NEOTECTONICS AND LITHOSPHERIC DENSITY STRUCTURE OF THE SIKHOTE-ALIN OROGENIC BELT AND ADJACENT TERRITORY: MODELING AND SIMULATION

The first numerical 2D modeling has been performed of the effect of local crustal and lithospheric mantle decompaction on the surface relief and on the character of its temporal development by the example of the southern Sikhote-Alin. A numerical block model based on the current density model of the region made it possible to reveal the cumulative sequential effect of some anomalous crustal and upper mantle bodies and the shear effect along the Moho. The modeling has shown a probable relationship of the neotectonic movements, previously identified through the structurtal analysis, with the upper mantle decompaction and crustal granitization within the Sikhote-Alin orogenic belt. It is implied that the evolution of the current vertical movements within the southern part of the belt may be driven by: 1) relationship of the Mesozoic orogeny relief and its early-stage neotectonic development with the evolution of crustal and upper mantle density inhomogeneities; 2) the Sea of Japan opening with formation of the Tatar Straight trough and a synchronous occurrence of the Late Oligocene – Miocene basaltic volcanism.

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