Abstract Based on regional geology and stress tensor analysis from fault slickensides, we propose a structural model to explain the present-day configuration of a crystalline core in the northern Andes of Colombia (the Santander Massif - SM). The SM has undergone transpressional tectonics in a domino-style, controlled by longitudinal sinistral strike-slip faults as the Bucaramanga Fault. The tectonic style also exhibits NE-SW trending transverse inner faults with dextral strike-slip kinematics. The transpressional regime of the SM differs from the compressive regime that characterizes nearby blocks (northern Perija Range, southern Floresta Massif, and eastern Pamplona Wedge). Transpressional structures result from a regional W-E horizontal compression corresponding to the current stress field as determined here by cross-cutting relations, mainly observed in the Pamplona Wedge. Stress tensors also show maximum horizontal stress (SHmax) in radial pattern towards the wedge deformation front, whose influence spreads over the SM western border. The W-E regional compression also explains the tectonic syntaxes formed by the Pamplona Wedge to the north and the Sierra Nevada de Guican or El Cocuy to the south. These two areas are characterized by the opposite outward vergence of their compressive deformation fronts.

中文翻译：

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桑坦德地块和潘普洛纳楔的现代结构框架：北安第斯山脉的相互作用

摘要 基于断层滑坡的区域地质和应力张量分析，我们提出了一个结构模型来解释哥伦比亚安第斯山脉北部（桑坦德地块 - SM）的结晶核的当今构造。SM 经历了多米诺式的挤压构造，受纵向左旋走滑断层控制，如布卡拉曼加断层。构造样式还表现出具有右旋走滑运动学的 NE-SW 走向的横向内部断层。SM 的压压机制不同于附近块体（Perija Range 北部、Floresta 地块南部和 Pamplona Wedge 东部）的压缩机制。横压结构由区域 WE 水平压缩产生，对应于此处由横切关系确定的当前应力场，主要在潘普洛纳楔形区观察到。应力张量还显示径向模式中朝向楔形变形前沿的最大水平应力 (SHmax)，其影响遍及 SM 西部边界。WE 区域压缩也解释了由北部的潘普洛纳楔和南部的塞拉内华达德吉坎或 El Cocuy 形成的构造句法。这两个区域的特征在于它们的压缩变形前沿相反的向外聚散。