Three-dimensional structure and evolution of an asymmetric pull-apart basin
Three-dimensional structure and evolution of an asymmetric pull-apart basin
复制标题
非对称拉分盆地三维结构及演化
DOI：
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发表时间：
2017
影响因子：
2.3
通讯作者：
Y. Hamiel
中科院分区：
文献类型：
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作者：
A. Sagy;Y. Hamiel
本文分析了以色列加利利高地碳酸盐岩中发育的一个长约250 m的不对称拉分盆地的构造。盆地几何形状的重建是基于断层崖的详细测绘和激光雷达测量。断层的结构，然后被用作边界条件计算应力模式在盆地附近，使用位错模型。盆地为不对称的V型构造，边界为两条纵向斜交的右行走滑断层。其中一条断层的走向在盆地东缘弯曲，形成一条横向边界断层，与第二条边界断层正交连接。总体侧向位移小于盆地长度，在盆地西端没有观察到横向或斜向断层。盆地周围的变形主要以断裂为表现形式。而在边界断层的端部和断层段的折点附近，则可观察到褶皱和断层分支。三维模型的应力分析结果与盆地内及周边断裂的走向和高变形区的位置基本一致。根据我们的观察，我们提出了一个概念模型，展示了不对称盆地的发展，在释放弯曲，揭示了类似的大型拉分盆地的结构。
The structure of a ~250-m-long asymmetrical pull-apart basin developed in carbonate rocks at the Galilee heights, Israel, is herein analyzed. The reconstruction of the basin geometry is based on detailed mapping and LiDAR measurements of fault scarps. The architecture of faults is then used as a boundary condition for calculating the stress pattern in the vicinity of the basin, using a dislocation model. The basin is found to be an asymmetrical V-shaped structure bordered by two longitudinal oblique right-lateral strike–slip faults. The strike of one of the faults is bent at the eastern edge of the basin, generating a transverse boundary fault which joins the second boundary fault orthogonally. The overall lateral displacement is smaller than the basin length, and no transverse or diagonal fault is observed in the western end of the basin. The deformation around the basin is mostly displayed by fractures. Yet, folds and fault branches are observed near the tips of the boundary faults and near kink points of fault segments. Stress analysis obtained by the three-dimensional model is in general agreement with the orientation of fractures and location of high deformation regions in and around the basin. Based on our observations, we present a conceptual model which demonstrates the development of asymmetric basins in releasing bends and sheds light on the structures of similar large pull-apart basins.