Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033 Russia Institute, Siberian Branch, Russian Academy...Sciences, ul. Sakh’yanovoi 6a, Ulan-Ude, 670047 Russia bGeological Received April 4, 2007 Abstract—The...of LREE. Secondary bastnaesite, synchysite, and ancylite are formed after allanite, while secondary monazite...rocks is situated in the middle reaches of the Kitoi River in eastern Sayan at the boundary of the Precambrian...Platform and the Kitoi Lithotectonic Zone of the Central Asian Foldbelt (Fig. 1). The Kitoi Zone is composed |