Basement reactivation and structural inheritance in the Jurassic to Neogene evolution of the North Patagonian Andes (41° 08’ – 41° 11’ S), Argentina

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2024-09-19 DOI:10.1016/j.jsames.2024.105170

Sofía Peltzer , María Belén Yoya , Ezequiel Olaizola , Florencia Bechis , Daniel Yagupsky , Pablo D. González , Miguel A.S. Basei , Sebastián Oriolo

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Abstract

Structural inheritance is a major control on the Andean structural architecture and magma emplacement, particularly in Patagonia, where the genesis of sedimentary basins and magmatic arcs has been largely influenced by basement fabrics. Based on new geologic, structural, microstructural and geochronologic data, the aim of this contribution is to evaluate the influence of pre-existing mechanical anisotropies of the Paleozoic basement on the Jurassic-Neogene tectonic evolution in the Paso de las Nubes area (North Patagonian Andes, Argentina). U-Pb zircon data of an orthogneiss yielded an age of 166 ± 2 Ma, which is consistent with the Jurassic batholith reported in the North Patagonian Andes, being thus coeval with retrograde metamorphism and deformation in the metasedimentary wallrock. Fault kinematic data indicate a Jurassic transtensional regime, strongly controlled by basement reactivation. On the other hand, a second kinematic population records a mainly strike-slip solution, associated with partitioned Neogene transpression.

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阿根廷北巴塔哥尼亚安第斯山脉（南纬 41° 08' - 41° 11'）侏罗纪至新近纪演化过程中的基底再活化和构造传承

结构继承是安第斯山脉结构构造和岩浆喷发的主要控制因素，尤其是在巴塔哥尼亚，沉积盆地和岩浆弧的成因在很大程度上受到基底构造的影响。根据新的地质、结构、微结构和地质年代数据，本文旨在评估古生代基底原有的力学各向异性对 Paso de las Nubes 地区（阿根廷北巴塔哥尼亚安第斯山脉）侏罗纪-新近纪构造演化的影响。一块正长片麻岩的 U-Pb 锆石数据显示其年龄为 166 ± 2 Ma，与北巴塔哥尼亚安第斯山脉所报道的侏罗纪浴成岩一致，因此与变质岩壁岩的逆行变质和变形同时发生。断层运动学数据表明，侏罗纪时期的扭转机制受到基底再活化的强烈控制。另一方面，第二组运动学数据记录了主要的走向滑动解理，与新近纪的分区换位有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.