中文
  7~12 c
Geological Section Landscape

Stratigraphic Section

Local Annotation Section

Lacustrine Deposit Section of Qiangtang Formation

 

Lacustrine Deposit of Qiangtang Formation is a set of strata consisting of gravel-clay distributed over Kunlun Mountain Pass with a thickness of more than 596m. The entire formation is inclined to the south at 8-12°. The Lacustrine Deposit of Qiangtang Formation was formed 21.9-1.65 million years ago. Hipparion's fossils were found in the lake deposits of the Qiangtang Formation. The Hipparions were extinct horses that were widely distributed from the Miocene to the Pleistocene and lived 1,000-2,000m above sea level. This discovery proves that Mount Kunlun experienced a great uplift for 2,800-3,800 m after the Quaternary.

 

Lacustrine Deposit Section of Qiangtang Formation

 

Sedimentary Facies Section 

Typical Sedimentary Facies Section

Thousand Layer Cliff at Wild Yak Valley

 

Located on the right bank of the Kunlun River in the mouth of the Wild Yak Valley, the steep cliffs formed by the uplifts and fluvial outwash extend from northeast to southwest and has a length of about 500m and a height of 8m. The Thousand Layer Cliff is formed by almost horizontal stacking sand and gravel layers of the Quaternary Early Pleistocene (about 2.6 million years ago), which constitutes a large-scale parallel bedding, with clear stratigraphy and a large scale. The parallel bedding was generally formed in jet flows and high-energy hydrodynamic environments, suggesting that there was a river with turbulent flow. Seen from a distance, the cliff looks like a layer of stacked rocks cut by blade. The fine texture seems like the skin of the earth. It tells people quietly about the changes in the geological era.

 

Thousand Layer Cliff at Wild Yak Valley

 

Aeolian Cross-bedding

 

This cross-bedding is wind-induced and plate-like with a length of about 30m and a height of about 10m. It appeared in the late Pleistocene of the Quaternary period about 126,000 to 11,000 years ago. The cross-bedding is large, and the thickness up to 2.5m. The inclination of the fine layer is relatively large which is generally 22 to 25°and up to 30°. The tendency of the fine layer changes greatly, indicating the different ancient wind directions. The “paint” of sand grains can be observed under the microscope, indicating that the cross-bedding was caused by wind instead of flowing water. The sand layer is covered with a river alluvium about 20cm thick. Clear ripples were seen between the layers. The wave is 15cm long and 2cm high, indicating that the sand dunes were submerged by current in the later period. The Aeolian Cross-bedding reveals the local palaeoclimatic changes between the glacial-interglacial periods in the area.

 

Aeolian Cross-bedding

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