The south-central Andes located between 32°-33° S are considered to be a transitional zone between the flat-lying and the normal subduction zones of the Nazca Plate. The active mountain-building processes are mainly concentrated between the Andean eastern foothills and the adjacent broken foreland, as highlighted by crustal seismicity, historic destructive earthquakes, and Quaternary-active contractional structures. Between 32° 10′ and 32° 40′ S, the Andean orogenic front is exposed at the Las Peñas-Las Higueras range, where east- and west-verging thrusts interact, resulting in an antithetic linkage transfer zone. We built kinematically-balanced structural sections through the integration of surface and subsurface data (2D seismic lines) to achieve a 3D characterization of the Quaternary-active thrusts and to estimate shortening rates of ∼1.8–3.4 mm/a during the last ∼8.5 Ma, thus extending the spatial and temporal penetration achieved by surface geology data. Our results indicate that the main east-verging thrusts detach at a depth of ∼10 km within Paleozoic basement rocks. This outcome implies larger potential rupture areas than if rooted at Neogene layers. West-verging thrusts present detachment levels at ∼5 km, also linked to Paleozoic basement rocks. The analysis of 2D seismic lines has also contributed to the recognition of blind thrusts without a morphologic signature, which could be regarded as relevant seismogenic structures.

中文翻译：

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安第斯造山带前缘新构造逆冲的运动学模型（阿根廷普雷迪勒拉南部）

安第斯山脉中南部位于南纬32°-33°之间，被认为是纳斯卡板块平俯带和正常俯冲带之间的过渡带。活跃的造山过程主要集中在安第斯山脉东部山麓和邻近的破碎前陆之间，表现为地壳地震活动、历史性破坏性地震和第四纪活跃收缩构造。在南纬 32° 10′ 至 32° 40′ 之间，安第斯造山锋暴露于拉斯佩尼亚斯-拉斯伊格拉斯山脉，东西向逆冲断层在这里相互作用，形成了一个对立的联系转换带。我们通过整合地表和地下数据（2D 地震线）构建了运动学平衡的结构剖面，以实现第四纪活动逆冲断层的 3D 表征，并估计过去 ∼8.5 Ma 期间 ∼1.8–3.4 mm/a 的缩短率，从而扩展了地表地质数据实现的空间和时间渗透。我们的结果表明，主要的东向逆冲断层在古生代基底岩石内约 10 公里的深度处分离。这一结果意味着比扎根于新近纪层更大的潜在破裂区域。向西的逆冲断层呈现约 5 公里的滑脱层，也与古生代基底岩石有关。二维地震线的分析也有助于识别没有形态特征的盲冲断层，可以将其视为相关的发震构造。