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首页> 外文期刊>Tectonics >Emplacement of the Triassic Pueblito Pluton, NW Colombia: Implications for the Evolution of the Western Margin of Pangea
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Emplacement of the Triassic Pueblito Pluton, NW Colombia: Implications for the Evolution of the Western Margin of Pangea

机译：三叠纪Pueblito Pluton，西北哥伦比亚的进驻：对Pangea西缘演化的启示

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摘要

We present the first structural geology focused study of a Triassic pluton in the Northern Andes, which provides new insights into the understanding of the tectonically complex northwestern corner of South America. Based on a combination of field structural data (377 stations) and a detailed magnetic susceptibility survey, 159 sites, we studied the structure of the Pueblito Pluton (PP), an original suprasubduction mafic cumulate structure emplaced in the northern part of the Arquia Terrane (western margin of Central Cordillera of Colombia). Even though the PP has resided along an active margin for over 230 million years ago, geochronology suggests no postcrystallization Ar-loss and, probably, no major reset of the original emplacement fabric. The PP magnetic fabric is dominatly parallel to the measured field foliation and formed under submagmatic to high-temperature conditions, at the final stages of cooling. The pluton internal contacts, mylonitic structures along the western margin, shape of the pluton, scalar parameters of the magnetic fabric, the directional field/magnetic data, and the geochronological data are compatible with a sinistral transpressional tectonic regime of emplacement by ca 233Ma. This regime was regionally extended in the Arquia and Tahami Terranes (western margin of Pangea).
机译：我们介绍了北安第斯山脉三叠纪岩体的第一个以结构地质为重点的研究，它为了解南美洲构造复杂的西北角提供了新的见解。基于现场结构数据（377个站）和详细的磁化率调查，共159个站点，我们研究了Pueblito Pluton（PP）的结构。哥伦比亚中科迪勒拉西部边缘）。尽管PP的活跃边缘已经存在了2.3亿多年，但根据地质年代学，它没有结晶后的Ar损失，而且很可能没有原始镶嵌织物的重大复位。 PP磁性织物主要平行于测得的场叶，并在冷却的最后阶段在亚岩浆到高温条件下形成。岩体内部接触，沿西缘的my状构造，岩体形状，磁性织物的标量参数，方向场/磁性数据和地质年代数据与大约233Ma的左构造压构造构造相兼容。该政权在Arquia和Tahami Terranes（Pangea的西边缘）得到了区域扩展。

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