QUANTITATIVE ASSESSMENT OF THE POSSIBILITY OF METAL EXTRACTION FROM ROCKS DURING THE FORMATION OF THE RUDNOALTAISK-TYPE MASSIVE SULFIDE BASE-METAL DEPOSITS

Possible metal sources for the formation of massive sulfide base metal deposits located in sedimentary-volcanogenic associations are discuss ed. In Rudnyi Altai, metals could be extracted from minerals of host r ocks during their metamorphism (regional propylitization). The propyli tization could be related to the ancient marine water that drains off Na and Mg but absorbs K, Ca, and other elements, including metals remo ved from ore-bearing rocks. Calculations suggest that the amount of le ached metals is quite sufficient for the formation of deposits.