The integration of inverse thermal history modeling of new geochronological data with structural analyses from the western flank of the Domuyo volcano (∼36°30′S) allows us to propose a detailed cooling history of a key region in the Southern Andes. The Domuyo area is located in the northwestern part of the Chos Malal fold-and-thrust belt in the back-arc of the Southern Andes. Despite extensive geological investigations in this region, details about the early stages of Andean deformation remain poorly understood. The present study focuses on the interpretation and integration of new U-Pb, fission track, and (U-Th-Sm)/He data constraining the Cretaceous to Paleogene exhumation history of the Southern Andes at these latitudes. The results indicate two main episodes of rapid cooling during Albian-Campanian and Eocene times that can be related to exhumation driven by two main contractional pulses. The first event promoted basement cooling/exhumation associated with the uplift and erosion of a broad N-S striking antiform; whereas the Eocene episode triggered the inversion of the preexisting N-S striking Manchana Covunco normal fault and the deformation of the Mesozoic sedimentary cover. The two orogenic phases are separated by a potential period of orogenic quiescence during the Paleocene. These new insights highlight the importance of the initial compressional stages of mountain building in the Southern Andes at these latitudes.

中文翻译：

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南安第斯山脉 (36°–37°S) 的白垩纪和始新世快速冷却阶段：来自阿根廷 Domuyo 地区的低温热年代学、U-Pb 年代学和逆热建模的见解

新地质年代学数据的逆热历史建模与 Domuyo 火山西侧（~36​​°30'S）的结构分析相结合，使我们能够提出安第斯山脉南部关键地区的详细冷却历史。Domuyo地区位于南安第斯山脉弧后的Chos Malal褶皱冲断带西北部。尽管对该地区进行了广泛的地质调查，但对安第斯变形早期阶段的详细信息仍知之甚少。本研究的重点是解释和整合新的 U-Pb、裂变轨迹和 (U-Th-Sm)/He 数据，这些数据限制了这些纬度的南安第斯山脉从白垩纪到古近系的挖掘历史。结果表明，在阿尔比-坎帕阶和始新世期间，两次主要的快速冷却事件可能与由两个主要收缩脉冲驱动的剥落有关。第一个事件促进了与广泛的 NS 显着反形体的隆起和侵蚀相关的地下室冷却/剥脱；而始新世事件触发了先前存在的 NS 撞击 Manchana Covunco 正断层的反转和中生代沉积盖层的变形。两个造山阶段被古新世潜在的造山静止期分开。这些新见解突出了这些纬度的安第斯山脉南部山区建设的初始压缩阶段的重要性。第一个事件促进了与广泛的 NS 显着反形体的隆起和侵蚀相关的地下室冷却/剥脱；而始新世事件触发了先前存在的 NS 撞击 Manchana Covunco 正断层的反转和中生代沉积盖层的变形。两个造山阶段被古新世潜在的造山静止期分开。这些新见解突出了这些纬度的安第斯山脉南部山区建设的初始压缩阶段的重要性。第一个事件促进了与广泛的 NS 显着反形体的隆起和侵蚀相关的地下室冷却/剥脱；而始新世事件触发了先前存在的 NS 撞击 Manchana Covunco 正断层的反转和中生代沉积盖层的变形。两个造山阶段被古新世潜在的造山静止期分开。这些新见解突出了这些纬度的安第斯山脉南部山区建设的初始压缩阶段的重要性。