Volcano–Plutonic Complex of the Tumrok Range (Eastern Kamchatka): An Example of the Ural-Alaskan Type Intrusion and Related Volcanic Series

Zoned plutons, composed of dunites, pyroxenites, and gabbroic rocks, have been referred to as the Ural-Alaskan type complexes (UA-complexes) occur in numerous paleo-arc settings worldwide. Many these are source rocks for economic placers platinum-group metals. Thus, it is important understand how UA-complexes form origin behavior elements (PGEs). It widely assumed that result from differentiation supra-subduction high-Ca high-Mg sub-alkaline magmas. However, there a lack direct evidence existence such magmas, mainly because cases being spatially temporally linked co-genetic volcanics unknown. We studied an UA-complex Tumrok range (Eastern Kamchatka) where dunite-clinopyroxenite-gabbro assemblage temporary related (i.e., picrites basalts). Based on mineral chemical composition chemistry, melt inclusions hosted within rock-forming minerals, we conclude intrusive share same parental magma ankaramitic composition. Furthermore, compositions plutonic typical Finally, exhibit full sequence olivine-only liquidus dunites eutectic crystallization diopside or hornblende, plagioclase, K-Na feldspar plagio-wehrlites rocks. All results make considered volcano–plutonic complex promising case petrological studies modelling formation.