The Role of 'Postore' Basaltoids in the Formation of Ore-Bearing Hydrothermal Solutions

摘要

The study of numerous epithermal deposits ranging in age from Paleozoic (Omolon Craton) to Late Meso-zoic (Okhotsk-Chukot volcanogenic belt) and Miocene-Pliocene (Kamchatka) revealed that nearly all ore fields incorporate postore dikes (sills and stocks) of basaltic andesites. Dikes of dolerites, microgabbro, and other basic rocks are developed in some places. Subvolcanic bodies show a wide range of variation in size. Thin dikes (0.3-1 m) in sedimentary rock fields extend from a few meters to 5 km or more.