| Measurement of terrace deformation and crustal shortening of some renascent fold zones within Kalpin nappe structure |
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| 作者姓名： | YANG XiaoPing RAN YongKang CHENG JianWu CHEN LiChun & XU XiWei Institute of Geology China Earthquake Administration Beijing China |
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| 作者单位： | YANG XiaoPing，RAN YongKang，CHENG JianWu，CHEN LiChun & XU XiWei Institute of Geology，China Earthquake Administration，Beijing 100029，China |
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| 基金项目： | 国家自然科学基金;国家地震局资助项目 |
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| 摘 要： | The Kalpin nappe structure is a strongest thrust and fold deformation belt in front of the Tianshan Mountains since the Cenozoic time. The tectonic deformation occurred in 5―6 striking Meso-zoic-Cenozoic fold zones, and some renascent folds formed on the recent alluvial-proluvial fans in front of the folded mountains. We used the total station to measure gully terraces along the longitudinal to-pographic profile in the renascent fold zones and collected samples from terrace deposits for age de-termination. Using the obtained formation time and shortening amount of the deformed terraces, we calculated the shortening rate of 4 renascent folds to be 0.1±0.03 mm/a, 0.12±0.04 mm/a, 0.59±0.18 mm/a, and 0.26±0.08 mm/a, respectively. The formation time of the renascent folds is some later than the major tectonic uplift event of the Qinghai-Tibet Plateau 0.14 Ma ago. It may be the long-distance effect of this tectonic event on the Tianshan piedmont fold belt.
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| 收稿时间： | 21 July 2005 |
| 修稿时间： | 27 February 2006 |
Measurement of terrace deformation and crustal shortening of some renascent fold zones within Kalpin nappe structure |
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| YANG XiaoPing,RAN YongKang,CHENG JianWu,CHEN LiChun & XU XiWei Institute of Geology,China Earthquake Administration,Beijing ,China.Measurement of terrace deformation and crustal shortening of some renascent fold zones within Kalpin nappe structure[J].Science in China(Earth Sciences),2007,50(1):33-42. |
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| Authors: | Yang XiaoPing Ran YongKang Cheng JianWu Chen LiChun Xu XiWei |
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| Institution: | Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The Kalpin nappe structure is a strongest thrust and fold deformation belt in front of the Tianshan Mountains since the Cenozoic
time. The tectonic deformation occurred in 5–6 striking Mesozoic-Cenozoic fold zones, and some renascent folds formed on the
recent alluvial-proluvial fans in front of the folded mountains. We used the total station to measure gully terraces along
the longitudinal topographic profile in the renascent fold zones and collected samples from terrace deposits for age determination.
Using the obtained formation time and shortening amount of the deformed terraces, we calculated the shortening rate of 4 renascent
folds to be 0.1±0.03 mm/a, 0.12±0.04 mm/a, 0.59±0.18 mm/a, and 0.26±0.08 mm/a, respectively. The formation time of the renascent
folds is some later than the major tectonic uplift event of the Qinghai-Tibet Plateau 0.14 Ma ago. It may be the long-distance
effect of this tectonic event on the Tianshan piedmont fold belt.
Supported by the National Natural Science Foundation of China (Grant No. 40572126) and China Earthquake Administration under
project Integrated Investigation of Seismogenic Structures for Intermediate-Strong Earthquakes in Jiashi-Bachu of Xinjiang
Uygur Autonomous Region. |
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| Keywords: | Tianshan Mountains Kalpin nappe structure active folds terrace folding crustal shortening |
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