Abstract In this work we study the evolution of one particular segment of the Southern Central Andes, the northern sector of the Malargue Fold and Thrust Belt (34°–35° LS), where limited access to the western section has delayed its exploration for years. Analyses of the structure, stratigraphy and sedimentology of different sections along the fold and thrust belt added to the recognition and analysis of growth strata geometries within the foreland basin allowed us to perform an evolutionary model. Our results suggest that during the Lower Jurassic a rift-related depocenter, the Alto Atuel depocenter, developed next to the international border between Argentina and Chile, which was characterized by an important volcanic contribution from the magmatic arc. During the Late Jurassic, a new extensional episode took place at these latitudes, where synextensional deposits were found in the Alto Atuel depocenter, suggesting that this region has suffered multiple extensional processes during the Jurassic. Growth strata within the Late Cretaceous Diamante Formation suggest that the orogenic front reached an eastern location at this time. Sedimentary and petrographic analyses support the hypothesis that the Diamante Formation represents a synorogenic unit. Furthermore, petrographic and provenance analyses developed in the Late Cretaceous to Miocene deposits suggest that during the Paleogene the main source areas were the magmatic arc and the Mesozoic deposits exhumed by the Andean orogen, in accordance with detrital zircon ages published by other authors. The final development of the fold and thrust belt during Neogene time generated growth strata within the wedge top section of the foreland basin. The detection of these geometries within the Agua de la Piedra Formation suggests that the last Neogene compressional phase started between 20 and 15 Ma.

中文翻译：

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阿根廷门多萨省马拉圭褶皱逆冲带北部构造演化

摘要 在这项工作中，我们研究了中南部安第斯山脉一个特定部分的演化，即马拉格褶皱和逆冲带 (34°–35° LS) 的北部部分，由于进入西部部分的通道有限，因此勘探工作推迟了多年。 . 对沿褶皱和逆冲带不同剖面的结构、地层和沉积学的分析，加上对前陆盆地内生长地层几何形状的识别和分析，使我们能够建立一个演化模型。我们的研究结果表明，在下侏罗纪，一个与裂谷相关的沉积中心，Alto Atuel 沉积中心，在阿根廷和智利之间的国际边界附近发育，其特征是岩浆弧的重要火山贡献。在侏罗纪晚期，这些纬度发生了一个新的伸展事件，在Alto Atuel沉积中心发现了同伸展沉积物，表明该地区在侏罗纪期间经历了多次伸展过程。晚白垩世钻石组内的生长地层表明，此时造山带已到达东部位置。沉积和岩相分析支持 Diamante 地层代表一个共生单元的假设。此外，晚白垩世至中新世沉积物的岩相学和物源分析表明，根据其他作者发表的碎屑锆石年龄，在古近纪期间，主要源区是岩浆弧和安第斯造山带挖掘出的中生代沉积物。新近纪时期褶皱逆冲带的最终发育在前陆盆地的楔形顶部产生了生长地层。在 Agua de la Piedra 组内检测到这些几何形状表明，最后一个新近纪挤压相开始于 20 至 15 Ma。