THE AGE OF LATE MESOZOIC VOLCANOGENIC ROCKS OF NORTHERN TRANSBAIKALIA (estimated by the 40Ar/39Ar method)

F.M. Stupak and A.V. Travin*
Chita Institute of Mineral Resources, Siberian Branch of the RAS, 26 ul. Butina, Chita, 672090, Russia
* United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibisrk, 630090, Russia
Keywords: Rift-related volcanism, 40Ar/39Ar dating, trachybasalt, teschenite
Pages: 263-268

Abstract

The volcanogenic rocks of the Kalakan region are represented by: (a) effusions of the Late Mesozoic Vitim Series (trachybasalts), (b) associated subvolcanic intrusions (quartz syenite-porphyries), and (c) teschenites of the Tundak sill. Their 40Ar/39Ar ages suggest three stages of Early Cretaceous volcanism: Barremian (121-120 Ma), Aptian (120-114 Ma), and Albian (magmatic episode 1101 Ma). It is proven that the Tundak alkali basalts were separated in time from effusive and subvolcanic magmatites of two preceding stages.