| Autor: |
Kechang Li, Jintang Qin, Ning Di, Qi Liu, Yuan Yao, Jie Chen, Jinfeng Liu, Zhaoning Li, Furong Cui, Yashi Sui |
| Předmět: |
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| Zdroj: |
Ancient TL; Jun2023, Vol. 41 Issue 1, p106-106, 1p |
| Abstrakt: |
For the alluvial river-fan system, the river incision process concentrates the water and detrital materials and forms an effective passage for mass transport. The global connection between climate change and river aggradation/incision phases have been intensively investigated on orbital scale. However, the pace of alluvial river incision on sub-orbital scale (10³-104 a) is rarely studied. On the northern piedmont of Chinese Tianshan, alluvial rivers entrenched the fan surface formed during the last glacial period, to a depth up to 200 m [1], with multi-level terraces abandoned since the late glacial. Jingou River, flowing across the Huoerguosi Anticline and Anjihai Anticline, incised the fan surface formed 13 ka to 12 ka ago [2], and left up to ten levels of terraces preserved. This terrace sequence holds part of river incision history. In this study, the luminescence dating methods, using both sediment grains and cobbles collected from the sandy-lens and cobbles of terrace deposits and overlying silty sands, are employed to constrain the abandoned ages of the terrace sequence and reveal its temporal rhythm. Both single grain potassium feldspar pIRIR technique and cobble slice pIRIR technique will be carried out to determine equivalent doses. Compared with the terrace on the south of Huoerguosi Anticline, the process of aggradation/incision of terrace on the north was influenced by a fault. Therefore, detailed abandoned age sequence would help evaluate the role of tectonic activity on the alluvial river incision on suborbital scale. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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