关键词: 中国东北, 中生代盆地, 构造演化, 古太平洋板块, 蒙古—鄂霍茨克洋, 板块俯冲

Abstract: As a key region linking the West Pacific subduction system and the Central Asian orogenic belt, Northeast China witnessed a Mesozoic basins evolution closely related to multi-plate interactions. This study systematically investigates the geodynamic mechanisms of basin formation by analyzing tectonic-stratigraphic characteristics and lithospheric structures of NNE-trending Mesozoic sedimentary basins in Northeast China and adjacent areas, combined with both shallow processes and deep dynamic evolution of plate interactions. The results indicate that the Mesozoic basins in Northeast China exhibit a basin-and-range tectonic pattern, divided into western, central, and eastern basin groups, with a lithospheric structure thickening westward and thinning eastward. The basin evolution progressed through five stages: Early-Middle Triassic erosion and planation, Late Triassic-early Late Jurassic differential response to dual-sided subduction, Late Jurassic-early Early Cretaceous regional compression, middle-late Early Cretaceous extension dominance, and latest Early Cretaceous-Late Cretaceous alternating compression and extension. The superposition of two tectonic domains — the evolving subduction style of the Paleo-Pacific plate and the closure of the Mongol-Okhotsk Ocean—constitutes the core geodynamic control on basin evolution. Specifically, the regional extension triggered by the rollback of the Paleo-Pacific plate was the key driver for basin formation.

Key words: Northeast China, Mesozoic basins, tectonic evolution, Paleo-Pacific plate, Mongol-Okhotsk Ocean, plate subduction