The early Paleogene strike-slip tectonic setting along the northeastern Asian margin: structural control on magmatism

Research in southern Sikhote-Alin, a UNESCO World Heritage Site candidate region, reveals that early Paleogene calderas formed under NNW-oriented stress due to left-lateral strike-slip tectonics. These volcanic structures, indicative of transtensional and transpressional deformation, highlight the dynamic interaction between major fault zones—Central Sikhote-Alin and Vostochny Faults—which facilitated magmatic activity propagating from boundary faults inward. The study identifies a regional S-shaped structure, termed the 'sinistral kink band,' where NNE-trending strike-slip faults bend into NE-trending thrust zones, increasing basement permeability. This magmatic activity, dating to ~61–55 million years ago, serves as a marker of oblique plate interactions along the northeastern Asian margin, offering insights into the tectonic evolution of this critical region.

Kasatkin, S. A., & Grebennikov, A. V. (2022). The early Paleogene strike-slip tectonic setting along the northeastern Asian margin: structural control on magmatism. International Geology Review, 65(14), 2288–2314. https://doi.org/10.1080/00206814.2022.2151051