Measurement of terrace deformation and crustal shortening of some renascent fold zones within Kalpin nappe structure

查看全文 作　　者：YANG [1]XiaoPing;RAN [1]YongKang;CHENG [1]JianWu;CHEN [1]LiChun;XU [1]XiWei

机构地区：[1]Institute of Geology,China Earthquake Administration,Beijing 100029,China

出　　处：《Science China Earth Sciences》索引2007年第50卷第1期,共10页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 40572126);China Earthquake Administration under project Integrated Investiga-tion of Seismogenic Structures for Intermediate-Strong Earthquakes in Jiashi-Bachu of Xinjiang Uygur Autonomous Region. 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. 关键词：TIANSHAN Mountains Kalpin NAPPE structure active FOLDS TERRACE folding CRUSTAL shortening.

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Measurement of terrace deformation and crustal shortening of some renascent fold zones within Kalpin nappe structure

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