Migration of Cenozoic deformation in the Eastern Cordillera of Colombia interpreted from fission track results and structural relationships: Implications for petroleum systems
Migration of Cenozoic deformation in the Eastern Cordillera of Colombia interpreted from fission track results and structural relationships: Implications for petroleum systems
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DOI：
10.1306/01051009111
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发表时间：
2010-10
期刊：
影响因子：
3.5
通讯作者：
A. Mora;B. Horton;Andrés Mesa;J. Rubiano;R. Ketcham;M. Parra;Vladimir Blanco;Diego Garcia;D. Stockli
中科院分区：
文献类型：
--
作者：
A. Mora;B. Horton;Andrés Mesa;J. Rubiano;R. Ketcham;M. Parra;Vladimir Blanco;Diego Garcia;D. Stockli
以前未发布的裂变径迹结果和区域构造关系被用来解释迁移变形在新生代造山作用在东科迪勒拉（科迪勒拉东方）的哥伦比亚安第斯山脉。低温热年代学的结果是基于磷灰石和锆石裂变径迹分析的41个样品收集沿着垂直和水平横断面横跨东科迪勒拉在4- 7 N纬度。裂变径迹结果的逆模拟有助于界定与上地壳变形有关的折返作用所引起的最可能的冷却历史。这些反演模型受到已知的构造几何学、年代地层学、生物地层学和镜质体反射率数据的约束。裂变径迹数据和模拟结果表明，在时间和风格的变形沿着西部和东部的侧翼东科迪勒拉密切对应。渐新世晚期和中新世早期，沿利亚诺斯前陆盆地东部边界沿着发生了向东的褶皱-逆冲变形。同样，沿西部边界沿着的西向褶皱-逆冲构造与马格达莱纳山谷盆地中部的山间盆地在大约同一时间开始活动。不太为人所知的是东部科迪勒拉的轴段内的初始缩短的时间;虽然裂变径迹的结果表明，早在中新世活跃的剥露，缩短可能已经开始早得多的始新世晚期。东科迪勒拉山脉的时间关系对马格达莱纳河谷中部山间盆地和利亚诺斯前陆盆地的石油生成、运移和聚集具有重要意义。我们的研究提供了一个区域背景下，以评估构造圈闭开发的时机，并改善勘探和开发新的和现有的油藏在哥伦比亚和类似的褶皱冲断系统在其他地方。
Previously unreleased fission-track results and regional structural relationships are used to interpret the migration of deformation during Cenozoic orogenesis in the Eastern Cordillera (Cordillera Oriental) of the Colombian Andes. Low-temperature thermochronological results are based on apatite and zircon fission-track analyses of 41 samples collected along vertical and horizontal transects across the Eastern Cordillera at 4–7N latitude. Inverse modeling of fission-track results helps delimit the most probable cooling histories caused by exhumation linked to upper-crustal deformation. These inverse models are constrained by known structural geometries, chronostratigraphy, biostratigraphy, and vitrinite reflectance data. Fission-track data and modeling results indicate a close correspondence in the timing and style of deformation along the western and eastern flanks of the Eastern Cordillera. East-directed fold-thrust deformation along the eastern boundary with the Llanos foreland basin was underway by the late Oligocene and early Miocene. Similarly, west-directed fold-thrust structures along the western boundary with the intermontane middle Magdalena Valley Basin became active at approximately the same time. Less well known is the time of initial shortening within the axial segment of the Eastern Cordillera; although fission-track results suggest active exhumation by the early Miocene, shortening may have commenced much earlier during the late Eocene. Timing relationships for the Eastern Cordillera have important implications for the generation, migration, and accumulation of petroleum in the middle Magdalena Valley intermontane basin and the Llanos foreland basin. Our study provides a regional context to assess the timing of structural trap development and improve exploration and development of new and existing reservoirs in Colombia and analogous fold-thrust systems elsewhere.