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Volume 37 Issue 4
Aug 2026
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Fei Wang, Weiwei Ding, Pingchuan Tan. Cenozoic Sedimentation and Response to Greenhouse-Icehouse Transition in the Eastern Amundsen Basin, Arctic Ocean. Journal of Earth Science, 2026, 37(4): 1949-1964. doi: 10.1007/s12583-026-0076-5
Citation: Fei Wang, Weiwei Ding, Pingchuan Tan. Cenozoic Sedimentation and Response to Greenhouse-Icehouse Transition in the Eastern Amundsen Basin, Arctic Ocean. Journal of Earth Science, 2026, 37(4): 1949-1964. doi: 10.1007/s12583-026-0076-5

Cenozoic Sedimentation and Response to Greenhouse-Icehouse Transition in the Eastern Amundsen Basin, Arctic Ocean

doi: 10.1007/s12583-026-0076-5
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  • Corresponding author: Weiwei Ding, wwding@sio.org.cn
  • Received Date: 14 Jan 2026
  • Accepted Date: 05 Apr 2026
  • Issue Publish Date: 30 Aug 2026
  • The Amundsen Basin preserves a relatively complete Cenozoic sedimentary record, providing insights into the Arctic paleoenvironmental changes during the greenhouse-to-icehouse climate transition. This study establishes a Cenozoic stratigraphic framework for the eastern Amundsen Basin based on 19 multichannel seismic profiles integrated with IODP Expedition 302 (ACEX) drilling data. Through quantitative analysis of sediment budget variations and depocenter migration patterns, we reconstruct the Cenozoic sedimentary evolution. Key findings include: (1) Cenozoic sediment budget exhibits an "initial high, intermediate decline, and late recovery" trend: peaking at 18.21 × 103 km3/Myr during the warm-humid Early–Middle Eocene (56–45 Ma), declining by ~35% to 11.92 × 103 km3/Myr during Middle–Late Eocene cooling (45–34 Ma), reaching a minimum of 8.73 × 103 km3/Myr under pelagic-dominated Oligocene–Early Miocene conditions (34–20 Ma), and recovering to 9.91 × 103 km3/Myr since the Miocene (20–0 Ma), driven by glacial erosion, fluvial maturation, and ocean circulation reorganization. (2) Depocenter migration reflects provenance shifts: localized depocenters (~3 000 m) developed along the Laptev shelf margin during the Early–Middle Eocene, shifted toward the Lomonosov Ridge after the Middle Eocene with basin-wide thickness homogenization (200–500 m) during Oligocene–Early Miocene, and returned to Laptev margin dominance since the Miocene. (3) The Middle Eocene (~45 Ma) marks a critical turning point in Arctic sedimentary environment, evidenced by both the abrupt ~35% decline in sediment budget and significant differences in seismic reflection characteristics above and below this interface, with synchronous responses observed across multiple Arctic regions. Combined with ACEX ice-rafted debris records, these findings demonstrate that the Middle Eocene climate transition exerted regional control on Arctic sedimentation.

     

  • Conflict of Interest
    The authors declare that they have no conflict of interest.
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