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September 3, 2026MineralsOpen Access

Quaternary Sedimentary Sequence and Paleoclimatic Evolution in the Southern Yinchuan Basin: Evidence from Sedimentology, Geochemistry, and Detrital Zircon U–Pb Geochronology of ZK01 Borehole

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Authors

LLLei LiuNingxia Seismological BureauLLLidong LiangNingxia Seismological BureauJYJie YangNingxia Seismological Bureau

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Implication

Borehole core analysis reveals five Quaternary paleoclimatic stages in a basin margin, indicating orbital monsoon and tectonic controls on drainage patterns.

Key Points

  • To reconstruct the Quaternary sedimentary sequence, paleoclimatic shifts, and basin-mountain tectonic relationships at the northeastern margin of the Tibetan Plateau.
  • Conducted sedimentological, paleomagnetic, and carbon-oxygen isotope analyses on the 203 m ZK01 borehole core.
  • Evaluated catchment weathering dynamics using whole-rock major and trace element geochemistry, including the Chemical Index of Alteration (CIA).
  • Determined sediment provenance across Late Pliocene to Quaternary strata through detrital zircon U–Pb geochronology.
  • Reconstructed five distinct climatic stages from ~2.58 Ma to the present, alternating between orbital-scale monsoon fluctuations, stable lake phases, and extreme arid alluvial fan environments.
  • Identified peak chemical weathering accompanied by positive carbon-13 and oxygen-18 isotope excursions during the Middle Pleistocene Climate Transition (~0.9–0.6 Ma).
  • Observed an upsection increase in 200–300 Ma zircon ages alongside declining Precambrian ages, demonstrating headward erosion and drainage reorganization driven by the Yellow River.

Cite This Study

Liu et al. (2026) studied this question.

synapsesocial.com/papers/6a9935e5636c6408cfa7e8d1https://doi.org/10.3390/min16090904
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