Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capitán Aracena, Carlos III, and Tortuga ophiolitic complexes

The closure of the Rocas Verdes Basin and early tectono-metamorphic evolution of the Magallanes Fold-and-Thrust Belt, southern Patagonian Andes (52–54°S)

“…150 Ma (Mukasa and Dalziel, 1996), similar to the northern Sarmiento Ophiolitic Complex (Calderón et al, 2007). The progressive widening of the RVB and development of mid-oceanridge type spreading centers was established in Tierra de Fuego even later, with the emplacement of the Tortuga Ophiolitic Complex between 130-120 Ma (Calderón et al, 2013). Therefore, the silicic magmatism within the RVB seems to have been episodic during the rift-related opening of the RVB controlled by inherited basement structures, and subsequent seafloor spreading in mid-ocean-ridge type centers to the south-west (Fig.…”

“…90-80 Ma (Fig. 1 A; Nelson et al, 1980;Hervé et al, 1984;Cunningham, 1995;Klepeis et al, 2010;Calderón et al, 2013).…”

Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

“…Reader is referred to the recent reviews published by Calderón et al (2013) and Malkowski et al (2015).…”

“…Deseado (De) and San Julián (SJu) basins afterFigueiredo et al (1996). Austral/Magallanes (Au) includes the Late Jurassic Rocas Verdes basin, ages afterPankhurst et al (2000) andCalderón et al (2013). Malvinas (Ma) afterGaleazzi (1998) andLovecchio et al (2019); North Malvinas (North Falkland) basin afterRamos et al (2017); andLohr and Underhill (2015).…”

Paleomagnetic Constraints From South Georgia on the Tectonic Reconstruction of the Early Cretaceous Rocas Verdes Marginal Basin System of Southernmost South America

“…This is the southernmost of a “string” of extensional basins that opened along the Andean continental margin of South America during the Late Jurassic to Early Cretaceous (Dalziel, 1986). It opened following a widespread rifting event accompanied by the extrusion of dominantly silicic volcanics known as the Tobifera Formation in Chile and the Lemaire Formation in Argentina (Bruhn et al., 1978) and is floored by extended continental basement and quasi‐oceanic to oceanic crust now preserved as ophiolitic complexes (Calderón et al., 2013; Dalziel, de Wit, & Palmer, 1974; Stern & de Wit, 2003). The basin is bordered on its Pacific side by a sliver of continental basement hosting the south Patagonian and Fuegian arc and underlying batholith.…”