Role of latitudinal compression in the formation of Paleozoic intrusive structures in the southern Primorye region in the Far East

The structural-geodynamic features of the Anna, Gaidamak, Dunai, Tinkan, and Tafuin gabbroid and granite intrusions are analyzed. They are recently considered as elements of the basite Sergeevka terrane, which was previously known as the Sergeevka metagabbroid inlier (or massif). At the same time, their outcrops mark the ENE-trending Tafuin anticlinorium, which, being conjugate and synchronous with the northerly adjacent Petrovka depression, was formed in the Mesozoic as a constituent of the long-living Sergeevka structure. Therefore, these intrusions are considered in this work along with Cretaceous massifs, which occur among Mesozoic sediments, as resulting from tectonic-magmatic pulses transforming the basic substrate. These pulses mark the Proterozoic-Early Paleozoic, Late Paleozoic, and Mesozoic geodynamic periods with each being characterized by particular directions of the lateral compression with the Late Paleozoic one being the most intense. The latter was responsible for the near-meridional elongation of the structures and the dominant directions of their elements: the layering, banding, taxitic textures, cleavage, and foliation. All of them were determined by the cleavage formation and thrusting (in form of counter thrusts) of the same direction. The intrusions exhibit shear-type pseudofolds, which are considered as produced by flattening and warping.