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

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research 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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.