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<p>The Mohe-Upper Amur Basin is situated adjacent to the southern margin of the eastern Mongol-Okhotsk Suture, and its Jurassic-Cretaceous sedimentary infill is crucial for revealing the final closure timing of the Mongol-Okhotsk Ocean and the tectonic evolution of Northeast Asia during the Late Mesozoic. However, there are still ongoing debates regarding the stratigraphic division and provenance evolution of this basin. Based on an analysis of the basin’s sedimentary successions and up-to-date geochronological data, this study reestablishes a stratigraphic correlation framework between the Mohe part in China and the Upper Amur part in Russia of the basin. The Xiufeng-Mohe formations in the Mohe Basin and the Usmanka-Tolbuzino formations in the Upper Amur Basin represent coeval heteropic successions deposited during the late Middle-early Late Jurassic, while the Kaikukang Formation in the Mohe Basin and Peremykino Formation in the Upper Amur Basin are contemporaneous synonymous stratigraphic units formed during the earliest Early Cretaceous. Detrital zircon U-Pb age spectra reveal that during the Jurassic, prior to the deposition of the Kaikukang Formation, the Mohe-Upper Amur Basin was fed by a single provenance, with sediments derived from the regions to the south of the basin. However, in the earliest Early Cretaceous, during the deposition of the Kaikukang Formation, the tectonic framework of the basin underwent a significant transformation, with a rapid shrinkage in sedimentary extent and the formation of a north-south dual provenance system. Integrating regional tectonic evolutionary data, this study proposes that the compressional tectonic regime and provenance shift recorded in the Mohe-Upper Amur Basin during the late Late Jurassic-earliest Early Cretaceous likely reflect the final closure of the Mongol-Okhotsk Ocean. The two phases of rifting during the late Middle-early Late Jurassic and during the Early Cretaceous may have been controlled by the far-field tectonic effects of a continent-continent collision along the southern margin of the Asian continent, which triggered tectonic escape of Northeast China and dominated the tectonic evolution in Northeast Asia during the Late Mesozoic.</p>

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Jurassic-early Early Cretaceous sedimentary and provenance evolution of the Mohe-Upper Amur Basin: Constraints on the closure of the eastern Mongol-Okhotsk Ocean

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Zhixin Guo,
  • Yongtai Yang

摘要

The Mohe-Upper Amur Basin is situated adjacent to the southern margin of the eastern Mongol-Okhotsk Suture, and its Jurassic-Cretaceous sedimentary infill is crucial for revealing the final closure timing of the Mongol-Okhotsk Ocean and the tectonic evolution of Northeast Asia during the Late Mesozoic. However, there are still ongoing debates regarding the stratigraphic division and provenance evolution of this basin. Based on an analysis of the basin’s sedimentary successions and up-to-date geochronological data, this study reestablishes a stratigraphic correlation framework between the Mohe part in China and the Upper Amur part in Russia of the basin. The Xiufeng-Mohe formations in the Mohe Basin and the Usmanka-Tolbuzino formations in the Upper Amur Basin represent coeval heteropic successions deposited during the late Middle-early Late Jurassic, while the Kaikukang Formation in the Mohe Basin and Peremykino Formation in the Upper Amur Basin are contemporaneous synonymous stratigraphic units formed during the earliest Early Cretaceous. Detrital zircon U-Pb age spectra reveal that during the Jurassic, prior to the deposition of the Kaikukang Formation, the Mohe-Upper Amur Basin was fed by a single provenance, with sediments derived from the regions to the south of the basin. However, in the earliest Early Cretaceous, during the deposition of the Kaikukang Formation, the tectonic framework of the basin underwent a significant transformation, with a rapid shrinkage in sedimentary extent and the formation of a north-south dual provenance system. Integrating regional tectonic evolutionary data, this study proposes that the compressional tectonic regime and provenance shift recorded in the Mohe-Upper Amur Basin during the late Late Jurassic-earliest Early Cretaceous likely reflect the final closure of the Mongol-Okhotsk Ocean. The two phases of rifting during the late Middle-early Late Jurassic and during the Early Cretaceous may have been controlled by the far-field tectonic effects of a continent-continent collision along the southern margin of the Asian continent, which triggered tectonic escape of Northeast China and dominated the tectonic evolution in Northeast Asia during the Late Mesozoic.