New Ideas about Slip Folds between Layers
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摘要: 本文报道的是出现在许多沉积岩区, 发育在厚薄相间岩层之中, 并由于层间滑动作用形成的AB复合或过度型褶皱.它具有不止一个方位褶皱枢纽, 表征非共轴叠加褶皱形态, 经历了早期B形和晚期A形褶皱演化过程, 最终形成迄今鲜有报道, 但却实际广泛存在.文中首先介绍了这一褶皱在西藏、湖北黄石、湖北秭归, 四川西昌等地区的野外产出状态, 继而从横剖面、纵剖面、平面以及立体空间角度描叙了它的全方位几何形态特征, 进而从变形介质结构和剪应变值(γ) 的物性特征方面分析了它的变形控制条件, 最后以“滑移褶皱极限”理论并部分借鉴鞘褶皱的形成机理探讨了它的形成演化过程.
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关键词:
- 层间滑动作用 /
- AB复合或过度型褶皱 /
- 变形条件 /
- 形成机理
Abstract: The AB compound type or transitional type fold appears in many sedimentary areas, between thick and thin layers, made by slipping between layers. The fold has more than one hinges, which is the result of uncoaxal superimposed fold, underwent B type fold in early time and A type fold in late time. There is little report about this fold, however it is ubiquitous. In this paper, the author introduced the output state on field of this fold in Tibet, Hubei Wuhan, Sichuan Xichang firstly, then described the geometry shape characters in all trend of this fold, analyzed the deformation control condition of this fold, finally discussed the form and evolvement mechanisms of this fold based on Slump Fold Limit and reference of the form mechanism of sheath fold. -
图 1 层间滑动褶皱在横剖面(a) 及纵剖面(b) 上具有的形态特征
Fig. 1. Shape characters sketch map of slip fold between layers at cross section (a) and profile (b)
图 2 具有两个方向褶皱枢纽及叠加褶皱特点的层间滑动褶皱(a) 和偏Ⅰ型层间滑动褶皱的水平剖面特征及沙丘状空间形态(b)
Fig. 2. Slip fold between layers which has two hinges and superimposed fold characteristic (a) and the horizontal section characteristic and dune spatial shape of slip fold between layers which is close to Ⅰ type (b)
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