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Formation of the Yazi Spring Stream and its significance on tectonics-climate on the northern slope of Kunlun Mountains
作者姓名:CHANG  Hong  ZHANG  Peizhen  AN  Zhishen  WANG  Xulong  QIANG  Xiaoke  FU  Chaofeng
作者单位:[1]State Key Laboratory of Loess and Quaternary Geology. Institute of Earth Environment, Chinese Academy of Sciences. Xi'an 710075. China [2]Graduate School of Chinese Academy of Sciences. Beijing 100039.China, Chinese Academy of Sciences. Xi'an 710075. China [3]State Key Laboratory of Seismic Dynamics. China Earthquake Administration. Beijing 100029, China
基金项目:Acknowledgements The authors would like to thank senior engineers Wang Genbao, Wang Xiangli, Li Dunpeng for their cooperation in the field, and Researcher Lu Yanchou for many thankful suggestions. This work jointly supported by National Basic Research Program of China (No. 2004CB720200) and the National Natural Science Foundation of China (Grant Nos. 40402016, 40202005).
摘    要:The sequences of fluvial terraces in the Yazi Spring Stream are signs of the stepwise uplift of the Kunlun Mountains in the northern part of the Tibetan Plateau since the Late Pleistocene. Geomorphic and sedimentary features of the terraces reveal that they have resulted from the phased tectonic uplift and the consequent river incision in the northern plateau. Using the method of Single-aliquot Regenerative-dose (SAR) Protocol and Radiocarbon ^14C dating, the deposit ages of three-grade terraces were obtained, which are 57.5, 12.8 and 5.7 kaBP, respectively. The features and ages of terraces reveal that the incision rate of the stream accelerated at the beginning of the Holocene. The incision rate changed suddenly at 12.8 KaBP, from 0.43±0.07 mm/a to 1.59±0.55 mm/a. This implicates that uplift of the Kunlun Mountains is intensive at the first onset of the Holocene, corresponding to the obvious change of slip-rate on the AItyn Tagh Fault. But its uplift rate is much lower than that of the latter, which suggests that growth of the northern margin of the Tibetan Plateau is stronger than its interior.

关 键 词:青藏高原  昆仑山脉  激励发光  沉淀特征  地球科学
收稿时间:2004-10-25
修稿时间:2004-10-252005-01-11

Formation of the Yazi Spring Stream and its significance on tectonics-climate on the northern slope of Kunlun Mountains
CHANG Hong ZHANG Peizhen AN Zhishen WANG Xulong QIANG Xiaoke FU Chaofeng.Formation of the Yazi Spring Stream and its significance on tectonics-climate on the northern slope of Kunlun Mountains[J].Chinese Science Bulletin,2005,50(18):2063-2068.
Authors:Hong Chang  Peizhen Zhang  Zhisheng An  Xulong Wang  Xiaoke Qiang  Chaofeng Fu
Institution:1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China
2. Graduate School of Chinese Academy of Sciences, Beijing, 100039, China
3. State Key Laboratory of Seismic Dynamics, China Earthquake Administration, Beijing, 100029, China
Abstract:The sequences of fluvial terraces in the Yazi Spring Stream are signs of the stepwise uplift of the Kunlun Mountains in the northern part of the Tibetan Plateau since the Late Pleistocene. Geomorphic and sedimentary features of the terraces reveal that they have resulted from the phased tectonic uplift and the consequent river incision in the northern plateau. Using the method of Single-aliquot Regenerative-dose (SAR) Protocol and Radiocarbon 14C dating, the deposit ages of three-grade terraces were ob- tained, which are 57.5, 12.8 and 5.7 kaBP, respectively. The features and ages of terraces reveal that the incision rate of the stream accelerated at the beginning of the Holocene. The incision rate changed suddenly at 12.8 KaBP, from 0.43±0.07 mm/a to 1.59±0.55 mm/a. This implicates that uplift of the Kunlun Mountains is intensive at the first onset of the Holo- cene, corresponding to the obvious change of slip-rate on the Altyn Tagh Fault. But its uplift rate is much lower than that of the latter, which suggests that growth of the northern mar- gin of the Tibetan Plateau is stronger than its interior.
Keywords:Tibetan Plateau  Kunlun Mountains  terrace  optically stimulated luminescence  tectonic uplift  
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