O.B. Selyangin

Research Geotechnological Centre, Far Eastern Branch of Russian Academy of Sciences, Petropavlovsk-Kamchatsky, 683002

New data about overturned bedding of nickeliferous intrusions located in the rocks of the mantle of Sredinno-Kamchatsky massif (SKM) flanks is analyzed with respect to competitive geosynclinal and collision-accretion conceptions of its origin. Features of massif structure, intrusions location and origin of parental high-magnesian boninite-like magma are better coordinated with tectonic nature of SKM as a middle massif in the structure of epigeosynclinal orogen.

Keywords: nickel-bearing intrusions, middle massif, collision-accretion, boninite-like magma.