FORMATION CONDITIONS OF HIGH-GRADE TIN-COPPER ORES IN THE CHURPUN'YA DEPOSIT (YAKUTIA)

Abstract

At present, only the Churpun’ya cassiterite–silicate–sulfide vein deposit is mined for tin ore in Yakutia. The present communication discusses the results of study of the metallogenic features of the ore district and thermobarogeochemical investigations of high-grade ores from the Churpun’ya deposit. The deposit is located in the Chokohur–Chokurdakh ore-bearing zone of the Northeast Yakutian metallogenic belt. The ore-bearing zone extends in the meridional direction over 250 km and coincides in space with an intermittent chain of small uplifts among Cenozoic sediments of the Yana–Indigirka lowland. Based on seismic exploration and prospecting drilling data, the friable sedimentary cover of the lowland is 60–110 m thick. The uplifts are composed of low-angle Jurassic flyschoid sediments and Late Jurassic–Early Cretaceous volcanosedimentary sequences. Their formation was related to the intrusion of granodiorite, subalkaline amphibole–biotite granite, and subvolcanic rhyodacite bodies. Volcanic rocks are located at the Svyatoi Nos termination of the Oloi volcanoplutonic belt.