哥伦比亚安第斯山脉北部Girón组晚侏罗世同张性沉积与新生代盆地反转

IF 0.9 4区 地球科学 Q3 GEOLOGY
Diego Alberto Osorio Afanador, Francisco Alberto Velandia Patiño
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引用次数: 3

摘要

Yariguies背斜是一个位于哥伦比亚东科迪勒拉西部的区域性构造,包括侏罗纪-白垩纪边界附近堆积的最厚大陆沉积岩记录。沉积岩为岩屑砂岩和长石砂岩,属于Giron组,沉积在晚侏罗世伸展盆地中,在本工作中被解释为裂谷盆地。我们分析了在复杂裂谷系统中堆积的两个剖面的沉积学和成分特征。我们确定了重要的厚度变化,从Zapatoca地区的类型剖面中的3350-m到参考剖面中的至少525-m,以及岩相和岩相变化。这使我们确认,Giron组包含所有陆相,其烃源岩主要对应于晚侏罗世桑坦德地块的剥露区块。同一裂谷序列由裂谷肩的横向结构和区域纵向断层分割,如苏亚雷斯断层。研究区的构造框架显示了W-E挤压机制的相关性,解释了局部运动学是盆地先前构造和构造反转的遗产。然而,从应力张量分析中检测到应力场的顺时针旋转。应力张量和剪切节理的最新方向与研究区域沿线的Bucaramanga和Lebrija断层的影响有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Late Jurassic syn-extensional sedimentary deposition and Cenozoic basin inversion as recorded in The Girón Formation, northern Andes of Colombia
The Yariguies Anticlinorium, a regional structure located at the western flank of the Eastern Cordillera of Colombia, includes the thickest record of continental sedimentary rocks accumulated near to the Jurassic–Cretaceous boundary. The sedimentary rocks are lithoarenites and feldspathic arenites, grouped in the Giron Formation, and deposited in a Late Jurassic extensional basin interpreted in this work as a rift basin. We analysed the sedimentologic and compositional characteristics of two sections that accumulated in a complex rift system. We identified important thickness variations, from 3350-m in the type section to at least 525-m in a reference section in the Zapatoca area, as well as petrographic and lithofacies changes. This led us to confirm that the Giron Formation encompasses all the continental facies, whose source rock correspond mainly to the exhumed blocks of the Santander Massif during the Late Jurassic. The synrift successions were segmented by transverse structures and regional longitudinal faults of the rift-shoulder, as the Suarez Fault. The tectonic frame of the study area shows the relevance of the W-E compressional regimes, explaining the local kinematics as a heritage of the former configuration and tectonic inversion of the basins. However, clockwise rotation of the stress field was detected from the stress tensor analysis. The latest orientation of the stress tensors and shear joints are related to the effect of the transpressional Bucaramanga and Lebrija faults along the study area.
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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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