The Uspensk intrusion in south Primorye as a reference petrotype for granitoids of the transform continental margins

Abstract

Identification of the granitoid complexes as petrotypes of definite tectonic settings remains one of the most important geological problems taking into account the large volume of fundamental tectonic and applied regional works. To the present, the granitoids of within-plate environments, island arcs, subductionrelated continental margins, and collisional settings have been substantiated and studied in detail [1‐3 and others]. At the same time, the granitoid associations of transform plate boundaries have been studied significantly less well. Transform continental-margin settings (Californiantype complex settings) related to subsidence of the oceanic ridge beneath a continent with the formation of slab windows and wide development of strike-slip faulting were distinguished for the first time at the western margin of North America [4 and others]. A similar regime was later substantiated for the Early Cretaceous and Paleogene stages of the Sikhote Alin evolution [5, 6]. Unlike the Californian coast, the transform margin setting in the Russian Far East was not complicated by mantle plumes that were unrelated to subduction. Therefore, this region is a unique object for distinguishing magmatic complexes typical of the transform‐continental setting.