渝鄂湘边区构造样式分析

Analysis of Structural Styles at the Juncture of Chongqlng, Hnbel and Humnan

以T P Harding和J D Lowell的构造样式分类方案为基础 ,对研究区构造样式作了详细分类研究。根据基底是否卷入 ,将研究区构造样式分为基底卷入型和盖层滑脱型 2大类 ;根据应力传递方式 ,将基底卷入型构造样式分为挤压断块、张性断块和基底逆冲褶皱系 3类 ,盖层滑脱型构造样式分为逆冲褶皱组合和正断层组合 2类。根据褶皱和断裂的不同组合型式 ,进一步识别出 11种构造要素 ,即背冲断块、对冲断块、“垒堑”式组合、大型盲叠瓦冲断带、叠瓦扇、断弯背斜、断展背斜、滑脱背斜、构造三角带、双重构造、铲形正断层与滚动背斜等。由于多期构造变形的影响 。

Based on classification of structural styles of T. P. Harding and J. D. Lowell, a detailed classification of structural styles is made in the region studied. In consideration of the conditions if the base ment being involved or not, the structural styles are divided into two major categories of basement involvement and caprock detachment. According to the stress transmission mode, the structural styles of the basement involvement can be classified into compressional fault block, tensional fault block and basement thrust fold assemblages; the structural styles of the caprock detachment also can be grouped into thrust-fold assemblage and normal fault assemblage. Based on the difference assemblage types of the folds and faults, 11 structural elements, such as antiformal thrust fault block, ramp thrust fault block, horst-garben assemblage, large blind imbricate thrust belt, imbricate fan, fault-bend anticline, fault-propagation anticline, detachment anticline, structural triangle zone, duplex structure, listric normal fault, and rollover anticline are recognized. Due to the influence of structural deformation at different stages, there exist several structural styles of superposition in the region studied.