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地质学报  2009 

库车前陆冲断带秋里塔格构造带水系形态与褶皱生长

, PP. 1074-1082

Keywords: 库车前陆冲断带,水系形态,褶皱横向生长,褶皱拼接

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Abstract:

水系形态能够非常敏感的记录活动构造的演化过程,尤其对于褶皱横向生长的地区,常形成特征的水系形态。库车前陆冲断带发育平行于南天山造山带走向的褶皱带,并形成特征的水系形态。利用遥感影像、卫星照片、以及从数字高程数据中提取的地貌和水系参数,对库车前陆冲断带秋里塔格构造带水系形态进行分析研究,得出库车前陆冲断带褶皱具有横向生长的演化特征,并识别出判别褶皱生长的5个水系形态标志。这些水系形态标志包括:不对称的水域形态,水系受到阻挡发生弯曲、捕获、并流现象,背斜脊部风口的形成以及高度依次降低排列,不对称的冲积扇体,被纵向河流分隔的两侧背斜的水系形态差异。褶皱的横向生长最终导致相互拼接形成更大规模的褶皱带,秋里塔格构造带正是由多条背斜的横向生长,并拼接而成现今延伸~300km的褶皱带。

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