Syntectonic growth strata and implications for late Cenozoic tectonic uplift in the northern Tian Shan, China
Syntectonic growth strata and implications for late Cenozoic tectonic uplift in the northern Tian Shan, China
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DOI：
10.1016/j.tecto.2008.09.008
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发表时间：
2009
期刊：
影响因子：
2.9
通讯作者：
Jimin Sun;Zhenqing Zhang
中科院分区：
文献类型：
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作者：
Jimin Sun;Zhenqing Zhang
天山前陆盆地中断裂和褶皱的扩展是新生代地壳缩短和造山作用的一个重要过程，但对新生代构造变形的准确时间却知之甚少。根据生长地层和时代测定，天山中段同构造生长地层自6 Ma开始发育。几何学分析表明，生长层的形成与递进褶皱翼旋转有关。生长地层的形成与逆冲褶皱带的构造变形是同时发生的。结合沉积速率的显著增加和粗磨拉石沉积物的堆积，我们认为该地区晚新生代地壳缩短和造山作用始于约6 Ma，并持续到早更新世，是印度-欧亚会聚体系内陆内变形的结果。
Propagation of faults and folds in the foreland basins of Tian Shan is an important process accommodating Cenozoic crustal shortening and mountain building, but little is known about the accurate time of the Cenozoic tectonic deformation. Based on growth strata and age determination, we show that syntectonic growth strata began to develop in the middle part of Tian Shan since 6 Ma ago. Geometry analysis indicates that formation of the growth strata is associated with progressive fold-limb rotation. Formation of the growth strata is contemporaneous with the tectonic deformation in the thrusting and folding zones. Together with the remarkable increase of sedimentation rate as well as the accumulation of coarse molasse deposits, we conclude that the late Cenozoic crustal shortening and mountain building in the region initiated since about 6 Ma and lasted to the early Pleistocene, as a consequence of intracontinental deformation within the India–Eurasia convergent system.