祁连山东南缘第四纪以来的隆升作用及动力学分析

樊光明; 张智勇; 顾延生; 张海峰; 冯光胜

Volume 28 Issue 4

Jul. 2003

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Article Navigation > Earth Science > 2003 > 28(4): 389-394

FAN Guang-ming, ZHANG Zhi-yong, GU Yan-sheng, ZHANG Hai-feng, FENG Guang-sheng, 2003. Uplifting since Quaternary in Southeastern Qilian Mountains and Its Dynamic Analysis. Earth Science, 28(4): 389-394.

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Uplifting since Quaternary in Southeastern Qilian Mountains and Its Dynamic Analysis

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2003-04-18
Publish Date: 2003-07-25

Abstract

Abstract

Quaternary structures and those multipleage stress changes reveal that the uplifting in southeastern Qilian Mountains results from the long-distance effect of the Indian plate compression and multiplex uplift mechanism on the adjacent massifs, producing the compression-uplifting, extension-uplifting and sinistral strike-slip uplifting in the area. The analysis of the stress and marker structures indicates that the uplift dynamic mechanism changes have occurred since Early Pleistocene epoch. The early Early Pleistocene is mainly NE-SW direction compression, the Middle Pleistocene to Early Holocene, mainly NE-SW and approaching E-W direction extension, while the Late Holocene is mainly NW-SE sinistral strike-slip. The stream valley downcutting rate since 1.41 Ma is estimated according to relative date of terrace from Huangshui River. The average rate from 1.41 Ma to 36.4 ka is slower, 0.11 mm/a, from 36.4 ka to the present, it is 1.54 mm/a and from 10.5 ka to 3 ka is 2.27-2.80 mm/a, the most rapid. It is shown that the tectonic uplifting in the area tends to be more and more intense since 1.41 Ma.
- southeastern Qilian Mountains,
- Quaternary,
- stream downcutting rate,
- uplift mechanism

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References(18)

References

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