Identification of magma sources and their role in the origination of basaltic magmas still remains one of the fundamental petrological problems. Based on new comprehensive isotope–geochemical and mineralogical data, the contribution of a pyroxenite mantle source was recognized for the first time for Oligocene basalts in the northern part of the East Sikhote Alin volcanic belt. The most important indicators of this source are significant variations in the first-row transition elements ratios (Zn/Fe = 11–17 and Zn/Mn = 6–10), Cr/Ni (1.8–6) and the Ni concentration (2000–3600 ppm) in olivine. The behavior of LIL elements suggests the presence of amphibole in a pyroxenite protolith. The obtained data can be used for the correct reconstruction of the magma generation and geodynamic environment in this territory in the Late Cenozoic.

岩浆源的识别及其在玄武岩浆形成中的作用仍然是基本的岩石学问题之一。根据新的综合同位素-地球化学和矿物学数据，在东锡克霍特阿林火山带北部，渐新世玄武岩首次发现了辉石岩地幔源。该来源最重要的指标是第一行过渡元素比率（Zn / Fe = 11–17和Zn / Mn = 6–10），Cr / Ni（1.8–6）和Ni浓度（2000年）的显着变化。 –3600 ppm）在橄榄石中。LIL元素的行为表明在辉石原石中存在闪石。获得的数据可用于新生代晚期该地区岩浆的生成和地球动力学环境的正确重建。