Repeated eastward shifts of arc magmatism in the Southern Andes: A revision to the long-term pattern of Andean uplift and magmatism

Patagonian broken foreland and related synorogenic rifting: The origin of the Chubut Group Basin

“…4). In the Patagonian Andes Cretaceous arc migration had been previously attributed to a shallowing of the subducted slab (Barcat et al, 1989;Suárez et al, 2009a, Folguera andRamos, 2011). In this context, it is worth noting the close spatial and temporal relation between the broken foreland sector, the development of the Chubut Group Basin, the magmatic arc migration and the series of mid ocean ridge collisions ( Fig.4 and 14).…”

“…The 150-140 Ma extensional stage was dominated by three general structural trends: NNW (black lines), WNW (green lines) and minor E-W (red lines). Later, since ~120 Ma, a slab shallowing event is suggested by magmatic arc expansion at the time of development of a broad broken foreland.At this time compression reactivated the E-W and WNW structures of the San Jorge Gulf Basinin a syncontractional mode (modified fromFolguera and Ramos, 2011). B.…”

Caldera events in a rift depocentre: an example from the Jurassic Neuquén basin, Argentina

“…3). It is important to highlight that all of the tectonic structures described in this study are related to the synrift extension and that many of them were partially reactivated during the positive inversion (for reviews see Cooper & Williams 1989;McClay 1995) that occurred during Miocene time (Folguera & Ramos 2011), so extensional faults were reactivated in the opposite sense to their original movement, partially uplifting and deforming the synrift strata but preserving the original strike and dip. New faults that originated during the Andean orogeny were mapped, but they were not analysed in the study (Figs 2 and 3).…”

“…It is identifiable because its faulted margins were partially inverted and uplifted during the basin inversion ( Fig. 2a) that occurred in this part of the Andes mainly during Miocene time (Folguera & Ramos 2011), but that preserved its half-graben geometry (Fig. 2c).…”

Integrated diagenetic and sequence stratigraphy of a late Oligocene–early Miocene, mixed-sediment platform (Austral Basin, southern Patagonia): Resolving base-level and paleoceanographic changes, and paleoaquifer characteristics

“…1A) records, in part, development of the Patagonian fold-andthrust belt that began by the latest Cretaceous or early Paleogene, and transformed the basin from an early Mesozoic backarc basin to a retroarc foreland basin (Suárez et al, 2000). From the late Cretaceous through the late Miocene, progressive eastward migration of retroarc deformation resulted in uplift and volcanic-arc expansion (Thomson et al, 2001;Folguera and Ramos, 2011).…”