Mesozoic – Cenozoic evolution of the Southern Patagonian Andes fold and thrust belt (47°–48°S): Influence of the Rocas Verdes basin inversion and onset of Patagonian glaciations

Tectonic Subsidence Modeling of Diachronous Transition From Backarc to Retroarc Basin Development and Uplift During Cordilleran Orogenesis, Patagonian‐Fuegian Andes

“…Tectonic subsidence during the Late Cretaceous was most pronounced in the central sector. We note that whereas accelerated subsidence is not observed in the subsidence results at Lago Posadas (Figures 5c–5f and 6a), sediment provenance data, stratigraphic analysis, and structural data sets from this area indicate an Aptian transition to a retroarc foreland basin setting at this time (Barberón et al., 2019; Ghiglione et al., 2015; Ronda et al., 2019).…”

Northward propagation of Andean genesis: Insights from Early Cretaceous synorogenic deposits in the Aysén-Río Mayo basin

“…However, most recent studies in these same successions based on the anomaly of magnetic susceptibility (AMS) indicate that E-W contraction took place during deposition of these units (Ramos et al, 2016;Aramendía et al, 2018). Thus, the Aptian-Albian depocenters of the northern Austral basin were linked to the initial stage of Andean growth at those latitudes despite not presenting a clear Andean zircon provenance (Aramendía et al, 2018;Ronda et al, 2019).…”

“…The diachronic foreland basin deposition has been explained by the southward propagation of backarc closure of the preexisting Rocas Verdes basin (e.g. Malkowski et al, 2016;Ghiglione et al, 2016;Ronda et al, 2019).…”

Early Cretaceous to Cenozoic Growth of the Patagonian Andes as Revealed by Low‐Temperature Thermochronology

“…Contractional deformation is recorded in the FTB between 18 and 10 Ma by an angular unconformity between the Miocene Santa Cruz Fm. and Belgrano basalt flows and dikes (10.10 ± 0.32 Ma; Gorring et al., 1997) in the Sierra de Uñas area (Figure 3; Ramos, 1989; Ronda et al., 2019) and in the Meseta Lago Buenos Aires area (Figure 2; Guivel et al., 2006). In the Cosmelli basin (Figure 2) 23‐19 Ma sedimentary rocks (Encinas et al., 2019) have also been affected by contraction (Flint et al., 1994).…”

“…The increase in convergence rate between Nazca and South America plates after ∼28-25 Ma (Pardo-Casas & Molnar, 1987;Somoza & Ghidella, 2012), led to tectonic crustal thickening and the expansion of the foreland basin (Encinas et al, 2019;Ramos, 1989). Marine sediments of the El Chacay Formation and equivalents were deposited in the late Oligocene -early Miocene and were interpreted as the onset of flexural subsidence (Figure 2; Ramos, 1989;De la Cruz et al, 2004;Ronda et al, 2019) with locations of new and existing thermochronological samples. Samples with white contours are from previous datasets: Haschke et al, 2006;Thomson et al, 2001Thomson et al, , 2010Guillaume et al, 2013;Georgieva et al, 2016;Christeleit et al, 2017;Andrić-Tomašević et al, 2021.…”