MONZONITOIDE ROCKS OF BILIKANO-KHULAMRINSKAYA MAGMATIC ZONE (NORTH-EAST OF THE RUSSIA): COMPOSITION, AGE AND GEODYNAMIC CONDITION
A.N. Glukhov, E.E Kolova, R.V. Solovov, M.A. Tanchenko
North-East Interdisciplinary Scientific Research Institute of Far East Branch of the Russian Academy of Sciences, Magadan, Russia
Keywords: monzonite, sienite, chemical composition, geodynamic, U-Pb age, magmatic zone, orogenic belt, volcanic belt.
Abstract
Undertaked analysis of composition of the monzonite-sienite intrusive rocks, is abundant in the area of Bilikano-Khulamrinskaya magmatic zone of Central segment of the Yana-Kolyma orogenic belt. That rocks compose of small intrusions, which cut of terrigenous strata of Inyali-Debin turbidite terrane. That contained medium quantity of silica and Al2O3, relatively high – K2O, Na2O, MgO and chemically similar with latite. By chemistry that very close to alkaline felsic intrusive rocks of Aldan magmatic province. Balance concentrations of chemical elements, pointed out to belonging this rocks, to granitoids of convergent continental margin, include syncollision volcanic arcs. Age of that, by U‒Pb zircone dating (SIMS) 84 Ma, coincide with secondary impulse of magmatic activity of the Okhotsk-Chukotka Volcanic belt. Specific chemical composition of monzonite rocks of the Bilikano-Khulamrinskaya magmatic zone, close to shoshonite and latite, determined by location far in rear volcanic belt, at 200 km from axis zone of that, on the sialic basement, presented by turbidite sedimentary rocks.
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