Evolución de las cuencas Tumaco, Atrato y San Juan sobre una plataforma continua a lo largo del margen pacífico colombiano

IF 0.9 4区 地球科学 Q3 GEOLOGY
Jeny Alejandra Grajales, Á. F. Nieto-Samaniego, A. Tassara, Jairo Alonso Osorio, Luis Ernesto Ardila, Juan Fernando Martínez
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引用次数: 0

Abstract

Several authors have interpreted the Colombian Pacific margin as a succession of oceanic terrane accretions, with generation of forearc basins under a compressive-transpressive tectonic regime during the Late Cretaceous-Miocene. New data acquired in the last decade, consisting of reprocessed seismic lines, geological cross-sections, stratigraphic data from wells, and new stratigraphic columns, are analyzed in this study. We suggest that the proposed models of successive terrane accretions are not supported by the new data; rather, the onshore basins were likely controlled by a marine platform from the Late Cretaceous to the Middle-Late Eocene, with reef growth to the end of this period. In the Late Cretaceous, contemporary to the sedimentation stage, effusive magmatism, mainly basaltic, also occurred. Since Oligocene time, the basins were affected by three different tectonic processes. First, during the Oligocene-Early Miocene, an extensional-transtensional event occurred in the Tumaco Basin and San Juan Sub-basin, which produced horst and graben structures and domino faults, along with the emplacement of igneous bodies in the eastern flank of the basins. The Atrato Sub-basin was affected by local reverse faulting towards its eastern edge. Second, during the Mid-Late Miocene, the western side of the Tumaco Basin was uplifted, and transpressive deformation occurred in the San Juan Sub-basin as evidenced by the San Juan and Garrapatas fault systems. Finally, in the Atrato Sub-basin, a transpressional regime is evidenced by the Baudó anticline. Our results suggest there is no evidence of oceanic terrane accretions in the abovementioned basins during the Late Cretaceous-Middle Eocene. Furthermore, we do not see evidence of a subduction system during that period. We conclude that subduction in western Colombia could have begun during the Early Oligocene instead.
哥伦比亚太平洋边缘连续大陆架上的图马科盆地、阿特拉托盆地和圣胡安盆地的演变。
多位学者将哥伦比亚太平洋边缘解释为大洋地层的连续增生,在晚白垩世-中新世的压缩-横压构造体系下形成了弧前盆地。本研究分析了过去十年获得的新数据,包括重新处理的地震测线、地质横断面、油井地层数据和新的地层柱。我们认为,新数据并不支持所提出的陆相连续增生模型;相反,从晚白垩世到中晚新世,陆上盆地很可能受到海洋平台的控制,在这一时期末,礁石不断生长。在晚白垩世,与沉积阶段同时发生的还有喷出岩浆活动,主要是玄武岩活动。自渐新世以来,盆地受到三种不同构造过程的影响。首先,在渐新世-中新世早期,图马科盆地和圣胡安分盆地发生了一次伸展-张拉事件,产生了地角、地堑结构和多米诺断层,同时在盆地东侧形成了火成岩体。阿特拉托子盆地东部边缘受到局部逆断层的影响。其次,在中新世中晚期,图马科盆地西侧被抬升,圣胡安亚盆地发生了转位变形,圣胡安和加拉帕塔斯断层系统证明了这一点。最后,在阿特拉托子盆地,Baudó 反断裂证明了换位变形机制。我们的研究结果表明,没有证据表明上述盆地在晚白垩世-中始新世期间发生过海洋地层增生。此外,我们也没有发现这一时期存在俯冲系统的证据。我们的结论是,哥伦比亚西部的俯冲可能始于渐新世早期。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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