The dunite–wehrlite–clinopyroxenite–gabbro massif in Eastern Chukotka, a key object for geodynamic reconstructions of the Vel’may terrane, which represents one of the segments of the southern border of the Chukotka folded system (Chukotka microcontinent, or Arctic Alaska–Chukotka microplate), is investigated. Mineralogical and petrological–geochemical studies of rocks of this massif are carried out. A comparative analysis of the primary mineralogy and formation conditions of cumulative rocks of dunite–wehrlite–pyroxenite–gabbro assemblages from modern island-arc systems, mantle transition zones, and crustal sections of ophiolites and ancient island arcs shows that the rocks studied are cumulates crystallized from a tholeiitic melt in an intraoceanic island arc at a moderately high pressure. The ⁴⁰Ar/³⁹Ar age of magnesian hornblende from gabbro indicates the massif was formed no later than in the Early–Middle Jurassic. The petrological and geochemical modeling suggests that the analyzed olivine clinopyroxenites and gabbros are probable plutonic comagmates of the Late Triassic island-arc basalts and dolerites of the Vel’may terrane. The arc segment represented by these rocks of the Vel’may terrane was probably part of the system of island arcs which had been reconstructed in this region for the age interval of 163 to 230 Ma. In addition, there is a tendency for the rejuvenation of the Middle Triassic–Late Jurassic island-arc magmatism in the direction from west to east, namely, from the South Anyui terrane of Western Chukotka through the Vel’may terrane of Eastern Chukotka to the Angayucham terrain of Alaska.

楚科奇东部的辉长岩-辉绿岩-斜辉石-辉闪岩块体，是维勒梅地貌地球动力学重建的重要对象，代表了楚科奇褶皱系统（楚科奇微大陆，或北极阿拉斯加-楚科奇）的南部边界之一微孔板）进行了研究。对该地块的岩石进行了矿物学和岩石地球化学研究。对现代岛弧系统，地幔过渡带，蛇绿岩和古岛弧的地壳剖面中的辉长岩-辉砂岩-辉石-辉长岩组合的主要矿物学和形成岩的形成条件进行比较分析，结果表明所研究的岩石是结晶的块状来自洋中岛弧中的熔融熔体，压力适中。的⁴⁰的Ar /³⁹辉长岩的镁质角闪石的Ar年龄表明，地块的形成不早于中侏罗世。岩石学和地球化学模型表明，分析的橄榄石斜辉石和辉长岩可能是晚三叠世岛弧玄武岩和Vel'may地幔的白云岩的深成岩。Vel'may地貌的这些岩石所代表的弧段可能是岛弧系统的一部分，该岛弧已在该地区重建，年龄间隔为163至230 Ma。此外，中三叠世-侏罗纪晚岛弧岩浆活动有从西到东的复兴趋势，即从楚科奇西部的安南南部地层穿过楚科奇东部的梅尔梅地层一直到阿拉斯加的Angayucham地形。