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Updated: Mar 17, 2026

Isolation of Quartz Grains for Optically Stimulated Luminescence OSL Dating of Quaternary Sediments for Paleoenvironmental Research

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Uplift-driven sediment redness decrease at ~16.5 Ma in the Yumen Basin along the northeastern Tibetan Plateau.

Weitao Wang¹, Peizhen Zhang^1,2, Wenjun Zheng¹

¹State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China.

Scientific Reports

|July 15, 2016

Summary

Climate shifts in the Tibetan Plateau were driven by rapid Qilian Shan uplift around 16.5 million years ago. This led to shorter weathering, increased wetness, and cooling, altering sediment properties.

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Area of Science:

Paleoclimatology
Neogene geology
Tibetan Plateau studies

Background:

The Cenozoic era saw significant climate shifts in the northeastern Tibetan Plateau, but their causes are not fully understood.
Accurate age-constrained proxy data are essential for deciphering the mechanisms behind these climatic changes.

Purpose of the Study:

To investigate the drivers of climate change in the northeastern Tibetan Plateau during the early to middle Miocene.
To establish a precise age model for sedimentary sequences in the Yumen Basin.

Main Methods:

Magnetostratigraphy for age determination.
Sediment color analysis (redness a*, lightness L*).
Grain-size analysis.

Main Results:

A distinct shift in sediment properties occurred around 16.5 million years ago in the Yumen Basin.
This shift included increased lightness, decreased redness, and a lower ratio of hematite to goethite.
These changes correlate with the rapid middle Miocene uplift of the Qilian Shan.

Conclusions:

The observed sedimentological changes indicate shorter weathering durations.
Climatic wetting and cooling occurred around 16.5 Ma.
These climatic and environmental changes were likely triggered by the rapid uplift of the Qilian Shan.