The Fuegian thrust-fold belt: From arc-continent collision to thrust-related deformation in the southernmost Andes

Abstract

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Early rifting during marginal basin development: Petrography, microstructure, and detrital zircon U‐Pb geochronology of the Lapataia Formation, Argentine Fuegian Andes

“…The opening of the basin began in the Jurassic associated with the breakup of Gondwana, and its closure initiated in the Late Cretaceous, accompanying the onset of the Andean orogeny south of 50°S (present coordinates). This involved the obduction of the basin's oceanic floor and clastic fill towards the continent, and the collision of the volcanic arc that rimmed the southwestern margin of the basin (Bruhn, 1979; Calderón et al, 2012; Dalziel, 1986; Klepeis et al, 2010; Torres Carbonell et al, 2020; Figure 1b). Contraction continued with deep‐seated thrusting in the hinterland region, juxtaposing tectonic slices of a pre‐Jurassic continental basement and Jurassic to Cretaceous back‐arc basin strata (Calderón et al, 2012; Klepeis, 1994; Klepeis et al, 2010; Torres Carbonell et al, 2020).…”

“…CB, canal Beagle; CDMC, Cordillera Darwin Metamorphic Complex; CS, Cordillera Sarmiento; LF, Lago Fagnano. Adapted from Torres Carbonell et al (2020). Base geology compiled from Panza et al (2002), SERNAGEOMIN (2003), Olivero and Malumián (2008), Klepeis et al (2010), Torres Carbonell and Dimieri (2013).…”

“…Magmatic intrusions during both events are schematically represented. Adapted from Torres Carbonell et al (2020)…”

“…w, x, y, z are locations of geochronological data published by Hervé, Fanning, et al (2010) and Barbeau, Olivero, et al, 2009, displayed in Figure 8. Adapted from Torres Carbonell et al (2020). The extent of Jurassic exposures west of our study area (e.g.…”

Intraspecific Variability in the Early Miocene Struthiolariid Gastropod Perissodonta Ameghinoi (Ihering, 1897) From Tierra Del Fuego, Argentina

“…1; Biddle et al, 1986;Galeazzi, 1998;Olivero et al, 2002;Torres Carbonell & Olivero, 2019). The Austral and Malvinas foreland basins share a geologically similar sedimentary fill, which accumulated synchronously with several contractional stages following a major ductile deformation phase, associated with the closure and inversion of the predecessor Late Jurassic-Early Cretaceous Rocas Verdes back-arc basin (Dalziel, 1981;Torres Carbonell et al, 2020, and the bibliography therein). Within the thrust and fold belt, the Late Cretaceous to Oligocene-earliest Miocene foreland basin fill consists of three unconformity-bounded syntectonic clastic wedges of Late Cretaceous-Danian, Paleocene-early mid Eocene, and late mid Eocene-Oligocene-earliest Miocene age.…”