ABSTRACT
It was shown that the Berezovka, Shel’ting, Komsomol’sk, and South Schmidt maficultramafic massifs (East Sakhalin ophiolite association) consist of highly diverse ultramafic rocks and gabbroids. The petrographic description of rocks from these massifs was made based on their examination under an optical microscope with regard to the rock nomenclature accepted in the Petrographic Code of Russia [2009]. Both the author’s descriptions of rocks and those by petrographers of the Sakhalin Geological Exploration Expedition [Explanatory note . . ., 2009] were used. In total, >20 petrographic varieties of ultramafic and mafic rocks were recognized and described.
