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地质学报  2006 

库车前陆褶皱-冲断带盐构造差异变形和分段性特征探讨

, PP. 313-320

Keywords: 盐构造,差异变形,分段性,库车前陆褶皱―冲断带,塔里木盆地

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Abstract:

通过野外地质调查、GIS分析、三维可视化分析、盐相关构造变形样式的探讨、平衡剖面分析以及缩短量和缩短率的估算,表明库车前陆褶皱―冲断带盐构造具有明显的差异变形和分段性特征。差异变形主要表现为纵向上不同层次变形的差异性以及平面上构造变形的分带性与分段性。段与段的分界一般为走滑断层,在野外可见大量断层三角面、擦痕、阶步、错断的山脊和河谷等现象,地貌GIS分析可以揭示一些构造分段的细节特征,三维可视化反映了隐伏的残留盐枕的分段性。不同的段具有迥然不同的构造变形样式,平衡剖面分析可以估算出不同段落缩短量和缩短率的明显差异。盐构造差异变形和分段性的形成一方面受控于天山造山带的分段性活动过程,还和盐岩层本身的沉积学特征及盐体展布格局有关,同时还明显受到基底构造的控制,与基底古隆起、基底断裂及古构造断坡的发育密切相关。

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