Том 13, № 1 (2019)

It is shown for the structures of the Late Permian–Early Triassic, Early–Late Cretaceous, and Early–Middle Miocene stages in the formation of the eastern margin of Asia that the evolution of the Earth’s crust included periods of tectonic reconstructions, which occurred practically instantaneously from the geological viewpoint. These periods are often shorter than the resolution of both local isotope and paleontological methods of dating.

The stratiform ferromanganese bodies in the Mesozoic chert formations of central Sikhote-Alin (Katen R., J₃) and Nadanhada-Alin (Khuntseling settlement, J_2–3), and the vein manganese deposit (K_tab) at the Glubinny settlement area (central Sikhote-Alin) are characterized for the first time. Jurassic primary ores occur as interlayers in clayey–siliceous units. They consist of grains and globules of Mn and Fe oxides of the psilomelane–pyrolusite group and goethite. The interlayers also contain the allogenic products of eroded sialic rocks (quartz, potassium feldspar, albite, kaolinite, muscovite, paragonite, illite, and zircon) and accessory ore minerals (monazite, sphalerite, galena, apatite, cassiterite, barite, pyrite, titanite, rutile, native silver, auricupride, cerianite, tetrahedrite, and intermetallic Cu₅Zn₃ and Ni₇Cu₄). In the vein ores, spessartine and rhodonite fill veinlets and form a matrix of tectonic breccia. Manganese oxides form crusts (up to 4 cm) on the Triassic chert lumps and blocks. They likely represent the products of oxidation and breakdown of former hydrothermal–metasomatic manganese carbonates and silicates in a supergene environment. In contrast to the manganese minerals from the stratiform ores, those of the vein ores do not contain Co, Ni, Zn, and Pb, which are involved in the sulfides and sulfoarsenides (Co-gersdorffite and Ni-cobaltite, smaltite, pentlandite, and other minerals). Magnetite; titanomagnetite; barite; chalcopyrite; pyrrhotite; galena; argentite; zircon; titanite; wollastonite; anhydrite; REE phosphates, silicates, and oxides; bismuthine; native Ag, W, Cu, Zn, and Ni; and intermetallic compounds (Cu₅Zn₃, (Pd, Pt)₅Cu and Pd₄Cu) are also recognized in the vein manganese ores.

The fluidolites and genetically related igneous rocks of the Mokrusha area were formed as a result of the injection of the melt with a high proportion of the fluid component dominated by H₂O, F, Cl, and hydrocarbons into the upper crustal layers. This particular had a significant impact on the mineralogical features of these rocks. In many aspects, in particular the mineralogy of the country rocks, the Paleocene explosive structures are similar to the lamproite pipes. The occurrence of rodingites and lamprophyre-like rocks in these structures, with prospects for commercial gold–palladium–platinum ore mineralization, is of special interest.