Internal structures of the pluton may provide key information on magma emplacement mechanism and the relationship with regional tectonics. We present a case study on the Late Triassic Gaoqiao pluton from South Qinling Belt, which was emplaced under a syn‐collisional setting. Multi‐approaches including zircon U–Pb geochronology, field and microstructural observations, anisotropy of magnetic susceptibility analysis was conducted to reconstruct the growth process of the pluton and to investigate the internal structures. Zircon U–Pb geochronology reveals that the pluton is a composite intrusion which was constructed by two successive units with distinct ages (~220 and ~210 Ma). Field observations show that the Gaoqiao pluton and its country rocks recorded abundant evidences of syn‐plutonic deformations, indicating a syn‐tectonic emplacement. Microstructural observations show that the internal fabrics were mainly acquired during the stage from magma flow to high‐T solid‐state deformation. The fabric distributions display ‘onion‐skin’ patterns on the pluton scale, which are characterized by zoned foliations and lineations. Combined with the syn‐collisional convergence setting, we propose a tectonic‐controlled incremental growth model for the pluton, in which the pluton was successively constructed by the Fujiahe unit and the Hetaoping unit, and the emplacement process of the pluton was controlled by the regional deformation with sinistral transpressional kinematics. Furthermore, the internal fabric patterns of the Gaoqiao pluton were probably formed by tectonic‐controlled helical magma flow, which appears to be common in fabric formation of many other plutons with similar features.

中文翻译：

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窦性压迫过程中的同构造构造：华南秦岭地带的晚三叠世高桥岩体

岩体的内部结构可能提供有关岩浆侵位机制以及与区域构造的关系的关键信息。我们以南秦岭地带的晚三叠世高桥岩体为例进行了研究，该岩体被置于同碰撞环境下。采取了多种方法，包括锆石U–Pb年代学，野外和微观结构观测，磁化率各向异性分析，以重建胶体的生长过程并研究其内部结构。Zircon U–Pb地球年代学表明，该岩体是由两个不同年龄（〜220和〜210 Ma）的连续单元构造而成的复合侵入体。野外观察表明，高桥岩体及其围岩记录了同生构造变形的大量证据，表明其构造构造。微观结构观察表明，内部构造主要是在从岩浆流到高T固态变形的阶段获得的。织物分布在子体规模上显示“洋葱皮”图案，其特征在于分区的叶和线条。结合协同碰撞收敛背景，我们提出了构造控制的岩体增量增长模型，其中岩体由富家河单元和河套坪单元相继构造，岩体的俯冲过程由区域控制。左压运动学的变形。此外，高桥岩体的内部构造模式可能是由构造控制的螺旋岩浆流形成的，这似乎在许多其他具有相似特征的岩体的构造中很常见。