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Figure 1

From: Early exhumation of the Frontal Cordillera (Southern Central Andes) and implications for Andean mountain-building at ~33.5°S

Figure 1

Location and geological background of the study area. (a) Topography of the Andes, along the boundary between South America and the subducting Nazca Plate. Box locates (b). (b) Structural scheme of the Southern Central Andean subduction margin, picturing the principal structural units. At ~33.5°S the Andes are structurally relatively simple and are constituted of the Principal and Frontal Cordilleras. The crustal-scale cross-sections of Fig. 5 are located. Box locates (c). (c) Structural scheme of the study region compiled from geological maps (23 and references therein), reporting the location of existing thermochronological ages within the Frontal Cordillera basement with black (this study) and white dots43. Black contours on the basement represent low relief surfaces as mapped by Hoke et al.43. FTB: fold-and-thrust belt; SRF: San Ramón Fault; (1): Cacheuta Basin (in b); (2): Alto Tunuyan intra-mountainous basin (in c). Digital Elevation model is extracted from SRTM3 data. Figure was generated with Adobe illustrator CS6 (http://www.adobe.com/fr/products/illustrator.html).

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