同沉积褶皱生长地层中沉积与构造关系

Relationship of Sedimentation and Tectonism in Growth Strata Developed by Growth Folding

生长地层详细记录了褶皱变形的运动学特征及发展演化过程。对同沉积褶皱的生长地层进行详细的几何学分析,结合地层年代学资料,可以揭示沉积与构造的相互影响,确定沉积速率与构造抬升速率的细微变化,及褶皱的活动期次。构造抬升速率和沉积速率的变化,可引起生长地层的上超、超覆和退覆。褶皱的形成可分为膝折带迁移和翼部旋转2种模式。以膝折带迁移为变形机制的褶皱,发展过程中翼部倾角不变,褶皱顶部与翼部的抬升速率相同,形成翼部平行状生长地层;以翼部旋转为变形机制的褶皱,发展过程中翼部长度不变,沿翼部各点的抬升速率呈线性变化,形成翼部楔状的生长地层。

The detailed analysis of geometry of growth strata kinematics of folding and the deformation history. Geometry is recognized to be a useful tool to understand the analysis together with chronostratigraphic control can be an invaluable tool to understand the interplay between sedimentation and tectonic activity, determine short-term variability in sedimentation, fold uplift rates, and unravel the episodic fold growth. The changes of fold uplift and sedimentation rates lead to onlap, overlap and offlap relationship in the growth strata. The de- formation of folding can be divided into hinge migration and limb rotation. The fold developed by hinge migra- tion has the same uplift rates in its crest and limb, which cause the formation of a parallel growth strata. Where- as, the fold developed by limb rotation has the different uplift r es in its crest and limb, and the uplift rates change linearly along the limb according to our study, which cause the formation of a wedge-like geometry in the growth strata.