Cenozoic basin evolution of the Central Patagonian Andes: Evidence from geochronology, stratigraphy, and geochemistry

Quantifying Tectonic and Glacial Controls on Topography in the Patagonian Andes (46.5°S) From Integrated Thermochronometry and Thermo‐Kinematic Modeling

“…S1 and S2). This timeframe corresponds to the main mountain building phase and increased sediment flux in the retro-foreland Magallanes-Austral basin (~30-12 Ma) of the Patagonian Andes south of 47° S (Encinas et al, 2019;Folguera et al, 2018;Fosdick et al, 2011Fosdick et al, , 2013Ramos, 1989;Thomson et al, 2001).…”

Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

“…Although the early Neogene peaks might correspond to now-eroded early Miocene extrusive equivalents of the North Patagonian Batholith, the source of the Paleogene detrital zircons is less obvious. Paleogene magmatic rocks are found hundreds of km to the east in the Pilcaniyeu and El Maitén volcanic belts along the western edge of the North Patagonian Massif (e.g., Rapela et al, 1988;Iannelli et al, 2017; and, more restrictedly, tens of km east in the Alto Rio Císnes area (Prieto and Cortés, 1995;De la Cruz and Cortés, 2011) and the Meseta Guadal area (Encinas et al, 2019). These are potential sources for the Paleogene detrital zircons, however, the likely existence of an emerged ridge to the east of the basins, the immature nature of some of the protoliths and sedimentary rocks (e.g., the Queulat metaconglomerate and the La Junta Formation) and the occurrence of scattered Paleogene magmatic rocks along the LOFZ, all favour the possibility of a more local derivation, as discussed below.…”

“…These Eocene-early Miocene marine strata (Fig. 1) represent the climax and final stage of an extensional episode that started during the early Cenozoic (Aragón et al, 2011;Hervé et al, 2017;Encinas et al, 2019), following Lower and Upper Cretaceous orogenic phases (Gianni et al, 2018 and references therein).…”

Stratigraphy and Depositional Environments of the Santa Cruz Formation (Early-Middle Miocene) Along the Río Santa Cruz, Southern Patagonia, Argentina

“…1.2). It crops out along the foothills of the Andes from the Meseta Cosmelli in Aysén (Chile) (Ugalde et al, 2015;Encinas et al, 2019) and Lago Posadas regions (~400 and ~300 km to the northwest, respectively), where it is time equivalent to the Río Zeballos Group (Cuitiño et al, 2019;Aramendía et al, in press), and south of this area up to the Río Turbio region (~200 km to the southwest; Fig. 1.2).…”