Fig. 1.

Overview maps and cross-section of the study area in the central Puna Plateau. (A) Shaded relief map showing morphotectonic provinces of the Central Andes. AP, Andean Plateau; EC, Eastern Cordillera; SFTB, Subandean fold-and-thrust belt; SBS, Santa Bárbara System; SP, Sierras Pampeanas. (B) Topographic map of the southern Central Andes showing major basins and ranges discussed in the text. Numbered squares indicate age of deformation onset and range uplift in Ma compiled from the literature (e.g., refs. 24–26, for a complete list see SI Appendix, Table S2). The white line delineates watershed between the internally drained Puna Plateau and adjacent provinces. (C) Geological map of the Salar de Pocitos basin and adjacent regions (Arizaro, Siete Curvas, and Pastos Grandes) modified after Alonso (27), Blasco et al. (28), DeCelles et al. (21), and Martínez et al. (29). PG, Salar de Pastos Grandes; TG, Salina Tolar Grande. Shown are a) a pseudo-fault-plane solution calculated from fault-kinematic indicators documenting thrust kinematics of the Macón Fault (SI Appendix, Table S3) and b) $\mathrm{\delta }$Dg and geochronologic sample locations with selected age estimates as listed in Table 1 and SI Appendix, Table S13. Black lines show the location of cross-sections shown in D and Fig. 3. The black star shows the location of the Quebrada Quirón site discussed in the text. (D) Schematic geologic cross-section (P’–P”’ in C) through the study area (modified after 21, 30). Bt, Batín Formation; Qt, Quaternary fill.