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<p>The Pearl River Mouth Basin (PRMB), a critical Cenozoic marine sedimentary basin and offshore hydrocarbon production area in China, lacks a precise chronological framework for its Neogene strata, hindering in-depth understanding of climate change drivers and sedimentary evolution during this period. In this study, we present a cyclostratigraphic analysis of gamma-ray (GR) well log data from the Zhuhai and Zhujiang Formations of Well LW-X in the Baiyun Sag, PRMB. Time series analysis of the GR data shows significant peaks with periods at 405 kyr and ~ 100 kyr (long and short eccentricity), 41 kyr (obliquity), and ~ 20 kyr (precession). Based on 405 kyr long eccentricity tuning of GR series, a high-resolution astronomical timescale of approximately 12.5 Myr spanning the Middle Oligocene to the Early Miocene was established. A marked decrease in GR values, coupled with abrupt increases in sedimentation rates and calcareous nannofossil abundance after 23&#xa0;Ma, was identified and interpreted as the Mi-1 glaciation event. We applied sedimentary noise model to reconstruct relative sea-level changes in our studied section based on the GR data. This reconstruction reveals a ~ 1.2 Myr cyclicity in relative sea-level change over the studied interval, suggesting a close relationship with long obliquity period climate forcing. These cycles exhibit strong consistency with the eleven third-order sequences interpreted by previous researchers (Boulila et al. 2011; Hardenbol et al. 1998). Taken together, we infer that ~ 1.2 Myr long obliquity forcing has played an important role in controlling climate, sea-level changes and third-order sequence development during the Middle Oligocene to Early Miocene.</p>

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Astronomically forced climate change during the Middle Oligocene-Early Miocene in the Pearl River Mouth Basin, Northern South China Sea

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Shizhen Jia,
  • Yanzhen Li,
  • Mengqing Shang,
  • Rui Liu,
  • Linzhen Hu,
  • Yongming Zhang,
  • Xiuju Xing,
  • Zi’ang Yang

摘要

The Pearl River Mouth Basin (PRMB), a critical Cenozoic marine sedimentary basin and offshore hydrocarbon production area in China, lacks a precise chronological framework for its Neogene strata, hindering in-depth understanding of climate change drivers and sedimentary evolution during this period. In this study, we present a cyclostratigraphic analysis of gamma-ray (GR) well log data from the Zhuhai and Zhujiang Formations of Well LW-X in the Baiyun Sag, PRMB. Time series analysis of the GR data shows significant peaks with periods at 405 kyr and ~ 100 kyr (long and short eccentricity), 41 kyr (obliquity), and ~ 20 kyr (precession). Based on 405 kyr long eccentricity tuning of GR series, a high-resolution astronomical timescale of approximately 12.5 Myr spanning the Middle Oligocene to the Early Miocene was established. A marked decrease in GR values, coupled with abrupt increases in sedimentation rates and calcareous nannofossil abundance after 23 Ma, was identified and interpreted as the Mi-1 glaciation event. We applied sedimentary noise model to reconstruct relative sea-level changes in our studied section based on the GR data. This reconstruction reveals a ~ 1.2 Myr cyclicity in relative sea-level change over the studied interval, suggesting a close relationship with long obliquity period climate forcing. These cycles exhibit strong consistency with the eleven third-order sequences interpreted by previous researchers (Boulila et al. 2011; Hardenbol et al. 1998). Taken together, we infer that ~ 1.2 Myr long obliquity forcing has played an important role in controlling climate, sea-level changes and third-order sequence development during the Middle Oligocene to Early Miocene.